JP4769783B2 - Method for producing supported fine particles - Google Patents
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- JP4769783B2 JP4769783B2 JP2007281355A JP2007281355A JP4769783B2 JP 4769783 B2 JP4769783 B2 JP 4769783B2 JP 2007281355 A JP2007281355 A JP 2007281355A JP 2007281355 A JP2007281355 A JP 2007281355A JP 4769783 B2 JP4769783 B2 JP 4769783B2
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- 239000010419 fine particle Substances 0.000 title claims description 137
- 238000004519 manufacturing process Methods 0.000 title claims description 31
- 239000002245 particle Substances 0.000 claims description 69
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 51
- 229910052799 carbon Inorganic materials 0.000 claims description 51
- 229910045601 alloy Inorganic materials 0.000 claims description 50
- 239000000956 alloy Substances 0.000 claims description 50
- 239000011148 porous material Substances 0.000 claims description 42
- 239000010409 thin film Substances 0.000 claims description 40
- 239000011882 ultra-fine particle Substances 0.000 claims description 39
- 239000000203 mixture Substances 0.000 claims description 32
- 239000003054 catalyst Substances 0.000 claims description 28
- 238000004544 sputter deposition Methods 0.000 claims description 25
- 239000000126 substance Substances 0.000 claims description 20
- 229910052707 ruthenium Inorganic materials 0.000 claims description 15
- 239000000446 fuel Substances 0.000 claims description 14
- 229910052697 platinum Inorganic materials 0.000 claims description 14
- 239000007772 electrode material Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229910052785 arsenic Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 229910052737 gold Inorganic materials 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 5
- 229910052741 iridium Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 239000011859 microparticle Substances 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910052763 palladium Inorganic materials 0.000 claims description 5
- 229910052702 rhenium Inorganic materials 0.000 claims description 5
- 229910052703 rhodium Inorganic materials 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 5
- 229910052718 tin Inorganic materials 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 229910052720 vanadium Inorganic materials 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical class 0.000 claims 1
- 229910002848 Pt–Ru Inorganic materials 0.000 description 25
- 238000000034 method Methods 0.000 description 22
- 229910052751 metal Inorganic materials 0.000 description 16
- 239000002184 metal Substances 0.000 description 16
- 238000007254 oxidation reaction Methods 0.000 description 15
- 238000001766 barrel sputter deposition Methods 0.000 description 14
- 230000007246 mechanism Effects 0.000 description 14
- 239000001257 hydrogen Substances 0.000 description 13
- 229910052739 hydrogen Inorganic materials 0.000 description 13
- 238000005259 measurement Methods 0.000 description 12
- 239000000843 powder Substances 0.000 description 12
- 230000003647 oxidation Effects 0.000 description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 150000002431 hydrogen Chemical class 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- 238000002484 cyclic voltammetry Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 150000002500 ions Chemical class 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 125000004429 atom Chemical group 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000000921 elemental analysis Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000005546 reactive sputtering Methods 0.000 description 3
- 238000005477 sputtering target Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910001260 Pt alloy Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 229920000557 Nafion® Polymers 0.000 description 1
- 230000010718 Oxidation Activity Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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- 239000011248 coating agent Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Description
本発明は、担持微粒子及びその製造方法に係わり、特に、表面に細孔を有する微粒子に超微粒子又は薄膜を担持する担持微粒子及びその製造方法に関する。 The present invention relates to a supported fine particle and a method for producing the same, and more particularly to a supported fine particle for carrying ultrafine particles or a thin film on fine particles having pores on the surface and a method for producing the same.
従来の担持微粒子の一例として燃料電池のアノード用電極触媒が挙げられる。このアノード用電極触媒には、Ｐｔ−Ｒｕ合金の使用が有力となっており、この電極触媒はウエットプロセスによって調製される。 An example of a conventional supported fine particle is an anode electrode catalyst for a fuel cell. As the anode electrode catalyst, use of a Pt—Ru alloy is dominant, and this electrode catalyst is prepared by a wet process.
図９（Ａ），（Ｂ）は、従来の燃料電池のアノード用電極触媒の調製方法の一例を説明する断面図である。
まず、図９（Ａ）に示すように、カーボン粒子１０１を準備する。このカーボン粒子１０１は、その表面に細孔１０２を有している。尚、図９ではカーボン粒子の一部の断面を示している。
次いで、前駆体であるＰｔとＲｕの錯イオン、例えば[Ｐｔ（ＮＨ３）４]２＋及び[Ｒｕ（ＮＨ３）６]３＋を含む溶液を準備する。次いで、この溶液をカーボン粒子１０１の細孔内に含浸させる。これにより、カーボン粒子１０１の細孔内にはＰｔとＲｕの錯イオンが担持される。
9A and 9B are cross-sectional views illustrating an example of a conventional method for preparing an anode electrode catalyst for a fuel cell.
First, as shown in FIG. 9A, carbon particles 101 are prepared. The carbon particles 101 have pores 102 on their surfaces. FIG. 9 shows a partial cross section of the carbon particles.
Next, a solution containing complex ions of precursors Pt and Ru, for example, [Pt (NH 3 ) 4 ] 2+ and [Ru (NH 3 ) 6 ] 3+ is prepared. Next, this solution is impregnated into the pores of the carbon particles 101. Thereby, complex ions of Pt and Ru are supported in the pores of the carbon particles 101.
この後、図９（Ｂ）に示すように、カーボン粒子１０１を水素雰囲気下で加熱還元する。これにより、前記錯イオンが還元され、カーボン粒子１０１の見掛け表面及び細孔内に様々な合金組成を有するＰｔ−Ｒｕ合金（予想した組成の合金以外にも例えばＰｔリッチな合金、Ｒｕリッチな合金等）が多数担持される。また、カーボン粒子の見掛け表面及び細孔内には還元されていないＰｔイオン（例えば[Ｐｔ（ＮＨ３）４]２＋）も存在する可能性もある。尚、ここでいうカーボン粒子の見掛け表面とは、細孔内表面を含むカーボン粒子の全表面から細孔内表面を除いたカーボン粒子の表面をいう。 Thereafter, as shown in FIG. 9B, the carbon particles 101 are heated and reduced in a hydrogen atmosphere. As a result, the complex ions are reduced, and Pt—Ru alloys having various alloy compositions in the apparent surfaces and pores of the carbon particles 101 (in addition to the alloys having the expected compositions, for example, Pt-rich alloys, Ru-rich alloys). Etc.) are carried in large numbers. In addition, there is a possibility that Pt ions (for example, [Pt (NH 3 ) 4 ] 2+ ) that are not reduced exist in the apparent surface and pores of the carbon particles. Here, the apparent surface of the carbon particles refers to the surface of the carbon particles obtained by removing the inner surface of the pores from the entire surface of the carbon particles including the inner surface of the pores.
上述した燃料電池のアノード用電極触媒には実用化に向けた課題がいくつかあるが、その一つとして調製コストが高いことが挙げられる。この課題を解決するには、Ｐｔ使用量を低減させること、電極調製工程を簡略化することが重要である。しかしながら、現在用いられているウエットプロセスでは、改良の糸口が見つからないため、改良指針も立てられない。従って、新たな電極触媒調製法を開発することが望まれている。 The above-mentioned anode electrode catalyst for fuel cells has several problems for practical use, and one of them is high preparation cost. In order to solve this problem, it is important to reduce the amount of Pt used and to simplify the electrode preparation process. However, in the wet process that is currently used, an improvement guideline cannot be established because an improvement clue cannot be found. Therefore, it is desired to develop a new electrode catalyst preparation method.
本発明は上記のような事情を考慮してなされたものであり、その目的は、従来と比べて担持する物質の使用量を少なくすることによりコストを低減させた担持微粒子及びその製造方法を提供することにある。また、本発明の他の目的は、従来と比べて簡略化したプロセスで微粒子に物質を担持することによりコストを低減させた担持微粒子の製造方法を提供することにある。 The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a supported fine particle whose cost is reduced by reducing the amount of a material to be supported as compared with the conventional method and a method for producing the same. There is to do. Another object of the present invention is to provide a method for producing supported fine particles, in which the cost is reduced by supporting a substance on the fine particles by a process that is simplified as compared with the prior art.
上記課題を解決するため、本発明に係る担持微粒子は、表面に細孔を有する微粒子と、
前記微粒子の見掛け表面に担持された、該微粒子より粒径の小さい超微粒子又は薄膜と、
を具備し、
前記超微粒子又は薄膜は、前記細孔内より前記微粒子の見掛け表面に多く担持されていることを特徴とする。
尚、見掛け表面とは、細孔内表面を含む微粒子の全表面から細孔内表面を除いた微粒子の表面をいう。
In order to solve the above problems, the supported fine particles according to the present invention include fine particles having pores on the surface,
An ultrafine particle or thin film having a particle diameter smaller than that of the fine particles supported on the apparent surface of the fine particles;
Comprising
The ultra fine particles or thin film is supported more on the apparent surface of the fine particles than in the pores.
