JP2009021199A - Electrolyte membrane for polymer fuel cell, electrolyte-membrane/catalyst-layer junction material and electrolyte-membrane/electrode junction material using the same, and fuel cells - Google Patents

Electrolyte membrane for polymer fuel cell, electrolyte-membrane/catalyst-layer junction material and electrolyte-membrane/electrode junction material using the same, and fuel cells Download PDF

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JP2009021199A
JP2009021199A JP2007185046A JP2007185046A JP2009021199A JP 2009021199 A JP2009021199 A JP 2009021199A JP 2007185046 A JP2007185046 A JP 2007185046A JP 2007185046 A JP2007185046 A JP 2007185046A JP 2009021199 A JP2009021199 A JP 2009021199A
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proton conductive
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Hironobu Nishimura
浩宣 西村
Rei Hiromitsu
礼 弘光
Yoshikazu Osada
美和 長田
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Dai Nippon Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrolyte membrane for polymer fuel cell having an even distribution and rigid structure with high stability in size and high performance for gas barrier; and to provide an electrolyte-membrane/catalyst-layer junction material and electrolyte-membrane/electrode junction material using the same, and fuel cell. <P>SOLUTION: The electrolyte membrane for polymer fuel cell contains a proton conductive materials A(2) and B(3). The proton conductive material A(2) has a film-forming capability obtained by self-assembly function. The electrolyte-membrane/catalyst-layer junction material has a catalyst layer comprising a catalyst particle and an electrolyte binder on both front and back sides of the electrolyte membrane, and layered in such structure as catalyst layer/electrolyte membrane/catalyst layer. The electrolyte-membrane/electrode junction material has the catalyst layer comprising the catalyst particle and the electrolyte binder, and electrode comprising an electrode base material, as layered in such structure from the front surface as electrode base material/catalyst layer/electrolyte membrane/catalyst layer/electrode base material. The electrolyte-membrane/electrode junction material is used for the fuel cell. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、固体高分子形燃料電池用電解質膜とこれを用いた電解質膜−触媒層接合体及び電解質膜−電極接合体、並びに燃料電池に関するものである。   The present invention relates to an electrolyte membrane for a polymer electrolyte fuel cell, an electrolyte membrane-catalyst layer assembly and an electrolyte membrane-electrode assembly using the same, and a fuel cell.

固体高分子形燃料電池はプロトン伝導性を有する固体高分子膜を電解質とし、この膜の両面に燃料極及び空気極を接合して構成され、燃料極に水素、空気極に酸素あるいは空気を供給して電気化学反応により発電するシステムである。各電極では下記反応が起こっている。   A polymer electrolyte fuel cell is made up of a solid polymer membrane with proton conductivity as an electrolyte, and a fuel electrode and an air electrode are joined to both sides of this membrane. Hydrogen is supplied to the fuel electrode and oxygen or air is supplied to the air electrode. This is a system that generates electricity through an electrochemical reaction. The following reactions occur at each electrode.

燃料極：Ｈ2 → ２Ｈ+ ＋ ２ｅ-
空気極：（１／２）Ｏ2 ＋ ２Ｈ+ ＋ ２ｅ- → Ｈ2Ｏ
全反応：Ｈ2 ＋ （１／２）Ｏ2 → Ｈ2Ｏ
これらの反応式からわかるように、発電時に生成するのは水のみである。燃料電池は次世代のクリーンエネルギーシステムの一つとして注目されている。 Fuel electrode: H 2 → 2H + + 2e −
Air electrode: (1/2) O 2 + 2H + + 2e − → H 2 O
Total reaction: H 2 + (1/2) O 2 → H 2 O
As can be seen from these reaction equations, only water is generated during power generation. Fuel cells are attracting attention as one of the next generation clean energy systems.

そして、固体高分子形燃料電池は、メタノールを燃料として供給しても発電させることが可能であり、この場合は特に直接メタノール燃料電池と呼ばれる。各電極では下記反応が起こっている。   The polymer electrolyte fuel cell can generate electric power even when methanol is supplied as a fuel. In this case, the polymer electrolyte fuel cell is particularly called a direct methanol fuel cell. The following reactions occur at each electrode.

燃料極：ＣＨ3ＯＨ＋Ｈ2Ｏ→６Ｈ+＋６ｅ-＋ＣＯ2
空気極：（３／２）Ｏ2＋６Ｈ+＋６ｅ-→３Ｈ2Ｏ
全反応：ＣＨ3ＯＨ＋（３／２）Ｏ2→２Ｈ2Ｏ＋ＣＯ2
固体高分子形燃料電池は、電解質膜としてプロトン伝導性高分子電解質膜を用い、その両面に触媒層を配置し、ついでその両面に電極基材を配置し、更にこれをセパレータで挟んだ構造をしている。電解質膜の両面に触媒層を配置したもの（即ち、触媒層／電解質膜／触媒層の層構成のもの）は、電解質膜−触媒層接合体（略称：ＣＣＭ）と称されており、さらに、その電解質膜−触媒層接合体の両面に電極基材を配置したもの（即ち、電極基材／触媒層／電解質膜／触媒層／電極基材の層構成のもの）は、電解質膜−電極接合体（略称：ＭＥＡ）と称されている。 Fuel electrode: CH 3 OH + H 2 O → 6H + + 6e − + CO 2
Air electrode: (3/2) O 2 + 6H + + 6e − → 3H 2 O
All reactions: CH 3 OH + (3/2) O 2 → 2H 2 O + CO 2
A polymer electrolyte fuel cell has a structure in which a proton conductive polymer electrolyte membrane is used as an electrolyte membrane, a catalyst layer is arranged on both sides thereof, an electrode base material is arranged on both sides thereof, and this is further sandwiched between separators. is doing. The one in which the catalyst layers are arranged on both surfaces of the electrolyte membrane (that is, the layer configuration of catalyst layer / electrolyte membrane / catalyst layer) is called an electrolyte membrane-catalyst layer assembly (abbreviation: CCM), An electrode base material disposed on both surfaces of the electrolyte membrane-catalyst layer assembly (ie, electrode base material / catalyst layer / electrolyte membrane / catalyst layer / electrode base material layer structure) is an electrolyte membrane-electrode joint. It is called a body (abbreviation: MEA).

プロトン伝導性高分子電解質膜としては、例えば、パーフルオロスルホン酸系のフッ素イオン交換樹脂、より具体的には、炭化水素系イオン交換膜のＣ−Ｈ結合をフッ素で置換したパーフルオロカーボンスルホン酸系ポリマー（ＰＦＳ系ポリマー）等が挙げられる。電気陰性度の高いフッ素原子を導入することで、化学的に非常に安定し、スルホン酸基の解離度が高く、高いイオン伝導性が実現できる。このようなプロトン伝導性高分子電解質膜の具体例としては、デュポン社製の「Ｎａｆｉｏｎ」（登録商標）、旭硝子（株）製の「Ｆｌｅｍｉｏｎ」（登録商標）、旭化成（株）製の「Ａｃｉｐｌｅｘ」（登録商標）、ゴア（Ｇｏｒｅ）社製の「Ｇｏｒｅ Ｓｅｌｅｃｔ」（登録商標）等が挙げられる。   Examples of proton conductive polymer electrolyte membranes include, for example, perfluorosulfonic acid-based fluorine ion exchange resins, and more specifically, perfluorocarbon sulfonic acid-based ones in which C—H bonds of hydrocarbon-based ion exchange membranes are substituted with fluorine. Examples include polymers (PFS polymers). By introducing a fluorine atom having high electronegativity, it is chemically very stable, the dissociation degree of the sulfonic acid group is high, and high ion conductivity can be realized. Specific examples of such a proton conductive polymer electrolyte membrane include “Nafion” (registered trademark) manufactured by DuPont, “Flemion” (registered trademark) manufactured by Asahi Glass Co., Ltd., and “Aciplex” manufactured by Asahi Kasei Corporation. "(Registered trademark)", "Gore Select" (registered trademark) manufactured by Gore, and the like.