The apparent surface refers to the surface of the fine particles obtained by removing the inner surface of the fine particles from the entire surface of the fine particles including the inner surface of the fine pores.
上記担持微粒子によれば、微粒子の見掛け表面に該微粒子より粒径の小さい超微粒子又は薄膜を担持する。そして、超微粒子又は薄膜を細孔内より見掛け表面に多く担持する。これにより、従来と比べて担持する物質の使用量を少なくすることができ、それにより担持微粒子のコストを低減させることができる。 According to the supported fine particles, ultrafine particles or thin films having a smaller particle diameter than the fine particles are supported on the apparent surface of the fine particles. Then, more ultrafine particles or thin films are supported on the apparent surface than in the pores. As a result, the amount of the substance to be supported can be reduced as compared with the conventional case, thereby reducing the cost of the supported fine particles.
本発明に係る担持微粒子は、表面に細孔を有する微粒子と、
前記微粒子の見掛け表面に選択的に担持された、該微粒子より粒径の小さい超微粒子又は薄膜と、
を具備し、
前記超微粒子又は薄膜が担持されていない前記細孔を有することを特徴とする。
The supported fine particles according to the present invention include fine particles having pores on the surface,
An ultrafine particle or thin film having a smaller particle diameter than the fine particles selectively supported on the apparent surface of the fine particles;
Comprising
It has the pores on which the ultrafine particles or thin film is not supported.
上記担持微粒子によれば、微粒子の見掛け表面に該微粒子より粒径の小さい超微粒子又は薄膜を担持する。そして、この担持微粒子は超微粒子又は薄膜が担持されていない細孔を有する。これにより、従来と比べて担持する物質の使用量を少なくすることができ、それにより担持微粒子のコストを低減させることができる。 According to the supported fine particles, ultrafine particles or thin films having a smaller particle diameter than the fine particles are supported on the apparent surface of the fine particles. The supported fine particles have pores on which ultrafine particles or thin films are not supported. As a result, the amount of the substance to be supported can be reduced as compared with the conventional case, thereby reducing the cost of the supported fine particles.
また、本発明に係る担持微粒子においては、前記微粒子が電気伝導性を有する物質、例えばカーボンからなることも可能である。また、本発明に係る担持微粒子において、前記超微粒子又は薄膜は、Ｐｔ単体、Ｐｔ系合金又はＰｔとの混合物からなることも可能である。
また、本発明に係る担持微粒子において、前記Ｐｔ系合金又はＰｔとの混合物は、Ｒｕ、Ｉｒ、Ｐｄ、Ｓｎ、Ｍｏ、Ｏｓ、Ｒｈ、Ｃｏ、Ｎｉ、Ａｇ、Ｔｉ、Ｖ、Ｃｒ、Ｍｎ、Ｇｅ、Ｆｅ、Ｒｅ、Ｗ、Ｚｎ、Ｃｕ、Ａｕ及びＡｓからなる群から選ばれた少なくとも一つとＰｔとの合金又は混合物であることも可能である。
また、本発明に係る担持微粒子において、前記Ｐｔとの混合物は、Ｒｕ、Ｉｒ、Ｐｄ、Ｓｎ、Ｍｏ、Ｏｓ、Ｒｈ、Ｃｏ、Ｎｉ、Ａｇ、Ｔｉ、Ｖ、Ｃｒ、Ｍｎ、Ｇｅ、Ｆｅ、Ｒｅ、Ｗ、Ｚｎ、Ｃｕ、Ａｕ及びＡｓからなる群から選ばれた少なくとも一つの金属の酸化物とＰｔとの混合物であることも可能である。
In the supported fine particles according to the present invention, the fine particles may be made of a material having electrical conductivity, such as carbon. Further, in the supported fine particles according to the present invention, the ultra fine particles or the thin film may be made of Pt alone, a Pt-based alloy or a mixture with Pt.
Further, in the supported fine particles according to the present invention, the Pt alloy or the mixture with Pt is Ru, Ir, Pd, Sn, Mo, Os, Rh, Co, Ni, Ag, Ti, V, Cr, Mn, Ge. It is also possible to be an alloy or a mixture of Pt and at least one selected from the group consisting of Fe, Re, W, Zn, Cu, Au and As.
In the supported fine particles according to the present invention, the mixture with Pt is Ru, Ir, Pd, Sn, Mo, Os, Rh, Co, Ni, Ag, Ti, V, Cr, Mn, Ge, Fe, Re. It is also possible to be a mixture of Pt with an oxide of at least one metal selected from the group consisting of W, Zn, Cu, Au and As.
また、本発明に係る担持微粒子は、内部の断面形状が多角形を有する真空容器を、前記断面に対してほぼ垂直方向を回転軸として回転させることにより、該真空容器内の微粒子を攪拌あるいは回転させながらスパッタリングを行うことで、該微粒子の見掛け表面に該微粒子より粒径の小さい超微粒子又は薄膜が担持されたことを特徴とする。 In addition, the supported fine particles according to the present invention are agitated or rotated by rotating a vacuum vessel having a polygonal cross-sectional shape about a rotation axis in a direction substantially perpendicular to the cross-section. Sputtering is performed, and ultrafine particles or a thin film having a smaller particle diameter than the fine particles are supported on the apparent surface of the fine particles.
また、本発明に係る担持微粒子は、内部の断面形状が多角形を有する真空容器を、前記断面に対してほぼ垂直方向を回転軸として回転させることにより、該真空容器内の微粒子を攪拌あるいは回転させると共に前記微粒子に振動を加えながらスパッタリングを行うことで、該微粒子の表面に該微粒子より粒径の小さい超微粒子又は薄膜が担持されたことを特徴とする。 In addition, the supported fine particles according to the present invention are agitated or rotated by rotating a vacuum vessel having a polygonal cross-sectional shape about a rotation axis in a direction substantially perpendicular to the cross-section. In addition, by performing sputtering while applying vibration to the fine particles, ultra fine particles or thin films having a smaller particle diameter than the fine particles are supported on the surfaces of the fine particles.
また、本発明に係る担持微粒子は、内部の断面形状が多角形を有する真空容器を直接または間接的に加熱すると共に、前記断面に対してほぼ垂直方向を回転軸として前記真空容器を回転させることにより、該真空容器内の微粒子を攪拌あるいは回転させながらスパッタリングを行うことで、該微粒子の表面に該微粒子より粒径の小さい超微粒子又は薄膜が担持されたことを特徴とする。 In addition, the supported fine particles according to the present invention directly or indirectly heat a vacuum vessel having an internal cross-sectional shape of a polygon, and rotate the vacuum vessel about a direction substantially perpendicular to the cross-section. Thus, by performing sputtering while stirring or rotating the fine particles in the vacuum vessel, ultra fine particles or thin films having a smaller particle diameter than the fine particles are supported on the surfaces of the fine particles.
また、本発明に係る担持微粒子は、１次電池の電極触媒、２次電池の電極触媒、燃料電池の電極触媒、１次電池の電極材料、２次電池の電極材料、及び燃料電池の電極材料のうち少なくとも一つに用いられることも可能である。
尚、本発明に係る担持微粒子はスパッタリング法により製造することが好ましいが、スパッタリング法に限定されるものではなく、他のドライプロセス法、例えば蒸着法、ＣＶＤ(chemical vapor deposition)法により製造することも可能である。
The supported fine particles according to the present invention include an electrode catalyst for a primary battery, an electrode catalyst for a secondary battery, an electrode catalyst for a fuel cell, an electrode material for a primary battery, an electrode material for a secondary battery, and an electrode material for a fuel cell. It is also possible to use it for at least one of them.
The supported fine particles according to the present invention are preferably produced by a sputtering method, but are not limited to the sputtering method, and may be produced by other dry process methods such as a vapor deposition method and a CVD (chemical vapor deposition) method. Is also possible.
本発明に係る担持微粒子の製造方法は、重力方向に対してほぼ平行な断面の内部形状が多角形である真空容器内に、表面に細孔を有する微粒子を収容し、
前記断面に対してほぼ垂直方向を回転軸として前記真空容器を回転させることにより該真空容器内の微粒子を攪拌あるいは回転させながらスパッタリングを行うことで、該微粒子の見掛け表面に該微粒子より粒径の小さい超微粒子又は薄膜を担持することを特徴とする。
上記担持微粒子の製造方法によれば、従来と比べて簡略化したプロセスで微粒子に物質を担持することができ、それによりコストを低減することができる。
The method for producing the supported fine particles according to the present invention accommodates fine particles having pores on the surface in a vacuum container having a polygonal internal shape of a cross section substantially parallel to the direction of gravity,
Sputtering is performed while stirring or rotating the fine particles in the vacuum vessel by rotating the vacuum vessel about a direction substantially perpendicular to the cross section as a rotation axis, so that the apparent surface of the fine particles has a particle size smaller than that of the fine particles. It is characterized by carrying small ultrafine particles or thin films.