これらのパーフルオロカーボンスルホン酸系ポリマーは、上記のとおり電解質膜として高い性能を示すが、一方で、コストが高いという問題がある。また、８０℃以上の高温域においては著しい劣化がみられたり、電解質膜の乾燥によりプロトン伝導性が著しく低下したりするといった不具合もみられる。さらに、含水により膨潤して大きな寸法変化を示すために、起動・停止（加湿・乾燥）の繰り返しにおいて電解質膜上に形成した触媒層が剥離するという問題も生じる。これらの欠点を補うために、高分子電解質膜に高分子繊維や無機粒子などのフィラーを埋め込むことで、高温条件下での保水性を増したり、寸法変化を抑制したりという工夫が提案されている（例えば特許文献１〜２）。
特開２００３−１５７８６２号公報 特開平６−１１１８２７号公報 These perfluorocarbon sulfonic acid-based polymers exhibit high performance as an electrolyte membrane as described above, but have a problem of high cost. In addition, there is a problem that remarkable deterioration is observed at a high temperature range of 80 ° C. or higher, and proton conductivity is remarkably lowered by drying of the electrolyte membrane. Furthermore, since it swells due to water content and shows a large dimensional change, there also arises a problem that the catalyst layer formed on the electrolyte membrane is peeled off after repeated start / stop (humidification / drying). In order to make up for these drawbacks, proposals have been made to embed fillers such as polymer fibers and inorganic particles in the polymer electrolyte membrane to increase water retention under high temperature conditions and to suppress dimensional changes. (For example, Patent Documents 1 and 2).
JP 2003-157862 A JP-A-6-1111827

しかし、高分子電解質膜の内部にフィラーを埋め込むことにより、耐熱性の向上や機械強度の向上、保水性の向上など一定の性能向上が見られる一方で、フィラー成分が凝集したり、電解質膜内部に不均一に分布したりすることにより、期待された性能が十分に発揮されていない可能性がある。   However, by embedding filler inside the polymer electrolyte membrane, certain performance improvements such as improved heat resistance, improved mechanical strength, and improved water retention can be seen. In such a case, the expected performance may not be sufficiently exhibited.

本発明は、上記課題を解決するため、均一な分布と強固な構造を持ち、寸法安定性とガスバリア性の高い固体高分子形燃料電池用電解質膜とこれを用いた電解質膜−触媒層接合体及び電解質膜−電極接合体、並びに燃料電池を提供する。   In order to solve the above problems, the present invention has an electrolyte membrane for a polymer electrolyte fuel cell having a uniform distribution and a strong structure, high dimensional stability and gas barrier properties, and an electrolyte membrane-catalyst layer assembly using the same And an electrolyte membrane-electrode assembly and a fuel cell.

本発明の固体高分子形燃料電池用電解質膜は、プロトン伝導性材料Ａとプロトン伝導性材料Ｂとをプロトン伝導性材料として含む固体高分子形燃料電池用電解質膜であって、前記プロトン伝導性材料Ａは、自己組織化による造膜性があることを特徴とする。   An electrolyte membrane for a polymer electrolyte fuel cell according to the present invention is an electrolyte membrane for a polymer electrolyte fuel cell containing a proton conductive material A and a proton conductive material B as proton conductive materials, wherein the proton conductivity is The material A is characterized by having a film-forming property by self-organization.

本発明の電解質膜−触媒層接合体は、前記電解質膜の両面に、それぞれ触媒粒子および電解質バインダーからなる触媒層が形成されていることを特徴とする。   The electrolyte membrane-catalyst layer assembly of the present invention is characterized in that catalyst layers made of catalyst particles and an electrolyte binder are formed on both surfaces of the electrolyte membrane, respectively.

本発明の電解質膜−電極接合体は、前記電解質膜の両面に、それぞれ触媒粒子および電解質バインダーからなる触媒層と電極基材からなる電極が形成されていることを特徴とする。   The electrolyte membrane-electrode assembly of the present invention is characterized in that a catalyst layer composed of catalyst particles and an electrolyte binder and an electrode composed of an electrode substrate are formed on both surfaces of the electrolyte membrane, respectively.

本発明の燃料電池は、前記電解質膜−電極接合体を用いた燃料電池である。   The fuel cell of the present invention is a fuel cell using the electrolyte membrane-electrode assembly.

本発明によれば、均一な分布と構造を持つ支持体を内包するプロトン伝導性電解質膜を得ることができる。また、自己組織化による造膜性のあるフィラーにより高いガスバリア性が発現し、燃料あるいは酸化剤のクロスリークによる発電性能の低下を抑制できる。さらに、液体燃料を用いる直接メタノール燃料電池での使用においても、アノード側からカソード側へのメタノール水溶液のクロスオーバーを抑制し、発電性能の低下を防ぐ効果を示す。さらに、高温低加湿条件でも高いプロトン伝導性を有するフィラーを用いることにより、より高温での発電性能の向上効果が得られる。   According to the present invention, it is possible to obtain a proton conductive electrolyte membrane that encloses a support having a uniform distribution and structure. Moreover, a high gas barrier property is expressed by the filler having a film-forming property by self-organization, and a decrease in power generation performance due to cross leak of fuel or oxidant can be suppressed. Furthermore, even when used in a direct methanol fuel cell using liquid fuel, the crossover of the methanol aqueous solution from the anode side to the cathode side is suppressed, and the effect of preventing the decrease in power generation performance is shown. Furthermore, the effect of improving the power generation performance at higher temperatures can be obtained by using a filler having high proton conductivity even under high temperature and low humidification conditions.

本発明において、鱗片状粒子材料の自己組織化による造膜性があるとは、扁平な粒子形状を有する粒子が液中において沈降する際に、構造安定化のために互いに面を平行に揃える性質を利用したもので、外力を印加することなく積層体を形成する性質を示す。また、例えばシリカ材料のように、表面のシラノール基同士が脱水縮合してシロキサン結合（−Ｓｉ−ＯＨ ＋ ＨＯ−Ｓｉ− → −Ｓｉ−Ｏ−Ｓｉ−，但しＳｉは４価であるが２価を省略している。）を形成し、粒子間が結合する性質を有する材料では、粒子自体で造膜性を有する。   In the present invention, the film-forming property due to the self-organization of the scaly particle material means that when particles having a flat particle shape settle in the liquid, the surfaces are aligned in parallel to stabilize the structure. It shows the property of forming a laminate without applying an external force. Further, as in a silica material, silanol groups on the surface are dehydrated and condensed to form a siloxane bond (—Si—OH + HO—Si— → —Si—O—Si—, where Si is tetravalent but divalent. In the case of a material having a property of bonding between particles, the particles themselves have a film-forming property.

前記自己組織化による造膜性のあるプロトン伝導性材料Ａは、前記電解質膜の２重量％〜５０重量％の範囲であることが好ましく、前記プロトン伝導性材料Ｂは前記電解質膜の５０重量％〜９８重量％の範囲であることが好ましい。前記自己組織化による造膜性のあるプロトン伝導性材料Ａが２重量％未満では、強固な構造と寸法安定性とガスバリア性の改善はそれほど高くはならない。また、プロトン伝導性材料Ａが５０重量％を超えると、膜形状を保つのが難しくなる傾向となる。   The proton conductive material A having a film-forming property due to self-assembly is preferably in the range of 2% to 50% by weight of the electrolyte membrane, and the proton conductive material B is 50% by weight of the electrolyte membrane. It is preferable to be in the range of -98% by weight. If the proton conductive material A having a film-forming property due to self-organization is less than 2% by weight, the improvement of the strong structure, dimensional stability and gas barrier property is not so high. If the proton conductive material A exceeds 50% by weight, it tends to be difficult to maintain the membrane shape.

前記プロトン伝導性材料Ｂは、フッ素系プロトン伝導性高分子材料、炭化水素系プロトン伝導性材料、無機プロトン伝導性材料、有機−無機ハイブリッドプロトン伝導性材料、イオン液体、およびこれらの混合物からなる群から選択されることが好ましい。フッ素系プロトン伝導性高分子材料は、ナフィオン（商品名）、フレミオン（商品名）、アシプレックス（商品名）等がある。炭化水素系プロトン伝導性材料はリン酸含浸ポリベンズイミダゾール（ＰＢＩ）、アルキルスルホン酸含浸ポリベンズイミダゾール（ＰＢＩ）、スルホン化４−フェノキシベンゾイル−１，４−フェニレン（ＳＰＰＢＰ）、スルホン化ポリエーテルエーテルケトン（ＳＰＥＥＫ）、スチレン−エチレン／ブチレン／エチレンブロック共重合体等がある。無機プロトン伝導性材料としては、酸化タングステンや酸化スズの水和物などの金属水和酸化物、ＳｉＯ2−Ｈ3ＰＯ4やＳｉＯ2−ＴｉＯ2−Ｐ2Ｏ5などの多元系シリカ、ＴｉＯ2−Ｈ3ＰＯ4などの金属リン酸化合物、リンタングステン酸やリンモリブデン酸などのヘテロポリ酸複合体、ＣｓＨＳＯ4やＣｓＨ2ＰＯ4、ＳｎXＩｎ(1-X)Ｐ2Ｏ7などの無機酸素酸塩などが例示できる。有機−無機ハイブリッド材料としては、シリカとポリエチレンオキシド（ＰＥＯ）やポリプロピレンオキシド（ＰＰＯ）、またはポリテトラメチレンオキシド（ＰＴＭＯ）などのポリエーテルポリマーからなるハイブリッド材料や、さらにこれらにタングストリン酸などの固体酸を添加したものが例として挙げられる。イオン液体としては、１−エチル−３−メチルイミダゾリウム ビス（トリフルオロメチルスルホニル）イミド（ＥＭＩ−ＴＦＳＩ）や、１−エチル−３−メチルイミダゾリウムトリフレート（ＥＭＩ−Ｔｆ）、１−エチル−３−メチルイミダゾリウム フルオロヒドロジェネレート（ＥＭＩｍ（ＨＦ）ｎＦ）などが例として挙げられる。前記プロトン伝導性材料Ｂは、自己組織化による造膜性はなくてもよい。すなわち、非自己造膜性であってもよい。 The proton conductive material B is a group consisting of a fluorine-based proton conductive polymer material, a hydrocarbon proton conductive material, an inorganic proton conductive material, an organic-inorganic hybrid proton conductive material, an ionic liquid, and a mixture thereof. Is preferably selected from. Examples of the fluorine-based proton conductive polymer material include Nafion (trade name), Flemion (trade name), and Aciplex (trade name). Hydrocarbon proton conductive materials are phosphoric acid impregnated polybenzimidazole (PBI), alkylsulfonic acid impregnated polybenzimidazole (PBI), sulfonated 4-phenoxybenzoyl-1,4-phenylene (SPPBP), sulfonated polyether ether Examples include ketones (SPEEK) and styrene-ethylene / butylene / ethylene block copolymers. Examples of inorganic proton conductive materials include metal hydrated oxides such as tungsten oxide and tin oxide hydrate, multi-component silica such as SiO 2 —H 3 PO 4 and SiO 2 —TiO 2 —P 2 O 5 , TiO 2. Metal phosphate compounds such as 2- H 3 PO 4 , heteropoly acid complexes such as phosphotungstic acid and phosphomolybdic acid, inorganic substances such as CsHSO 4 , CsH 2 PO 4 , Sn X In (1-X) P 2 O 7 Examples thereof include oxyacid salts. Organic-inorganic hybrid materials include hybrid materials made of polyether polymers such as silica and polyethylene oxide (PEO), polypropylene oxide (PPO), or polytetramethylene oxide (PTMO), and solids such as tungstophosphoric acid. An example to which an acid is added is given. Examples of the ionic liquid include 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (EMI-TFSI), 1-ethyl-3-methylimidazolium triflate (EMI-Tf), 1-ethyl- An example is 3-methylimidazolium fluorohydrogenate (EMIm (HF) nF). The proton conductive material B may not have a film forming property due to self-organization. That is, it may be non-self-forming.

前記自己組織化による造膜性のあるプロトン伝導性材料Ａは、円盤状の平均直径が０．０１μｍ〜１０．００μｍの範囲、厚みは０．０１〜１．００μｍの範囲の鱗片状材料であることが好ましい。さらに好ましい平均直径は０．０５μｍ〜１．００μｍの範囲である。鱗片状、すなわち扁平な円盤状の粒子であると、平面方向に配列しやすく、プロトン伝導性材料（Ｂ）と混合してキャスト成膜する際に成膜性が良好となる。また、表面に−ＯＨ基を有する無機材料には、脱水縮合による自己造膜性がある。ここで平均直径は、レーザー散乱法・回折式粒度分布計等の測定により、平均の厚みは走査電子顕微鏡を用いた測定により100個の粒子の平均値より、それぞれ算出する。   The proton conductive material A having a film-forming property by self-organization is a scaly material having a disk-like average diameter in the range of 0.01 μm to 10.00 μm and a thickness in the range of 0.01 to 1.00 μm. It is preferable. A more preferable average diameter is in the range of 0.05 μm to 1.00 μm. Scale-like, ie, flat, disk-like particles can be easily arranged in the plane direction, and the film-forming property is improved when cast-mixed with the proton conductive material (B). In addition, an inorganic material having a —OH group on the surface has a self-forming property by dehydration condensation. Here, the average diameter is calculated from the average value of 100 particles by measurement using a laser scattering method, a diffraction particle size distribution analyzer, or the like, and the average thickness is measured using a scanning electron microscope.