According to the method for producing the supported fine particles, the substance can be supported on the fine particles by a process that is simplified as compared with the conventional method, thereby reducing the cost.
本発明に係る担持微粒子の製造方法は、内部の断面形状が多角形を有する真空容器内に、表面に細孔を有する微粒子を収容し、
前記微粒子に振動を加えると共に前記断面に対してほぼ垂直方向を回転軸として前記真空容器を回転させることにより該真空容器内の微粒子を攪拌あるいは回転させながらスパッタリングを行うことで、該微粒子の見掛け表面に該微粒子より粒径の小さい超微粒子又は薄膜を担持することを特徴とする。
The method for producing the supported fine particles according to the present invention contains fine particles having pores on the surface in a vacuum container having a polygonal cross-sectional shape,
The apparent surface of the fine particles is sputtered while the fine particles in the vacuum vessel are stirred or rotated by applying vibration to the fine particles and rotating the vacuum vessel about a direction substantially perpendicular to the cross section. Further, ultrafine particles or a thin film having a particle diameter smaller than that of the fine particles are supported.
本発明に係る担持微粒子の製造方法は、内部の断面形状が多角形を有する真空容器内に、表面に細孔を有する微粒子を収容し、
前記真空容器を加熱すると共に前記断面に対してほぼ垂直方向を回転軸として前記真空容器を回転させることにより該真空容器内の微粒子を攪拌あるいは回転させながらスパッタリングを行うことで、該微粒子の見掛け表面に該微粒子より粒径の小さい超微粒子又は薄膜を担持することを特徴とする。
The method for producing the supported fine particles according to the present invention contains fine particles having pores on the surface in a vacuum container having a polygonal cross-sectional shape,
The apparent surface of the fine particles by sputtering while heating or vacuuming the fine particles in the vacuum vessel by heating the vacuum vessel and rotating the vacuum vessel about a direction substantially perpendicular to the cross section. Further, ultrafine particles or a thin film having a particle diameter smaller than that of the fine particles are supported.
また、本発明に係る担持微粒子の製造方法において、前記超微粒子又は薄膜は、前記細孔内より前記微粒子の見掛け表面に多く担持されていることが好ましい。
また、本発明に係る担持微粒子の製造方法においては、前記超微粒子又は薄膜が担持されていない前記細孔を有することが好ましい。
In the method for producing supported fine particles according to the present invention, it is preferable that a larger amount of the ultrafine particles or thin film is supported on the apparent surface of the fine particles than in the pores.
Moreover, in the manufacturing method of the carrying | support particle | grains which concern on this invention, it is preferable to have the said pore by which the said ultrafine particle or thin film is not carry | supported.
以上説明したように本発明によれば、従来と比べて担持する物質の使用量を少なくすることによりコストを低減させた担持微粒子及びその製造方法を提供することができる。また、他の本発明によれば、従来と比べて簡略化したプロセスで微粒子に物質を担持することによりコストを低減させた担持微粒子の製造方法を提供することができる。 As described above, according to the present invention, it is possible to provide supported fine particles whose cost is reduced by reducing the amount of a substance to be supported as compared with the prior art and a method for manufacturing the same. In addition, according to another aspect of the present invention, it is possible to provide a method for producing supported fine particles in which the cost is reduced by supporting a substance on the fine particles by a process that is simplified as compared with the prior art.
以下、図面を参照して本発明の実施形態について説明する。
図１（Ａ）〜（Ｃ）は、本発明に係る実施の形態による担持微粒子の製造方法を説明する断面図である。
図２は、図１に示す担持微粒子を製造する際に用いる多角バレルスパッタ装置の概略を示す構成図である。
この多角バレルスパッタ装置は、表面に細孔を有する微粒子（粉体）の見掛け表面に、該微粒子より粒径の小さい超微粒子又は薄膜を担持するための装置である。尚、見掛け表面とは、細孔内表面を含む微粒子の全表面から細孔内表面を除いた微粒子の表面をいう。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1A to 1C are cross-sectional views illustrating a method for producing supported fine particles according to an embodiment of the present invention.
FIG. 2 is a configuration diagram showing an outline of a polygonal barrel sputtering apparatus used when the supported fine particles shown in FIG. 1 are manufactured.
This polygonal barrel sputtering apparatus is an apparatus for carrying ultrafine particles or a thin film having a particle diameter smaller than the fine particles on the apparent surface of fine particles (powder) having pores on the surface. The apparent surface refers to the surface of the fine particles obtained by removing the inner surface of the fine particles from the entire surface of the fine particles including the inner surface of the fine pores.
まず、図２に示す多角バレルスパッタ装置について説明する。
多角バレルスパッタ装置は、微粒子３に超微粒子又は薄膜を被覆させる真空容器１を有しており、この真空容器１は直径２００ｍｍの円筒部１ａとその内部に設置された断面が六角形のバレル（六角型バレル）１ｂとを備えている。ここで示す断面は、重力方向に対してほぼ平行な断面である。なお、本実施の形態では、六角形のバレル１ｂを用いているが、これに限定されるものではなく、六角形以外の多角形のバレル（例えば４〜１２角形）を用いることも可能である。
First, the polygon barrel sputtering apparatus shown in FIG. 2 will be described.
The polygonal barrel sputtering apparatus has a vacuum vessel 1 for coating fine particles 3 with ultrafine particles or a thin film. The vacuum vessel 1 has a cylindrical portion 1a having a diameter of 200 mm and a hexagonal barrel ( Hexagonal barrel) 1b. The cross section shown here is a cross section substantially parallel to the direction of gravity. In the present embodiment, the hexagonal barrel 1b is used. However, the present invention is not limited to this, and a polygonal barrel other than the hexagon (for example, 4 to 12 squares) can be used. .
真空容器１には回転機構（図示せず）が設けられており、この回転機構により六角型バレル１ｂを矢印のように回転または反転させたり、或いは振り子のように揺することで該六角型バレル１ｂ内の微粒子３を攪拌あるいは回転させながら被覆処理を行うものである。前記回転機構により六角型バレルを回転させる際の回転軸は、ほぼ水平方向（重力方向に対して垂直方向）に平行な軸である。また、真空容器１内には円筒の中心軸上に触媒作用を有する物質、またはこの物質を反応性スパッタリングで作り出すことができる物質からなるスパッタリングターゲット２が配置されており、このターゲット２は角度を自由に変えられるように構成されている。これにより、六角型バレル１ｂを回転または反転させたり、或いは振り子のように揺すりながら被覆処理を行う時、ターゲット２を微粒子３の位置する方向に向けることができ、それによってスパッタ効率を上げることが可能となる。 The vacuum vessel 1 is provided with a rotating mechanism (not shown). By rotating or reversing the hexagonal barrel 1b as indicated by an arrow or shaking like a pendulum by the rotating mechanism, the hexagonal barrel 1b is provided. The coating process is performed while stirring or rotating the fine particles 3 therein. A rotation axis when the hexagonal barrel is rotated by the rotation mechanism is an axis substantially parallel to the horizontal direction (perpendicular to the gravity direction). In addition, a sputtering target 2 made of a substance having a catalytic action on the central axis of the cylinder or a substance capable of producing this substance by reactive sputtering is disposed in the vacuum vessel 1, and the target 2 has an angle. It is configured to be freely changed. Accordingly, when the coating process is performed while rotating or reversing the hexagonal barrel 1b or shaking like a pendulum, the target 2 can be directed in the direction in which the fine particles 3 are located, thereby increasing the sputtering efficiency. It becomes possible.