また、前記鱗片状、すなわち扁平な円盤状の粒子は、直径／厚みが５〜５０の範囲が好ましく、とくに約１０程度が好ましい。このような鱗片状、すなわち扁平な円盤状の粒子であると、平面方向に配列しやすく、プロトン伝導性材料と混合してキャスト成膜する際に成膜性が良好となる。   Further, the scale-like, ie, flat, disk-like particles preferably have a diameter / thickness in the range of 5 to 50, and particularly about 10 is preferable. Such scaly, ie, flat, disk-like particles are easy to arrange in the plane direction, and the film-forming property is improved when cast-mixed with a proton conductive material.

前記自己組織化による造膜性のあるプロトン伝導性材料Ａは、フッ素系プロトン伝導性高分子材料、炭化水素系プロトン伝導性材料、無機プロトン伝導性材料、有機−無機ハイブリッドプロトン伝導性材料、およびこれらの混合物からなる群から選択されることが好ましい。フッ素系プロトン伝導性高分子材料は、ナフィオン（商品名）、フレミオン（商品名）、アシプレックス（商品名）等がある。炭化水素系プロトン伝導性材料はリン酸含浸ポリベンズイミダゾール（ＰＢＩ）、アルキルスルホン酸含浸ポリベンズイミダゾール（ＰＢＩ）、スルホン化４−フェノキシベンゾイル−１，４−フェニレン（ＳＰＰＢＰ）、スルホン化ポリエーテルエーテルケトン（ＳＰＥＥＫ）、スチレン−エチレン／ブチレン／エチレンブロック共重合体等がある。無機プロトン伝導性材料としては、酸化タングステンや酸化スズの水和物などの金属水和酸化物、ＳｉＯ2−Ｈ3ＰＯ4やＳｉＯ2−ＴｉＯ2−Ｐ2Ｏ5などの多元系シリカ、ＴｉＯ2−Ｈ3ＰＯ4などの金属リン酸化合物、リンタングステン酸やリンモリブデン酸などのヘテロポリ酸複合体、ＣｓＨＳＯ4やＣｓＨ2ＰＯ4、ＳｎXＩｎ(1-X)Ｐ2Ｏ7などの無機酸素酸塩などが例示できる。有機−無機ハイブリッド材料としては、シリカとポリエチレンオキシド（ＰＥＯ）やポリプロピレンオキシド（ＰＰＯ）、またはポリテトラメチレンオキシド（ＰＴＭＯ）などのポリエーテルポリマーからなるハイブリッド材料や、さらにこれらにタングストリン酸などの固体酸を添加したものが例として挙げられる。 The proton conductive material A having a film-forming property by self-organization includes a fluorine-based proton conductive polymer material, a hydrocarbon-based proton conductive material, an inorganic proton conductive material, an organic-inorganic hybrid proton conductive material, and It is preferably selected from the group consisting of these mixtures. Examples of the fluorine-based proton conductive polymer material include Nafion (trade name), Flemion (trade name), and Aciplex (trade name). Hydrocarbon proton conductive materials are phosphoric acid impregnated polybenzimidazole (PBI), alkylsulfonic acid impregnated polybenzimidazole (PBI), sulfonated 4-phenoxybenzoyl-1,4-phenylene (SPPBP), sulfonated polyether ether Examples include ketones (SPEEK) and styrene-ethylene / butylene / ethylene block copolymers. Examples of inorganic proton conductive materials include metal hydrated oxides such as tungsten oxide and tin oxide hydrate, multi-component silica such as SiO 2 —H 3 PO 4 and SiO 2 —TiO 2 —P 2 O 5 , TiO 2. Metal phosphate compounds such as 2- H 3 PO 4 , heteropoly acid complexes such as phosphotungstic acid and phosphomolybdic acid, inorganic substances such as CsHSO 4 , CsH 2 PO 4 , Sn X In (1-X) P 2 O 7 Examples thereof include oxyacid salts. Organic-inorganic hybrid materials include hybrid materials made of polyether polymers such as silica and polyethylene oxide (PEO), polypropylene oxide (PPO), or polytetramethylene oxide (PTMO), and solids such as tungstophosphoric acid. An example to which an acid is added is given.

前記自己組織化による造膜性のあるプロトン伝導性材料Ａは、前記プロトン伝導性材料Ｂにより厚さ０．０１μｍ〜１．００μｍで覆われていることが好ましい。プロトン伝導性を高く維持できるからである。   It is preferable that the proton conductive material A having a film-forming property due to self-organization is covered with the proton conductive material B at a thickness of 0.01 μm to 1.00 μm. This is because high proton conductivity can be maintained.

以下、本発明に係る固体高分子形燃料電池用電解質膜及びその製造方法の実施形態について図面を参照しつつ説明する。以下の図面においては、同一符号は同一物を示す。   Hereinafter, embodiments of an electrolyte membrane for a polymer electrolyte fuel cell and a method for producing the same according to the present invention will be described with reference to the drawings. In the following drawings, the same symbols indicate the same items.

図１Ａは、本発明の一実施形態における自己組織化による造膜性のあるプロトン伝導性材料Ａ（２）の模式的斜視図である。図１Ｂは、同プロトン伝導性材料Ａ（２）のみに注目したときの自己組織した膜の模式平面図である。図１Ｃは図１Ｂの模式的断面図である。図１Ｄは、自己組織化による造膜性のある同プロトン伝導性材料Ａ（２）およびプロトン伝導性材料Ｂ（３）からなる電解質膜（１）の断面を示す模式図である。   FIG. 1A is a schematic perspective view of a proton conductive material A (2) having a film-forming property by self-organization in one embodiment of the present invention. FIG. 1B is a schematic plan view of a self-assembled membrane when attention is paid only to the proton conductive material A (2). FIG. 1C is a schematic cross-sectional view of FIG. 1B. FIG. 1D is a schematic view showing a cross section of an electrolyte membrane (1) made of the same proton conductive material A (2) and proton conductive material B (3) having a film-forming property by self-organization.