ターゲット２を構成する物質は、Ｐｔ単体、Ｐｔ系合金又はＰｔとの混合物であることが好ましい。Ｐｔ系合金又はＰｔとの混合物は、例えばＲｕ、Ｉｒ、Ｐｄ、Ｓｎ、Ｍｏ、Ｏｓ、Ｒｈ、Ｃｏ、Ｎｉ、Ａｇ、Ｔｉ、Ｖ、Ｃｒ、Ｍｎ、Ｇｅ、Ｆｅ、Ｒｅ、Ｗ、Ｚｎ、Ｃｕ、Ａｕ及びＡｓからなる金属群から選ばれた少なくとも一つの金属とＰｔとの合金（２元以上の合金）又は混合物が挙げられる。また、前記金属群から選ばれた複数の金属とＰｔとの混合物によってターゲット２を構成することも可能である。また、前記金属群から選ばれた少なくとも一つの金属の酸化物とＰｔとの混合物が挙げられる。また真空容器１内に配置されるターゲット２はＰｔと他の一種類でもよいが複数種類であってもよい。例えばターゲット２として、Ｐｔと上記した金属群から選ばれた複数の金属それぞれからなる複数のターゲットを並べて配置してもよい。また、Ｐｔターゲットと上記した金属群から選ばれた一つの金属からなるターゲットと、上記した金属群に含まれる金属の酸化物からなるターゲットとを並べて配置してもよい。 The substance constituting the target 2 is preferably Pt alone, a Pt alloy, or a mixture with Pt. Pt-based alloys or mixtures with Pt are, for example, Ru, Ir, Pd, Sn, Mo, Os, Rh, Co, Ni, Ag, Ti, V, Cr, Mn, Ge, Fe, Re, W, Zn, Cu , An alloy (a binary or higher alloy) or a mixture of at least one metal selected from the metal group consisting of Au and As and Pt. It is also possible to configure the target 2 with a mixture of a plurality of metals selected from the metal group and Pt. Moreover, the mixture of the oxide and Pt of the at least 1 metal chosen from the said metal group is mentioned. Further, the target 2 arranged in the vacuum vessel 1 may be Pt or another type, but may be a plurality of types. For example, as the target 2, a plurality of targets each made of Pt and a plurality of metals selected from the above metal group may be arranged side by side. Further, a target made of one metal selected from the Pt target and the above metal group and a target made of an oxide of a metal contained in the above metal group may be arranged side by side.
そして、微粒子３を被覆する物質は、例えばターゲット２を構成する物質である。ターゲット２が複数種類ある場合はこれらの混合物または合金である。またターゲット２が上記した金属群から選ばれた一もしくは複数の金属の混合物または合金から構成されており、かつ反応性スパッタリングが行われる場合、微粒子３を被覆する物質はターゲット２を構成する物質から生成した物質（例えば酸化物）またはこれとターゲット２を構成する物質の混合物である。 And the substance which coat | covers the microparticles | fine-particles 3 is a substance which comprises the target 2, for example. When there are a plurality of types of targets 2, these are mixtures or alloys thereof. In addition, when the target 2 is made of a mixture or alloy of one or more metals selected from the above metal group and reactive sputtering is performed, the substance that coats the fine particles 3 is made from the substance that constitutes the target 2. The generated substance (for example, oxide) or a mixture of the substance and the substance constituting the target 2.
真空容器１には配管４の一端が接続されており、この配管４の他端には第１バルブ１２の一方側が接続されている。第１バルブ１２の他方側は配管５の一端が接続されており、配管５の他端はターボ分子ポンプ（ＴＭＰ）１０の吸気側に接続されている。ターボ分子ポンプ１０の排気側は配管６の一端に接続されており、配管６の他端は第２バルブ１３の一方側に接続されている。第２バルブ１３の他方側は配管７の一端に接続されており、配管７の他端はポンプ（ＲＰ）１１に接続されている。また、配管４は配管８の一端に接続されており、配管８の他端は第３バルブ１４の一方側に接続されている。第３バルブ１４の他方側は配管９の一端に接続されており、配管９の他端は配管７に接続されている。 One end of a pipe 4 is connected to the vacuum vessel 1, and one side of the first valve 12 is connected to the other end of the pipe 4. One end of the pipe 5 is connected to the other side of the first valve 12, and the other end of the pipe 5 is connected to the intake side of the turbo molecular pump (TMP) 10. The exhaust side of the turbo molecular pump 10 is connected to one end of the pipe 6, and the other end of the pipe 6 is connected to one side of the second valve 13. The other side of the second valve 13 is connected to one end of the pipe 7, and the other end of the pipe 7 is connected to the pump (RP) 11. The pipe 4 is connected to one end of the pipe 8, and the other end of the pipe 8 is connected to one side of the third valve 14. The other side of the third valve 14 is connected to one end of the pipe 9, and the other end of the pipe 9 is connected to the pipe 7.
本装置は、真空容器１内の微粒子３を直接加熱するためのヒータ１７ａと、間接的に加熱するためのヒータ１７ｂを備えている。また、本装置は、真空容器１内の微粒子３に振動を加えるためのバイブレータ１８を備えている。また、本装置は、真空容器１の内部圧力を測定する圧力計１９を備えている。また、本装置は、真空容器１内に窒素ガスを導入する窒素ガス導入機構１５を備えていると共に真空容器１内にアルゴンガスを導入するアルゴンガス導入機構１６を備えている。また反応性スパッタリングを行えるように、酸素等を導入できるガス導入機構２０も備えている。また、本装置は、ターゲット２と六角型バレル１ｂとの間に高周波を印加する高周波印加機構（図示せず）を備えている。尚、ターゲット２と六角型バレル１ｂとの間には直流も印加できるようになっている。 This apparatus includes a heater 17a for directly heating the fine particles 3 in the vacuum vessel 1 and a heater 17b for indirectly heating. In addition, this apparatus includes a vibrator 18 for applying vibration to the fine particles 3 in the vacuum vessel 1. The apparatus also includes a pressure gauge 19 that measures the internal pressure of the vacuum vessel 1. In addition, the apparatus includes a nitrogen gas introduction mechanism 15 that introduces nitrogen gas into the vacuum vessel 1 and an argon gas introduction mechanism 16 that introduces argon gas into the vacuum vessel 1. Moreover, the gas introduction mechanism 20 which can introduce | transduce oxygen etc. is also provided so that reactive sputtering can be performed. In addition, this apparatus includes a high frequency application mechanism (not shown) that applies a high frequency between the target 2 and the hexagonal barrel 1b. A direct current can also be applied between the target 2 and the hexagonal barrel 1b.
次に、上記多角バレルスパッタ装置を用いて、微粒子３の見掛け表面に超微粒子又は薄膜を担持する担持微粒子の製造方法について説明する。 Next, a description will be given of a method for producing supported fine particles in which ultrafine particles or thin films are supported on the apparent surface of the fine particles 3 using the polygon barrel sputtering apparatus.
まず、図１（Ａ）に示す微粒子３の一例としてカーボン粒子を準備する。このカーボン粒子３は、その表面に細孔２１を有している。尚、図１（Ａ）ではカーボン粒子の一部の断面を示している。
次いで、図２に示す多角バレルスパッタ装置を用いて図１（Ａ）に示すカーボン粒子３の見掛け表面にＰｔ−Ｒｕ合金からなる超微粒子又は薄膜をスパッタリングにより担持させる。尚、見掛け表面とは、細孔内表面を含むカーボン粒子の全表面から細孔内表面を除いたカーボン粒子の表面をいう。
First, carbon particles are prepared as an example of the fine particles 3 shown in FIG. The carbon particles 3 have pores 21 on their surfaces. FIG. 1A shows a partial cross section of the carbon particles.
Next, ultrafine particles or a thin film made of a Pt—Ru alloy is supported on the apparent surface of the carbon particles 3 shown in FIG. 1A by sputtering using a polygonal barrel sputtering apparatus shown in FIG. The apparent surface refers to the surface of the carbon particle obtained by removing the inner surface of the pore from the entire surface of the carbon particle including the inner surface of the pore.
以下、詳細に説明する。
まず、六角型バレル１ｂ内に例えば６グラムのカーボン粒子３を導入する。このカーボン粒子３としては例えば１０〜２０μｍの大きさの導電性カーボン粉体を用いるが、これに限定されるものではなく、他の導電性材料、例えば金属粉末、高分子粉末、酸化物粉末、窒化物粉末又は炭化物粉末を用いることも可能である。本多角バレルスパッタ方法を用いれば、幅広い材料粉体に、触媒作用を有する物質からなる超微粒子又は薄膜を被覆することが可能である。
Details will be described below.
First, for example, 6 grams of carbon particles 3 are introduced into the hexagonal barrel 1b. The carbon particles 3 are, for example, conductive carbon powder having a size of 10 to 20 μm, but are not limited thereto, and other conductive materials such as metal powder, polymer powder, oxide powder, It is also possible to use nitride powder or carbide powder. If this polygonal barrel sputtering method is used, it is possible to coat a wide range of material powders with ultrafine particles or thin films made of a substance having a catalytic action.
次いで、ターボ分子ポンプ１０を用いて六角型バレル１ｂ内に高真空状態を作り、ヒータ１７で六角型バレルを例えば３００℃まで加熱しながら、六角型バレル内を例えば１×１０−５Ｐａに減圧する。その後、アルゴンガス導入機構１６又は窒素ガス導入機構１５によりアルゴン又は窒素などの不活性ガスを六角型バレル１ｂ内に導入する。この際の六角型バレル内の圧力は例えば０．１〜２Ｐａ程度である。場合によっては酸素、窒素、メタンまたは水素との混合ガスを六角型バレル１ｂ内に導入しても良い。そして、回転機構により六角型バレル１ｂを１００ Ｗで３０分間、２０ｒｐｍで回転させることで、六角型バレル１ｂ内のカーボン粒子３を回転させ、攪拌させる。その際、スパッタリングターゲット２はカーボン粒子３の位置する方向に向けられる。スパッタリングターゲット２にはＰｔ及びＲｕターゲットを同時に用い、ターゲットカバーを調整して、Ｐｔ：Ｒｕのスパッタリング比が５２：４８となるように設定する。 Next, the turbo molecular pump 10 is used to create a high vacuum state in the hexagonal barrel 1b, and the hexagonal barrel is depressurized to 1 × 10 −5 Pa, for example, while the hexagonal barrel is heated to, for example, 300 ° C. by the heater 17. To do. Thereafter, an inert gas such as argon or nitrogen is introduced into the hexagonal barrel 1b by the argon gas introduction mechanism 16 or the nitrogen gas introduction mechanism 15. The pressure in the hexagonal barrel at this time is, for example, about 0.1 to 2 Pa. In some cases, a mixed gas of oxygen, nitrogen, methane, or hydrogen may be introduced into the hexagonal barrel 1b. And the carbon particle 3 in the hexagonal barrel 1b is rotated and agitated by rotating the hexagonal barrel 1b at 100 W for 30 minutes at 20 rpm by the rotation mechanism. At that time, the sputtering target 2 is directed in the direction in which the carbon particles 3 are located. Pt and Ru targets are simultaneously used for the sputtering target 2 and the target cover is adjusted so that the sputtering ratio of Pt: Ru is 52:48.
その後、高周波印加機構によりターゲット２と六角型バレル１ｂとの間に高周波を印加することで、図１（Ｂ）に示すように、カーボン粒子３の見掛け表面にＰｔ及びＲｕをスパッタリングする。これにより、図１（Ｃ）に示すように、カーボン粒子３の見掛け表面にほぼ均一な合金組成を有するＰｔ−Ｒｕ合金からなる超微粒子又は薄膜が担持される。但し、前記超微粒子又は薄膜が細孔内には担持されないか、担持されたとしてもその量は少ない。 Thereafter, a high frequency is applied between the target 2 and the hexagonal barrel 1b by a high frequency application mechanism to sputter Pt and Ru on the apparent surface of the carbon particles 3 as shown in FIG. As a result, as shown in FIG. 1C, ultrafine particles or a thin film made of a Pt—Ru alloy having a substantially uniform alloy composition is supported on the apparent surface of the carbon particles 3. However, even if the ultrafine particles or thin film is not supported in the pores or is supported, the amount is small.
上記実施の形態によれば、六角型バレル自体を回転させることで粉体自体を回転させ攪拌でき、更にバレルを六角型とすることにより、粉体を重力により定期的に落下させることができる。このため、攪拌効率を飛躍的に向上させることができ、粉体を扱う時にしばしば問題となる水分や静電気力による粉体の凝集を防ぐことができる。つまり回転により攪拌と、凝集した粉体の粉砕を同時かつ効果的に行うことができる。また六角型バレル１ｂ壁面に微粒子が付着しにくくなる。従って、粒径の非常に小さいカーボン粒子に、Ｐｔ−Ｒｕ合金からなる該カーボン粒子より粒径が更に小さい超微粒子又は薄膜を担持することが可能となる。具体的には、粒径が５ｎｍ以上１ｍｍ以下のカーボン粒子に、Ｐｔ−Ｒｕ合金からなる超微粒子又は薄膜を被覆することが可能となる。ここで薄膜及び超微粒子に含まれる不純物は従来方法で調製された触媒と比べて極めて少ないか、またはない。尚、超微粒子は、連続的にカーボン粒子の表面に付着する場合もあるし、単体又は集合体として不連続にカーボン粒子の表面に付着する場合もある。 According to the above embodiment, the powder itself can be rotated and stirred by rotating the hexagonal barrel itself, and further, the powder can be periodically dropped by gravity by making the barrel hexagonal. For this reason, the stirring efficiency can be dramatically improved, and aggregation of the powder due to moisture or electrostatic force, which is often a problem when handling the powder, can be prevented. That is, stirring by rotation and pulverization of the agglomerated powder can be performed simultaneously and effectively. Moreover, it becomes difficult for fine particles to adhere to the wall surface of the hexagonal barrel 1b. Accordingly, it is possible to carry ultrafine particles or a thin film having a particle diameter much smaller than that of the carbon particles made of a Pt—Ru alloy on carbon particles having a very small particle diameter. Specifically, it is possible to coat carbon particles having a particle size of 5 nm or more and 1 mm or less with ultrafine particles or a thin film made of a Pt—Ru alloy. Here, the impurities contained in the thin film and the ultrafine particles are very little or not as compared with the catalyst prepared by the conventional method. In addition, the ultrafine particles may adhere to the surface of the carbon particles continuously, or may adhere to the surface of the carbon particles discontinuously as a single body or an aggregate.
また、本実施の形態では、カーボン粒子３の見掛け表面にＰｔ−Ｒｕ合金を一段階でほぼ均一に担持（又は修飾）させることができるので、従来技術に比べて製造工程を簡略化することができる。従って、担持微粒子の製造コストを低減することができる。 Further, in the present embodiment, the Pt—Ru alloy can be supported (or modified) almost uniformly on the apparent surface of the carbon particles 3 in one step, so that the manufacturing process can be simplified as compared with the prior art. it can. Therefore, the manufacturing cost of the supported fine particles can be reduced.
また、従来技術では、カーボン粒子の細孔内に多量のＰｔ及びＲｕが担持されるのに対し、本実施の形態では、カーボン粒子の細孔内に担持されるＰｔ及びＲｕの量を少なくすることができる。これにより、従来の燃料電池のアノード用電極触媒と同等の機能を発揮させるのにＰｔ−Ｒｕ合金の担持量を非常に少なくすることが可能となる。即ち、Ｐｔ−Ｒｕ合金の担持量を非常に少なくしても従来と同等の機能を発揮させることができる。従って、従来と比べて担持するＰｔの使用量を少なくすることができ、それによりコストの低減を実現することができる。燃料電池のアノード用電極触媒に限定されるものではなく、カソード触媒や他の電極触媒にも同様なことが言える。 In the prior art, a large amount of Pt and Ru are supported in the pores of the carbon particles, whereas in this embodiment, the amount of Pt and Ru supported in the pores of the carbon particles is reduced. be able to. As a result, the amount of the Pt—Ru alloy supported can be extremely reduced in order to perform the same function as the anode electrode catalyst of the conventional fuel cell. That is, even if the amount of the Pt—Ru alloy supported is very small, the function equivalent to the conventional one can be exhibited. Therefore, it is possible to reduce the amount of Pt to be carried as compared with the conventional case, thereby realizing cost reduction. The present invention is not limited to anode catalysts for fuel cells, and the same applies to cathode catalysts and other electrode catalysts.
上記の効果を確認するために、多角バレルスパッタ装置を用いてＰｔ−Ｒｕ合金を担持したカーボン粒子の電気化学挙動について実験したので、その結果について説明する。 In order to confirm the above effect, an experiment was conducted on the electrochemical behavior of carbon particles carrying a Pt—Ru alloy using a polygonal barrel sputtering apparatus, and the results will be described.
まず、図２に示す多角バレルスパッタ装置を用いて、前述した方法でカーボン粒子にＰｔ−Ｒｔ合金を担持した調製試料を準備した。ここで用いたカーボン粒子は、市販のカーボン粉末（三菱化学製の♯３２３０Ｂ）であり、その見掛けの平均粒径は１０〜２０μｍであった。ここで用いたスパッタリング条件は、高周波電源出力が１００Ｗ、Ａｒ流量が３０ｓｃｃｍ、カーボン粒子の温度が３５０℃であった。なお、見掛けの平均粒径とは、顕微鏡で観測した時の集合体（２次粒子）の大きさであり、１次粒子の大きさは１０〜３０ｎｍである。また、本実施の形態の調製試料と比較するために、市販のＰｔ５０原子％（ａｔ．％）触媒を市販試料として準備すると共に、スパッタリングによりＳｉＯ２ガラス板上にＰｔ−Ｒｕ合金膜を成膜した試料を準備した。 First, using a polygonal barrel sputtering apparatus shown in FIG. 2, a prepared sample in which a Pt—Rt alloy was supported on carbon particles by the method described above was prepared. The carbon particles used here were commercially available carbon powder (# 3230B manufactured by Mitsubishi Chemical Corporation), and the apparent average particle diameter was 10 to 20 μm. The sputtering conditions used here were a high frequency power output of 100 W, an Ar flow rate of 30 sccm, and a carbon particle temperature of 350 ° C. The apparent average particle diameter is the size of the aggregate (secondary particles) when observed with a microscope, and the size of the primary particles is 10 to 30 nm. For comparison with the prepared sample of the present embodiment, a commercially available Pt50 atomic% (at.%) Catalyst is prepared as a commercially available sample, and a Pt—Ru alloy film is formed on the SiO 2 glass plate by sputtering. A prepared sample was prepared.