上記自己組織化による造膜性のあるプロトン伝導性材料Ａの懸濁液と上記プロトン伝導性材料Ｂの溶液を攪拌、混合した液を図示しない基板表面上にコーティングし、乾燥することにより上記電解質膜が得られる。上記自己組織化による造膜性のあるプロトン伝導性材料Ａの懸濁液と上記プロトン伝導性材料Ｂの溶液の混合、攪拌において、スターラーや超音波照射、ボールミルなどの公知の方法を用いることができる。また、上記自己組織化による造膜性のあるプロトン伝導性材料Ａ（２）の懸濁液と上記プロトン伝導性材料Ｂ（３）の溶液を混合、攪拌した液の基板上へのコーティングにおいて、ナイフコートやグラビアコート、バーコート、スクリーン印刷など公知の方法を用いることができる。また、上記基板としては、ガラスやアルミナなどの公知のセラミックスからなる基材やポリエチレンフィルム、ポリテトラフルオロエチレンフィルムなど、公知のポリマーフィルムなど、上記自己組織化による造膜性のあるプロトン伝導性材料Ａ（２）およびプロトン伝導性材料Ｂ（３）からなる電解質膜が乾燥後に該基材から剥離することが可能な材質であれば、いかなる材質の基材でも用いることができる。また、任意の形状の皿状の容器に上記溶液を注ぎ、加熱、乾燥させることにより成膜を行ってもよい。乾燥方法は、２段階の加熱により行うのが好ましい。第1段階の加熱は、プロトン伝導性材料Ａの懸濁液とプロトン伝導性材料Ｂの溶液を攪拌する際に、５０℃から１００℃の範囲で行う。これは、上記溶液の粘度をコーティングに適した状態に調整することを目的とする。第２段階の加熱は、上記手法によりコーティングされた溶液を乾燥、成膜することを目的に８０℃から１５０℃の範囲で行う。上記加熱温度は、用いるプロトン伝導性材料Ａもしくはプロトン伝導性材料Ｂの耐熱性やガラス転移点により最適値が異なるため、上記温度領域に限定するものではない。また、成膜処理は枚葉で行ってもよいし、長尺の基材フィルム上に連続的にコーティングすることにより任意の長さの長尺の膜を成膜してもよい。   The above-mentioned electrolyte is obtained by coating a suspension of the proton conductive material A having a film-forming property by self-organization and the solution of the proton conductive material B and mixing the mixture on a substrate surface (not shown) and drying. A membrane is obtained. A known method such as a stirrer, ultrasonic irradiation, or ball mill may be used for mixing and stirring the suspension of the proton conductive material A having a film-forming property by self-organization and the solution of the proton conductive material B. it can. In addition, in the coating on the substrate of the liquid obtained by mixing and stirring the suspension of the proton conductive material A (2) having a film-forming property by the self-assembly and the solution of the proton conductive material B (3), Known methods such as knife coating, gravure coating, bar coating, and screen printing can be used. In addition, as the substrate, a base material made of a known ceramic such as glass or alumina, a known polymer film such as a polyethylene film or a polytetrafluoroethylene film, or the like, a proton conductive material having a film forming property due to self-organization. Any material can be used as long as the electrolyte membrane made of A (2) and proton conductive material B (3) can be peeled off from the substrate after drying. Further, the film may be formed by pouring the above solution into a dish-shaped container having an arbitrary shape, heating and drying. The drying method is preferably performed by two-stage heating. The first stage heating is performed in the range of 50 ° C. to 100 ° C. when the suspension of the proton conductive material A and the solution of the proton conductive material B are stirred. This aims at adjusting the viscosity of the solution to a state suitable for coating. The second stage heating is performed in the range of 80 ° C. to 150 ° C. for the purpose of drying and film-forming the solution coated by the above method. The heating temperature is not limited to the above temperature range because the optimum value varies depending on the heat resistance and the glass transition point of the proton conductive material A or proton conductive material B to be used. In addition, the film forming process may be performed on a single sheet, or a long film having an arbitrary length may be formed by continuously coating on a long base film.

上記自己組織化による造膜性のあるプロトン伝導性材料Ａ（２）は、上記プロトン伝導性材料Ｂ（３）により薄くコーティングされており、その厚さは約０．０１μｍ〜約１．００μｍである。上記プロトン伝導性材料Ｂ（３）層の厚さが約１．００μｍを超えると、上記自己組織化による造膜性のあるプロトン伝導性材料Ａ（２）の粒子同士の間に働く相互作用が上記プロトン伝導性材料Ｂ（３）層により阻害され造膜性が弱まり効果が抑制されてしまう。また、上記プロトン伝導性材料Ｂ（３）層の厚さが約０．０１μｍ未満になると、上記プロトン伝導性材料Ｂ（３）中のプロトン伝導が阻害されプロトン伝導率の低減による性能低下が見られる。このように、上記自己組織化による造膜性のあるプロトン伝導性材料Ａ（２）が造膜性を示し、かつ上記自己組織化による造膜性のあるプロトン伝導性材料Ａ（２）を覆うプロトン伝導性材料Ｂ（３）が十分なプロトン伝導率を示すには、上記自己組織化による造膜性のあるプロトン伝導性材料Ａ（２）を覆う上記プロトン伝導性材料Ｂ（３）の厚さが、適切な領域にある必要がある。   The proton conductive material A (2) having a film-forming property due to the self-assembly is thinly coated with the proton conductive material B (3), and the thickness thereof is about 0.01 μm to about 1.00 μm. is there. When the thickness of the proton conductive material B (3) layer exceeds about 1.00 μm, the interaction between the particles of the proton conductive material A (2) having a film-forming property due to self-organization is exerted. The proton conductive material B (3) layer inhibits the film-forming property and suppresses the effect. In addition, when the thickness of the proton conductive material B (3) layer is less than about 0.01 μm, proton conduction in the proton conductive material B (3) is hindered, and a decrease in performance due to a decrease in proton conductivity is observed. It is done. Thus, the proton-conductive material A (2) having a film-forming property due to the self-organization exhibits a film-forming property and covers the proton-conductive material A (2) having a film-forming property due to the self-organization. In order for the proton conductive material B (3) to exhibit a sufficient proton conductivity, the thickness of the proton conductive material B (3) covering the proton conductive material A (2) having a film-forming property due to the self-organization. Need to be in the right area.

図２は、図１に示す本発明の電解質膜１を用いた電解質膜−触媒層接合体の断面を示す模式図である。図２に示すように、電解質膜１の両面に、それぞれ触媒粒子および電解質バインダーからなる触媒層４，４’が形成されている。   FIG. 2 is a schematic view showing a cross section of an electrolyte membrane-catalyst layer assembly using the electrolyte membrane 1 of the present invention shown in FIG. As shown in FIG. 2, catalyst layers 4 and 4 'made of catalyst particles and an electrolyte binder are formed on both surfaces of the electrolyte membrane 1, respectively.

図３は本発明の一実施形態における電解質膜−電極接合体の断面図である。電解質膜１の上に触媒層４と電極基材５とからなる燃料極６が配置され、前記電解質膜１の下には触媒層４’と電極基材７とからなる空気極８が配置されている。そして、これらの両外側にさらにリブ付きセパレータおよび集電体（図示せず）が配置されることによって、単セル（燃料電池）が構成される。プロトンは燃料極６から電解質膜１内を通過して空気極８に流れる。また、電子は燃料極６から外部回路を介して空気極８に流れる。これにより燃料極６と空気極８との間に電気が流れる。   FIG. 3 is a cross-sectional view of the electrolyte membrane-electrode assembly in one embodiment of the present invention. A fuel electrode 6 composed of a catalyst layer 4 and an electrode substrate 5 is disposed on the electrolyte membrane 1, and an air electrode 8 composed of a catalyst layer 4 ′ and an electrode substrate 7 is disposed below the electrolyte membrane 1. ing. And a single cell (fuel cell) is comprised by arrange | positioning the separator with a rib and a collector (not shown) further on both these outer sides. Protons flow from the fuel electrode 6 through the electrolyte membrane 1 to the air electrode 8. Further, electrons flow from the fuel electrode 6 to the air electrode 8 through an external circuit. As a result, electricity flows between the fuel electrode 6 and the air electrode 8.

以下実施例を用いて本発明をさらに具体的に説明する。   Hereinafter, the present invention will be described more specifically with reference to examples.