図３は、ＳｉＯ２ガラス板上のＰｔ−Ｒｕ合金試料（ａ）、調製試料（ｂ）及び市販試料（ｃ）それぞれのＸ線回折（ＸＲＤ）パターンを測定した結果を示す図である。
この図によれば、調製試料と市販試料の両者とも１本のピークのみ認められているが、調製試料の方が明らかに形状がシャープになっていることがわかる。これは、調製試料の方がより均一な合金組成で担持（修飾）されていることを示している。尚、スパッタリング条件の検討のために調製したＳｉＯ２ガラス板上のＰｔ−Ｒｕ合金試料に比べると半値幅がまだ大きくなっているが、スパッタリング条件をさらに調整することにより、調製試料の半値幅を小さくすることは可能である。
FIG. 3 is a diagram showing the results of measuring the X-ray diffraction (XRD) patterns of the Pt—Ru alloy sample (a), the prepared sample (b), and the commercial sample (c) on the SiO 2 glass plate.
According to this figure, only one peak is recognized in both the prepared sample and the commercially available sample, but it can be seen that the shape of the prepared sample is clearly sharper. This indicates that the prepared sample is supported (modified) with a more uniform alloy composition. In addition, although the half width is still larger than the Pt-Ru alloy sample on the SiO 2 glass plate prepared for the examination of the sputtering conditions, the half width of the prepared sample can be reduced by further adjusting the sputtering conditions. It is possible to make it smaller.
図３に示すＸＲＤピーク位置と合金組成は、市販試料が４０．２１°、調製試料が４０．３３°であり、両者には違いが認められた。図４は、調製試料及び市販試料それぞれのピーク位置と合金組成について、アーク溶解試料から作成した基準となるピーク位置と合金組成比とを比較した図である。この図により、調製試料及び市販試料それぞれのＰｔ含有量を求めた。 The XRD peak position and alloy composition shown in FIG. 3 were 40.21 ° for the commercial sample and 40.33 ° for the prepared sample, and a difference was observed between the two. FIG. 4 is a diagram comparing the peak position and the alloy composition ratio as a reference created from the arc melting sample with respect to the peak position and the alloy composition of each of the prepared sample and the commercial sample. From this figure, the Pt content of each of the prepared sample and the commercial sample was determined.
アーク溶解試料としては、田中貴金属製のＰｔ（純度９９．９％）、Ｒｕ（純度９９．９％）を用意し、Ｐｔ組成が５０原子％、７０原子％、９０原子％になるように調製したＰｔ−Ｒｕ合金を使用した。このアーク溶解試料をＸＲＤ測定し、この測定結果を基準としてピーク位置と合金組成を比較した。
図４によれば、市販試料は、そのピーク位置が４０．２１°であることから６８．８原子％と求められ、言われている５０原子％とは異なっていた。一方、調製試料は、そのピーク位置が４０．３１°であることから６０．３原子％と求められ、前述したスパッタリング比５２原子％に近い値となっていた。
As the arc melting sample, Tanaka Kikinzoku Pt (purity 99.9%) and Ru (purity 99.9%) are prepared and prepared so that the Pt composition is 50 atomic%, 70 atomic%, and 90 atomic%. The Pt—Ru alloy used was used. This arc melting sample was subjected to XRD measurement, and the peak position and the alloy composition were compared based on the measurement result.
According to FIG. 4, the commercially available sample was found to be 68.8 atomic% because its peak position was 40.21 °, and was different from the 50 atomic% which is said. On the other hand, since the peak position of the prepared sample was 40.31 °, it was determined to be 60.3 atomic%, which was close to the above-described sputtering ratio of 52 atomic%.
図５は、スパッタリング前のカーボン粒子及びＰｔ−Ｒｕ合金を担持した調製試料（担持微粒子）それぞれをＳＥＭ（倍率５０００倍）により観察した写真及びＥＤＳによりＣ、Ｐｔ、Ｒｕの元素分析した元素マッピングを示す図である。 FIG. 5 shows a photograph obtained by observing a prepared sample (supported fine particles) supporting carbon particles and a Pt—Ru alloy before sputtering with SEM (5000 times magnification) and element mapping of elemental analysis of C, Pt, and Ru by EDS. FIG.
図５では、ＳＥＭ像からスパッタリング前のカーボン粒子とスパッタリング後の担持微粒子の表面に大きな違いは認められなかったが、ＥＤＳ測定から、スパッタリング前のカーボン粒子には検出されないＰｔ元素、Ｒｕ元素がどちらも担持微粒子の表面にほぼ均一に担持されていることが認められた。このことから、Ｐｔ−Ｒｕ合金がカーボン粒子の表面にほぼ均一に分散して担持されていることが確認できた。 In FIG. 5, no significant difference was observed between the surface of the carbon particles before sputtering and the supported fine particles after sputtering from the SEM image, but from the EDS measurement, which of the Pt element and the Ru element were not detected in the carbon particles before sputtering. It was also observed that the particles were supported almost uniformly on the surface of the supported fine particles. From this, it was confirmed that the Pt—Ru alloy was supported on the surface of the carbon particles in a substantially uniform manner.
次に、調製試料及び市販試料それぞれの電気化学測定を行った。
電極は、調製試料及び市販試料それぞれを超純水１０ｍｌに分散させたものから２０μｌとり、カーボン電極上に乗せ、乾燥後、濃度が０．０１重量％のナフィオン／ＥｔＯＨ溶液で固定した。そして、サイクリックボルタムメトリー（ＣＶ）測定、回転電極法による水素酸化測定、ＣＯストリッピング測定を行った。
Next, the electrochemical measurement of each of the prepared sample and the commercial sample was performed.
20 μl of each of the prepared sample and the commercially available sample dispersed in 10 ml of ultrapure water was placed on the electrode, placed on a carbon electrode, dried, and fixed with a Nafion / EtOH solution having a concentration of 0.01% by weight. Then, cyclic voltammetry (CV) measurement, hydrogen oxidation measurement by a rotating electrode method, and CO stripping measurement were performed.
図６（Ａ）は、調製試料のＣＶ測定結果である電流・電位曲線を示す図であり、図６（Ｂ）は、市販試料のＣＶ測定結果である電流・電位曲線を示す図である。
ＣＶの測定条件は、電解液として１Ｎ、Ｈ２ＳＯ４（Ｎ２飽和）を用い、掃引速度を２０ｍＶ／ｓとし、電極径を５ｍｍφとした。
FIG. 6A is a diagram showing a current / potential curve which is a CV measurement result of a prepared sample, and FIG. 6B is a diagram showing a current / potential curve which is a CV measurement result of a commercially available sample.
The measurement conditions for CV were 1N, H 2 SO 4 (N 2 saturation) as the electrolyte, the sweep rate was 20 mV / s, and the electrode diameter was 5 mmφ.
図６（Ａ）に示すように、調製試料では、０〜０．２Ｖの領域に水素吸着、脱着を示すカソード電流、アノード電流が認められた。図６（Ｂ）に示すように、市販試料では、ＣＶと類似した電流・電位曲線の形状を示した。このことから、調製試料にはＰｔ−Ｒｔ合金が担持されていることが明らかとなった。 As shown in FIG. 6A, in the prepared sample, a cathode current and an anode current indicating hydrogen adsorption and desorption were observed in the region of 0 to 0.2V. As shown in FIG. 6B, the commercially available sample showed a current / potential curve shape similar to CV. From this, it became clear that the Pt—Rt alloy was supported on the prepared sample.