（１）電解質膜の作製
無機フィラーとして、鱗片状ＳｉＯ2−Ｈ3ＰＯ4粒子（円盤状の平均直径０．９μｍ（レーザー散乱式粒度分布計による測定）、平均の厚さ０．１μｍ（走査電子顕微鏡による１００個の粒子の平均値））を使用した。プロトン伝導性材料としてＤｕＰｏｎｔ社の５重量％"Ｎａｆｉ
ｏｎ"（商品名）溶液を使用した。組成は、乾燥重量比でＳｉＯ2−Ｈ3ＰＯ4が１５重量％、
"Ｎａｆｉｏｎ"（商品名）が８５重量％となるように仕込んだ。 (1) Production of electrolyte membrane As inorganic filler, scaly SiO 2 —H 3 PO 4 particles (disk-shaped average diameter 0.9 μm (measured by laser scattering particle size distribution meter), average thickness 0.1 μm (scanning) The average value of 100 particles by electron microscope)) was used. 5% by weight "Nafi" from DuPont as proton conductive material
on "(trade name) was used. The composition is, SiO 2 -H 3 PO 4 15% by weight on a dry weight,
“Nafion” (trade name) was charged to 85% by weight.

ＳｉＯ2−Ｈ3ＰＯ4と"Ｎａｆｉｏｎ"（商品名）溶液を混合し、マグネチックスターラー
による撹拌と超音波攪拌を繰り返すことで均一な分散液を作製した。得られた分散液を５０−８０℃で加熱しながらマグネチックスターラーで攪拌し、分散媒を蒸発させながら粘度を調整した。得られた高粘度分散液をポリテトラフルオロエチレン（ＰＴＦＥ）基板上にキャスティングし、約１００℃の乾燥オーブン内で静置・乾燥することにより電解質膜を成膜した。得られた電解質膜は厚さ約１００μｍであった。 SiO 2 —H 3 PO 4 and a “Nafion” (trade name) solution were mixed, and a uniform dispersion was prepared by repeating stirring with a magnetic stirrer and ultrasonic stirring. The resulting dispersion was stirred with a magnetic stirrer while heating at 50-80 ° C., and the viscosity was adjusted while evaporating the dispersion medium. The obtained high-viscosity dispersion was cast on a polytetrafluoroethylene (PTFE) substrate, and allowed to stand and dried in a drying oven at about 100 ° C. to form an electrolyte membrane. The obtained electrolyte membrane was about 100 μm thick.

（２）加湿時の寸法変化率測定
得られた膜を長方形に切り出し、室温で蒸留水に浸漬することで十分に加湿し、加湿による寸法変化率を評価した。加湿前後の長さを測定することで次式により寸法変化率を算出した。
［（加湿後の長さ）÷（加湿前の長さ）］×１００（％）
室温（２５℃）で蒸留水に浸漬した電解質膜の寸法変化率は、１１０％であった。市販品の"
Ｎａｆｉｏｎ１１７"（商品名）膜について同様に測定した寸法変化率は、１２０％であった。

電解質膜は、加湿時における寸法変化率が"Ｎａｆｉｏｎ１１７"膜に比べて小さく、寸法安
定性に優れるといえる。無機フィラーとして用いた鱗片状ＳｉＯ2−Ｈ3ＰＯ4が膜内で強固なマトリックスを形成することによる効果と考える。その結果として、燃料電池の起動・停止の際の膜の湿潤・乾燥に伴う寸法変化が抑制されることにより、電極触媒層の剥離など電解質膜−電極接合体の破損を抑制する効果が期待できる。 (2) Dimensional change rate measurement during humidification The obtained film was cut into a rectangular shape and sufficiently humidified by being immersed in distilled water at room temperature, and the dimensional change rate due to humidification was evaluated. The dimensional change rate was calculated by the following formula by measuring the length before and after humidification.
[(Length after humidification) ÷ (Length before humidification)] x 100 (%)
The dimensional change rate of the electrolyte membrane immersed in distilled water at room temperature (25 ° C.) was 110%. "On the market"
The dimensional change rate measured in the same manner on the Nafion 117 "(trade name) film was 120%.

The electrolyte membrane has a smaller dimensional change rate during humidification than the “Nafion 117” membrane, and can be said to have excellent dimensional stability. The scaly SiO 2 —H 3 PO 4 used as the inorganic filler is considered to be an effect of forming a strong matrix in the film. As a result, an effect of suppressing breakage of the electrolyte membrane-electrode assembly such as peeling of the electrode catalyst layer can be expected by suppressing the dimensional change accompanying the wet / dry of the membrane at the start / stop of the fuel cell. .

（３）加湿時のプロトン伝導率測定
得られた膜を長方形に切り出し、室温で蒸留水に浸漬することで十分に加湿し、インピーダンスアナライザーを用いて膜の伝導率を測定した。その結果、２５℃−１００％ＲＨにおける電解質膜の伝導率は０．０７Ｓ／ｃｍであった。これは、"Ｎａｆｉｏｎ１１７"膜の伝導率０．０
８Ｓ／ｃｍとほぼ同等である。電解質膜内の鱗片状粒子のマトリックスがプロトン伝導を阻害する要因になる可能性が懸念されたが、ＳｉＯ2−Ｈ3ＰＯ4自身のプロトン伝導性により、プロトン伝導性低下が抑制されたと考えられる。 (3) Measurement of proton conductivity during humidification The obtained membrane was cut into a rectangle and sufficiently humidified by being immersed in distilled water at room temperature, and the conductivity of the membrane was measured using an impedance analyzer. As a result, the conductivity of the electrolyte membrane at 25 ° C.-100% RH was 0.07 S / cm. This is because the conductivity of the “Nafion 117” film is 0.0.
It is almost equivalent to 8 S / cm. There was a concern that the scale-like particle matrix in the electrolyte membrane might be a factor inhibiting proton conduction, but it is thought that the proton conductivity of SiO 2 —H 3 PO 4 itself suppressed the decrease in proton conductivity. .

（４）発電性能評価（メタノール燃料）
電解質膜−触媒層接合体および電解質膜−電極接合体の作製：上記（１）にて作製した厚さ約１００μｍの電解質膜の両面に、触媒（田中貴金属製Ｐｔ／Ｃ（ＴＥＣ１０Ｅ５０Ｅ）、Ｐｔ−Ｒｕ／Ｃ（ＴＥＣ６１Ｅ５４））および電解質バインダー（ＤｕＰｏｎｔ社、５重量％”Ｎａｆｉｏｎ”（商品名）溶液）からなる触媒層を形成した。具体的には、一対の基材フィルム上に上記触媒および電解質バインダーからなる触媒層を形成した触媒転写フィルムで電解質膜を挟持し、熱プレス（温度：１３５−１５０℃、圧力：４−６ＭＰａ）により電解質膜上に触媒層を転写・形成した。さらに、上記電解質膜−触媒層接合体を一対のガス拡散層（東レ社製、カーボンペーパー）で挟持し、電解質膜−電極接合体を形成した。上記電解質膜−電極接合体を燃料および酸化剤を供給するための流路を持つセパレータおよび集電体で挟持し、単セルを構成した。アノード極は３ｍｇ−Ｐｔ−Ｒｕ／ｃｍ2、カソード極は１ｍｇ−Ｐｔ／ｃｍ2とした。 (4) Power generation performance evaluation (methanol fuel)
Production of electrolyte membrane-catalyst layer assembly and electrolyte membrane-electrode assembly: Catalyst (Tanaka Kikinzoku Pt / C (TEC10E50E), Pt-) on both sides of the electrolyte membrane having a thickness of about 100 μm produced in (1) above. A catalyst layer composed of Ru / C (TEC61E54)) and an electrolyte binder (DuPont, 5 wt% “Nafion” (trade name) solution) was formed. Specifically, the electrolyte membrane is sandwiched by a catalyst transfer film in which a catalyst layer composed of the above catalyst and electrolyte binder is formed on a pair of base films, and hot pressing (temperature: 135-150 ° C., pressure: 4-6 MPa) Thus, the catalyst layer was transferred and formed on the electrolyte membrane. Further, the electrolyte membrane-catalyst layer assembly was sandwiched between a pair of gas diffusion layers (manufactured by Toray Industries, Inc., carbon paper) to form an electrolyte membrane-electrode assembly. The electrolyte membrane-electrode assembly was sandwiched between a separator having a flow path for supplying fuel and an oxidant and a current collector to constitute a single cell. The anode electrode was 3 mg-Pt-Ru / cm 2 , and the cathode electrode was 1 mg-Pt / cm 2 .

燃料として６重量％メタノール水溶液（４ｍＬ／ｍｉｎ）、酸化剤として乾燥空気（８０ｍＬ／ｍｉｎ）をそれぞれ燃料極と空気極に供給し、室温（３０℃）で上記電解質膜−電極接合体の直接メタノール燃料電池の発電性能を評価した。   A 6 wt% methanol aqueous solution (4 mL / min) as fuel and dry air (80 mL / min) as oxidant were supplied to the fuel electrode and air electrode, respectively, and direct methanol of the above electrolyte membrane-electrode assembly at room temperature (30 ° C.). The power generation performance of the fuel cell was evaluated.

得られた開放起電力は約６３８ｍＶであり、最大出力密度は１７ｍＷ／ｃｍ2が得られた。 The obtained open electromotive force was about 638 mV, and the maximum output density was 17 mW / cm 2 .

比較例として、約２００μｍの厚みを有する"Ｎａｆｉｏｎ１１７"膜を用いた単セルを同様
に評価したところ、開放起電力が約６３７ｍＶ、最大出力密度が１５ｍＷ／ｃｍ2であった。このように、"Ｎａｆｉｏｎ１１７"膜と同等以上の発電性能が得られる。つまり、低電流密度領
域はメタノールのクロスオーバーの影響でセル電位の低下が見られる領域であるが、上記本実施例の電解質膜の厚さは約１１０μｍで、"Ｎａｆｏｎ１１７"膜の厚さ（約２００μｍ）の約半
分であるにもかかわらず、比較例に対しセル電位に差異が見られなかった。これは、上記電解質膜が"Ｎａｆｉｏｎ１１７"膜に比べてメタノール透過阻止能が高いことを示している。 As a comparative example, a single cell using a “Nafion 117” film having a thickness of about 200 μm was evaluated in the same manner. As a result, the open electromotive force was about 637 mV and the maximum output density was 15 mW / cm 2 . In this way, power generation performance equal to or better than that of the “Nafion 117” film can be obtained. In other words, the low current density region is a region where the cell potential is decreased due to the crossover of methanol, but the thickness of the electrolyte membrane of the present example is about 110 μm and the thickness of the “Nafon 117” membrane (about Despite being about half of (200 μm), there was no difference in cell potential compared to the comparative example. This indicates that the electrolyte membrane has higher methanol permeation blocking ability than the “Nafion 117” membrane.

（５）発電性能評価（水素ガス燃料）
電解質膜−触媒層接合体および電解質膜−電極接合体の作製：上記（１）にて作製した厚さ約１１０μｍの電解質膜の両面に、触媒（田中貴金属製Ｐｔ／Ｃ（ＴＥＣ１０Ｅ５０Ｅ）、Ｐｔ−Ｒｕ／Ｃ（ＴＥＣ６２Ｅ５８））および電解質バインダー（ＤｕＰｏｎｔ社、５重量％”Ｎａｆｉｏｎ”（商品名）溶液）からなる触媒層を形成した。具体的には、一対の基材フィルム上に上記触媒および電解質バインダーからなる触媒層を形成した触媒転写フィルムで電解質膜を挟持し、熱プレス（温度：１３５−１５０℃、圧力：４−６ＭＰａ）により電解質膜上に触媒層を転写・形成した。さらに、上記電解質膜−触媒層接合体を一対のガス拡散層（東レ社製、カーボンペーパー）で挟持し、電解質膜−電極接合体を形成した。そして、上記電解質膜−電極接合体を燃料および酸化剤を供給するための流路を持つセパレータおよび集電体で挟持し、単セルを構成した。アノード極は１．１ｍｇ−Ｐｔ−Ｒｕ／ｃｍ2、カソード極は０．５ｍｇ−Ｐｔ／ｃｍ2とした。 (5) Power generation performance evaluation (hydrogen gas fuel)
Preparation of electrolyte membrane-catalyst layer assembly and electrolyte membrane-electrode assembly: Catalyst (Tanaka Kikinzoku Pt / C (TEC10E50E), Pt-) on both sides of the electrolyte membrane having a thickness of about 110 μm prepared in (1) above. A catalyst layer composed of Ru / C (TEC62E58)) and an electrolyte binder (DuPont, 5 wt% “Nafion” (trade name) solution) was formed. Specifically, the electrolyte membrane is sandwiched by a catalyst transfer film in which a catalyst layer composed of the above catalyst and electrolyte binder is formed on a pair of base films, and hot pressing (temperature: 135-150 ° C., pressure: 4-6 MPa) Thus, the catalyst layer was transferred and formed on the electrolyte membrane. Further, the electrolyte membrane-catalyst layer assembly was sandwiched between a pair of gas diffusion layers (manufactured by Toray Industries, Inc., carbon paper) to form an electrolyte membrane-electrode assembly. Then, the electrolyte membrane-electrode assembly was sandwiched between a separator having a flow path for supplying fuel and an oxidant and a current collector to constitute a single cell. The anode electrode 1.1mg-Pt-Ru / cm 2 , the cathode electrode was 0.5mg-Pt / cm 2.

燃料として水素ガス（０．１ＮＬＭ、露点８０℃）、酸化剤として空気（０．５ＮＬＭ、露点７０℃）をそれぞれ燃料極と空気極に供給し、８０℃で上記電解質膜−電極接合体の水素燃料電池の発電性能を評価した。得られた開放起電力は約１．０２Ｖであった。なお、上記「ＮＬＭ」とは、ｎｏｒｍａｌ ｌｉｔｅｒ ｐｅｒ ｍｉｎｕｔｅのことを指す。   Hydrogen gas (0.1 NLM, dew point 80 ° C.) as the fuel and air (0.5 NLM, dew point 70 ° C.) as the oxidant are supplied to the fuel electrode and the air electrode, respectively, and hydrogen of the above electrolyte membrane-electrode assembly at 80 ° C. The power generation performance of the fuel cell was evaluated. The obtained open electromotive force was about 1.02V. The “NLM” refers to a normal liter per minute.