図７（Ａ）は、調製試料及び市販試料それぞれにおいてＨ２ＳＯ４中で回転電極法による水素酸化測定を行った結果である電流・電位曲線を示す図である。尚、回転電極法は、電気化学測定法の一種であり、電極を一定速度で回転させ、その時の反応電流を測定するものである。通常水素酸化反応や酸素還元反応の解析に用いられる。
回転電極法の測定条件は、電解液として１Ｎ、Ｈ２ＳＯ４（水素飽和）を用い、掃引速度を２０ｍＶ／ｓとし、電極径を５ｍｍφとし、回転速度を１６００ｒｐｍとした。
FIG. 7A is a diagram showing a current / potential curve as a result of performing hydrogen oxidation measurement by a rotating electrode method in H 2 SO 4 for each of a prepared sample and a commercially available sample. The rotating electrode method is a kind of electrochemical measuring method, in which the electrode is rotated at a constant speed and the reaction current at that time is measured. Usually used for analysis of hydrogen oxidation reaction and oxygen reduction reaction.
The measurement conditions of the rotating electrode method were 1N, H 2 SO 4 (hydrogen saturation) as an electrolyte, a sweep speed of 20 mV / s, an electrode diameter of 5 mmφ, and a rotation speed of 1600 rpm.
図７（Ａ）に示すように、調製試料と市販試料のいずれも０Ｖ付近から水素酸化に起因する電流の急激な立ち上がりが認められた。また、調製試料の拡散限界電流は市販試料の約７割の２５０μＡとなっていた。尚、拡散限界電流とは、ほぼ一定となった電流値をいう。
しかしながら、市販試料のＰｔ担持量が３．２μｇであるのに対し、調製試料のＰｔ担持量は０．１μｇでしたので、調製試料のＰｔ担持量は市販試料の約１／３０となっていた。
As shown in FIG. 7A, both the prepared sample and the commercially available sample showed a sudden rise in current due to hydrogen oxidation from around 0V. The diffusion limit current of the prepared sample was about 70% of the commercially available sample, which was 250 μA. The diffusion limit current is a current value that is substantially constant.
However, the Pt carrying amount of the commercial sample was 3.2 μg, whereas the Pt carrying amount of the prepared sample was 0.1 μg, so the Pt carrying amount of the prepared sample was about 1/30 of the commercial sample. .
そこで、図７（Ａ）の電流・電位曲線を単位Ｐｔ担持量あたりの限界電流として表すと図７（Ｂ）のようになる。図７（Ｂ）によれば、Ｐｔ担持量あたりの限界電流は、市販試料に比べて調製試料の方が約２５倍大きな値を示していることがわかった。つまり、多角バレルスパッタ装置を用いてＰｔ−Ｒｕ合金を担持した担持微粒子からなる調製試料（Ｐｔ−Ｒｕ合金担持触媒）では、ＰｔやＲｕの担持量を市販試料の１／３０まで大幅に減少させても、市販試料と同等の特性を得ることができる。これは、多角バレルスパッタ装置を用いてカーボン粒子の見掛け表面に選択的にＰｔ−Ｒｕ合金からなる超微粒子又は薄膜を担持（修飾）させたことに起因していると考えられる。つまり、従来法で調製された触媒の細孔内に担持されたＰｔ−Ｒｕ合金は、水素酸化反応にはほとんど寄与していないことを示している。従って、図２に示す多角バレルスパッタ装置は、高効率で低コストな電極触媒調製法を実現するものとして極めて有効である。 Therefore, when the current / potential curve of FIG. 7A is expressed as a limit current per unit Pt loading, FIG. 7B is obtained. According to FIG. 7 (B), it was found that the limit current per Pt loading was about 25 times larger in the prepared sample than in the commercially available sample. In other words, in a prepared sample (Pt-Ru alloy-supported catalyst) made of supported fine particles supporting a Pt-Ru alloy using a polygonal barrel sputtering apparatus, the supported amount of Pt and Ru is greatly reduced to 1/30 of the commercially available sample. However, characteristics equivalent to those of a commercially available sample can be obtained. This is considered to be caused by selectively supporting (modifying) ultrafine particles or a thin film made of a Pt—Ru alloy on the apparent surface of carbon particles using a polygonal barrel sputtering apparatus. That is, it is shown that the Pt—Ru alloy supported in the pores of the catalyst prepared by the conventional method hardly contributes to the hydrogen oxidation reaction. Therefore, the polygonal barrel sputtering apparatus shown in FIG. 2 is extremely effective as a means for realizing a highly efficient and low cost electrode catalyst preparation method.
図８（Ａ）は、ＣＯストリッピングの結果を示す電流・電位曲線であり、図８（Ｂ）は、ＣＯストリッピングによって得られた実際のＣＯ酸化電流を担持されたＰｔ量で規格化した図である。ＣＯストリッピングとは、あらかじめ電極表面に吸着させたＣＯを、電位を＋側（アノード側）に印加することで酸化してＣＯ２として電極表面から脱離させることをいう。
尚、図８（Ａ）は各ピーク電流値を１としてノーマライイズしたものである。
ＣＯストリッピングの測定条件は、電解液として１Ｎ、Ｈ２ＳＯ４を用い、掃引速度を２０ｍＶ／ｓとし、電極径を５ｍｍφとし、ＣＯ吸着を５分間とし、電位を８０ｍＶとし、Ｎ２パージを３０分間とした。
FIG. 8A is a current / potential curve showing the result of CO stripping, and FIG. 8B is a graph in which the actual CO oxidation current obtained by CO stripping is normalized by the amount of supported Pt. FIG. CO stripping means that CO adsorbed on the electrode surface in advance is oxidized by applying a potential to the + side (anode side) and desorbed from the electrode surface as CO 2 .
In FIG. 8A, each peak current value is set to 1 and normalized.
The measurement conditions for CO stripping are 1N, H 2 SO 4 as an electrolyte, a sweep rate of 20 mV / s, an electrode diameter of 5 mmφ, CO adsorption of 5 minutes, a potential of 80 mV, and N 2 purge. 30 minutes.
図８（Ａ）によれば、調製試料と市販試料を比べると調製試料の方がピーク形状がシャープであり、ピーク位置も０．５７Ｖと市販試料より０．１２Ｖ低電位側にシフトしている。また、ＣＯ酸化電流の立ち上がりも低電位側から開始されている。これらのことから、調製試料の方がＣＯ酸化活性がより高いことが明らかである。 According to FIG. 8A, when the prepared sample and the commercial sample are compared, the peak shape of the prepared sample is sharper, and the peak position is also 0.57 V, which is shifted to the lower potential side by 0.12 V from the commercial sample. . The rising of the CO oxidation current is also started from the low potential side. From these, it is clear that the prepared sample has higher CO oxidation activity.
しかし、文献値のアーク溶解法で調製した試料（Ｐｔ組成が５０原子％のＰｔ−Ｒｕ合金）である図８（Ａ）に示す（ａ）の曲線の酸化ピークと比べると、調製試料はまだ約０．１Ｖ高くなっていることから、より半値幅の小さい合金を担持できれば、このピークはさらに０．４７Ｖに近づくものと考えられる。また、図８（Ａ）に示す（ｂ）は、Ｐｔディスク電極についてのＣＯストリッピングの結果を示す電流・電位曲線である。 However, compared with the oxidation peak of the curve (a) shown in FIG. 8 (A), which is a sample prepared by the arc melting method of the literature value (Pt-Ru alloy having a Pt composition of 50 atomic%), the prepared sample is still Since it is higher by about 0.1 V, it is considered that this peak further approaches 0.47 V if an alloy with a smaller half width is supported. Further, (b) shown in FIG. 8A is a current / potential curve showing the result of CO stripping for the Pt disk electrode.
また、図８（Ｂ）に示すように、調製試料では担持Ｐｔ量が市販試料の１／５であるにも関わらず、約１０倍の酸化電流が観測された。 Further, as shown in FIG. 8 (B), in the prepared sample, although the amount of supported Pt was 1/5 of the commercially available sample, an oxidation current of about 10 times was observed.
ＣＯ酸化電流と水素酸化電流の増大については次のように考察した。
図９（Ｂ）に示すように、担体であるカーボン粒子１０１には様々な形状の細孔１０２を有する。ここで、従来のウエット法では、前駆体であるＰｔとＲｕの錯イオンを細孔に含浸して担持させた後、水素雰囲気下で加熱還元して調製されている。その結果、従来のウエット法で調製された試料は、様々な合金組成を有するＰｔ−Ｒｕ合金が見掛け表面及び細孔内にも多数担持されていると考えられ、また還元されていないＰｔイオンも存在するかもしれない。
The increase in the CO oxidation current and the hydrogen oxidation current was considered as follows.
As shown in FIG. 9B, the carbon particles 101 as the carrier have pores 102 having various shapes. Here, the conventional wet method is prepared by impregnating and supporting complex ions of Pt and Ru, which are precursors, in a pore, and then heating and reducing in a hydrogen atmosphere. As a result, in the sample prepared by the conventional wet method, it is considered that a large number of Pt—Ru alloys having various alloy compositions are supported on the apparent surface and in the pores, and Pt ions that are not reduced are also present. May exist.
これに対し、多角バレルスパッタ装置を用いた場合、Ｐｔ原子とＲｕ原子が一定の組成比でスパッタリングされることから、図１（Ｃ）に示すように、比較的均一な組成を有する合金が主にカーボン粒子３の見掛け表面上に担持されていると考えられる。この担持形態の違いと担持された合金組成の均一化により、本実施の形態による担持微粒子のＰｔ担持量が１．４原子％と従来の担持微粒子に比べて少量であっても、本実施の形態による担持微粒子の方が図６乃至図８に示すように活性が高かったのではないかと考えられる。すなわち、ＣＯ酸化反応も水素酸化反応と同様に主にカーボン粒子の見掛け表面に担持されているＰｔ−Ｒｕ合金上で起こると考えられる。 On the other hand, when a polygonal barrel sputtering apparatus is used, since Pt atoms and Ru atoms are sputtered at a constant composition ratio, an alloy having a relatively uniform composition is mainly used as shown in FIG. It is considered that the carbon particles 3 are supported on the apparent surface. Due to the difference in the supported form and the homogeneity of the supported alloy composition, even if the amount of supported Pt of the supported fine particles according to the present embodiment is 1.4 atom%, which is a small amount compared with the conventional supported fine particles, It is considered that the supported fine particles according to the form had higher activity as shown in FIGS. That is, it is considered that the CO oxidation reaction occurs mainly on the Pt—Ru alloy supported on the apparent surface of the carbon particles as in the hydrogen oxidation reaction.
尚、本発明は上述した実施形態に限定されるものではなく、本発明の主旨を逸脱しない範囲内で種々変更して実施することが可能である。
例えば上記実施の形態では、微粒子の見掛け表面に選択的に超微粒子又は薄膜を担持する方法としてスパッタリング法を用いているが、本発明はこれに限定されるものではなく、スパッタリング法以外のドライプロセス法を用いることも可能であり、例えば蒸着法、ＣＶＤ法を用いることも可能である。
Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the sputtering method is used as a method for selectively supporting ultrafine particles or a thin film on the apparent surface of the fine particles, but the present invention is not limited to this, and a dry process other than the sputtering method is used. For example, a vapor deposition method or a CVD method can also be used.
１…真空容器
１ａ…円筒部
１ｂ…六角型バレル
２…ターゲット
３…微粒子（カーボン粒子）
４〜９…配管
１０…ターボ分子ポンプ（ＴＭＰ）
１１…ポンプ（ＲＰ）
１２〜１４…第１〜第３バルブ
１５…窒素ガス導入機構
１６…アルゴンガス導入機構
１７ａ,１７ｂ…ヒータ
１８…バイブレータ
１９…圧力計
２０…ガス導入機構
２１…細孔
１０１…カーボン粒子
１０２…細孔
DESCRIPTION OF SYMBOLS 1 ... Vacuum container 1a ... Cylindrical part 1b ... Hexagonal barrel 2 ... Target 3 ... Fine particle (carbon particle)
4-9 ... Piping 10 ... Turbo molecular pump (TMP)
11 ... Pump (RP)
12-14 ... First to third valves 15 ... Nitrogen gas introduction mechanism 16 ... Argon gas introduction mechanism 17a, 17b ... Heater 18 ... Vibrator 19 ... Pressure gauge 20 ... Gas introduction mechanism 21 ... Pore 101 ... Carbon particle 102 ... Fine Hole
Claims (9)
前記断面に対してほぼ垂直方向を回転軸として前記真空容器を回転させることにより該真空容器内の微粒子を攪拌あるいは回転させながらスパッタリングを行うことで、該微粒子の表面に該微粒子より粒径の小さい超微粒子又は薄膜を担持する担持微粒子の製造方法であって、
前記担持微粒子における前記超微粒子又は薄膜は、前記複数の細孔内より前記微粒子の見掛け表面に多く担持されており、
前記担持微粒子は、前記超微粒子又は薄膜が担持されていない前記細孔を有し、
前記担持微粒子は、１次電池の電極触媒、２次電池の電極触媒、燃料電池の電極触媒、１次電池の電極材料、２次電池の電極材料、及び燃料電池の電極材料のうち少なくとも一つに用いられるものであることを特徴とする担持微粒子の製造方法。 In a vacuum vessel having a polygonal internal shape with a cross section substantially parallel to the direction of gravity, fine particles having a plurality of pores on the surface are contained,
Sputtering is performed while stirring or rotating the fine particles in the vacuum container by rotating the vacuum container about a direction substantially perpendicular to the cross section as a rotation axis, so that the particle diameter is smaller than the fine particles on the surface of the fine particles. A method for producing a supported fine particle carrying an ultrafine particle or a thin film,
The ultrafine particles or thin film in the supported fine particles are supported more on the apparent surface of the fine particles than in the plurality of pores,
The supported fine particles have the pores on which the ultrafine particles or thin film is not supported,
The supported fine particles are at least one of an electrode catalyst for a primary battery, an electrode catalyst for a secondary battery, an electrode catalyst for a fuel cell, an electrode material for a primary battery, an electrode material for a secondary battery, and an electrode material for a fuel cell. A method for producing supported microparticles, characterized in that it is used in the above.
前記微粒子に振動を加えると共に前記断面に対してほぼ垂直方向を回転軸として前記真空容器を回転させることにより該真空容器内の微粒子を攪拌あるいは回転させながらスパッタリングを行うことで、該微粒子の表面に該微粒子より粒径の小さい超微粒子又は薄膜を担持する担持微粒子の製造方法であって、
前記担持微粒子における前記超微粒子又は薄膜は、前記複数の細孔内より前記微粒子の見掛け表面に多く担持されており、
前記担持微粒子は、前記超微粒子又は薄膜が担持されていない前記細孔を有し、
前記担持微粒子は、１次電池の電極触媒、２次電池の電極触媒、燃料電池の電極触媒、１次電池の電極材料、２次電池の電極材料、及び燃料電池の電極材料のうち少なくとも一つに用いられるものであることを特徴とする担持微粒子の製造方法。 In a vacuum vessel having a polygonal cross-sectional shape, fine particles having a plurality of pores on the surface are contained,
Sputtering is performed while stirring or rotating the fine particles in the vacuum vessel by applying vibration to the fine particles and rotating the vacuum vessel about a direction substantially perpendicular to the cross section as a rotation axis. A method for producing a supported fine particle carrying a fine particle or a thin film having a smaller particle diameter than the fine particle,
The ultrafine particles or thin film in the supported fine particles are supported more on the apparent surface of the fine particles than in the plurality of pores,
The supported fine particles have the pores on which the ultrafine particles or thin film is not supported,
The supported fine particles are at least one of an electrode catalyst for a primary battery, an electrode catalyst for a secondary battery, an electrode catalyst for a fuel cell, an electrode material for a primary battery, an electrode material for a secondary battery, and an electrode material for a fuel cell. A method for producing supported microparticles, characterized in that it is used in the above.
前記真空容器を加熱すると共に前記断面に対してほぼ垂直方向を回転軸として前記真空容器を回転させることにより該真空容器内の微粒子を攪拌あるいは回転させながらスパッタリングを行うことで、該微粒子の表面に該微粒子より粒径の小さい超微粒子又は薄膜を担持する担持微粒子の製造方法であって、
前記担持微粒子における前記超微粒子又は薄膜は、前記複数の細孔内より前記微粒子の見掛け表面に多く担持されており、
前記担持微粒子は、前記超微粒子又は薄膜が担持されていない前記細孔を有し、
前記担持微粒子は、１次電池の電極触媒、２次電池の電極触媒、燃料電池の電極触媒、１次電池の電極材料、２次電池の電極材料、及び燃料電池の電極材料のうち少なくとも一つに用いられるものであることを特徴とする担持微粒子の製造方法。 In a vacuum vessel having a polygonal cross-sectional shape, fine particles having a plurality of pores on the surface are contained,
By heating the vacuum vessel and rotating the vacuum vessel about a direction substantially perpendicular to the cross section as a rotation axis, sputtering is performed while stirring or rotating the fine particles in the vacuum vessel. A method for producing a supported fine particle carrying a fine particle or a thin film having a smaller particle diameter than the fine particle,
The ultrafine particles or thin film in the supported fine particles are supported more on the apparent surface of the fine particles than in the plurality of pores,
The supported fine particles have the pores on which the ultrafine particles or thin film is not supported,
The supported fine particles are at least one of an electrode catalyst for a primary battery, an electrode catalyst for a secondary battery, an electrode catalyst for a fuel cell, an electrode material for a primary battery, an electrode material for a secondary battery, and an electrode material for a fuel cell. A method for producing supported microparticles, characterized in that it is used in the above.
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