比較例として、約１２５μｍの厚みを有する"Ｎａｆｉｏｎ１１５"膜を用いた単セルを同様
に評価したところ、開放起電力は０．９８Ｖであった。上記本実施例では、電解質膜の厚さは約１００μｍであり、"Ｎａｆｏｎ１１５"膜の厚さ（約１２５μｍ）に比べて２０％薄いにもか
かわらず、比較例に比べ４０ｍＶも高い開放起電力が得られた。これは、上記電解質膜が"Ｎａ
ｆｉｏｎ１１５"膜に比べて燃料ガスおよび酸化剤ガスのクロスリークに対するバリア性に優れ
ることを示している。 As a comparative example, when a single cell using a “Nafion 115” film having a thickness of about 125 μm was evaluated in the same manner, the open electromotive force was 0.98V. In the above embodiment, the electrolyte membrane has a thickness of about 100 μm, and although it is 20% thinner than the thickness of the “Nafon 115” membrane (about 125 μm), the open electromotive force is 40 mV higher than the comparative example. Obtained. This is because the electrolyte membrane is "Na
Compared to the fion 115 "film, the barrier property against cross leak of fuel gas and oxidant gas is excellent.

本発明は、上記実施形態に限定されるものではない。上記実施形態は、例示であり、本発明の特許請求の範囲に記載された技術的思想と実質的に同一な構成を有し、同様な作用効果を奏するものは、いかなるものであっても本発明の技術的範囲に包含される。   The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

図１Ａは本発明の一実施形態における自己組織化による造膜性のあるプロトン伝導性材料Ａの模式的斜視図、図１Ｂは同プロトン伝導性材料Ａが自己組織した膜の模式平面図、図１Ｃは図１Ｂの模式的断面図、図１Ｄは自己組織化による造膜性のある同プロトン伝導性材料Ａおよびプロトン伝導性材料Ｂからなる電解質膜の断面を示す模式図である。FIG. 1A is a schematic perspective view of a proton conductive material A having a film-forming property by self-organization according to one embodiment of the present invention, and FIG. 1B is a schematic plan view of a membrane in which the proton conductive material A is self-organized. 1C is a schematic cross-sectional view of FIG. 1B, and FIG. 1D is a schematic view showing a cross section of an electrolyte membrane made of the same proton conductive material A and proton conductive material B having a film-forming property by self-organization. 同、電解質膜−触媒層接合体の概略をあらわす断面図である。It is sectional drawing showing the outline of an electrolyte membrane-catalyst layer assembly as the same. 同、電解質膜−電極接合体の概略をあらわす断面図である。It is sectional drawing showing the outline of an electrolyte membrane electrode assembly similarly.

符号の説明Explanation of symbols

１ 電解質膜
２ 自己組織化による造膜性のあるプロトン伝導性材料Ａ
３ プロトン伝導性材料Ｂ
４，４’ 触媒層
５，７ 電極基材
６ 燃料極
８ 空気極 1 Electrolyte membrane 2 Proton-conducting material A with film-forming property by self-organization A
3 Proton conductive material B
4, 4 'catalyst layer 5, 7 electrode substrate 6 fuel electrode 8 air electrode

Claims (9)

プロトン伝導性材料Ａとプロトン伝導性材料Ｂとをプロトン伝導性材料として含む固体高分子形燃料電池用電解質膜であって、
前記プロトン伝導性材料Ａは、自己組織化による造膜性があることを特徴とする固体高分子形燃料電池用電解質膜。 An electrolyte membrane for a polymer electrolyte fuel cell, comprising proton conductive material A and proton conductive material B as proton conductive materials,
The electrolyte membrane for a polymer electrolyte fuel cell, wherein the proton conductive material A has a film-forming property by self-organization. 前記自己組織化による造膜性のあるプロトン伝導性材料Ａは前記電解質膜の２重量％〜５０重量％の範囲であり、前記プロトン伝導性材料Ａ以外のプロトン伝導性材料Ｂは前記電解質膜の５０重量％〜９８重量％の範囲である請求項１に記載の固体高分子形燃料電池用電解質膜。   The proton conductive material A having a film-forming property due to self-organization is in the range of 2 to 50% by weight of the electrolyte membrane, and the proton conductive material B other than the proton conductive material A is the electrolyte membrane. The electrolyte membrane for a polymer electrolyte fuel cell according to claim 1, wherein the electrolyte membrane is in the range of 50 wt% to 98 wt%. 前記プロトン伝導性材料Ａは、フッ素系プロトン伝導性高分子材料、炭化水素系プロトン伝導性材料、無機プロトン伝導性材料、有機−無機ハイブリッドプロトン伝導性材料およびこれらの混合物からなる群から選択される請求項１又は２に記載の固体高分子形燃料電池用電解質膜。   The proton conductive material A is selected from the group consisting of fluorine-based proton conductive polymer materials, hydrocarbon-based proton conductive materials, inorganic proton conductive materials, organic-inorganic hybrid proton conductive materials, and mixtures thereof. The electrolyte membrane for a polymer electrolyte fuel cell according to claim 1 or 2. 前記自己組織化による造膜性のあるプロトン伝導性材料Ａは、平均直径が０．０１μｍ〜１０．００μｍの範囲、平均厚みが０．０１〜１．００μｍの範囲の鱗片状材料である請求項１〜３のいずれか１項に記載の固体高分子形燃料電池用電解質膜。   The film-forming proton conductive material A by self-organization is a scaly material having an average diameter in the range of 0.01 μm to 10.00 μm and an average thickness in the range of 0.01 to 1.00 μm. The electrolyte membrane for polymer electrolyte fuel cells according to any one of 1 to 3. 前記自己組織化による造膜性のあるプロトン伝導性材料Ａは、前記プロトン伝導性材料Ｂにより厚さ０．０１μｍ〜１．００μｍで覆われている請求項１〜４のいずれか１項に記載の固体高分子形燃料電池用電解質膜。   5. The proton conductive material A having a film-forming property by self-assembly is covered with the proton conductive material B at a thickness of 0.01 μm to 1.00 μm. 6. Electrolyte membrane for polymer electrolyte fuel cell. 前記プロトン伝導性材料Ｂは、フッ素系プロトン伝導性高分子材料、炭化水素系プロトン伝導性材料、無機プロトン伝導性材料、有機−無機ハイブリッドプロトン伝導性材料、イオン液体およびこれらの混合物からなる群から選択される請求項１、２又は５に記載の固体高分子形燃料電池用電解質膜。   The proton conductive material B is selected from the group consisting of fluorine-based proton conductive polymer materials, hydrocarbon-based proton conductive materials, inorganic proton conductive materials, organic-inorganic hybrid proton conductive materials, ionic liquids, and mixtures thereof. 6. The electrolyte membrane for a polymer electrolyte fuel cell according to claim 1, 2 or 5. 請求項１〜６のいずれか１項に記載の電解質膜の両面に、それぞれ触媒粒子および電解質バインダーからなる触媒層が形成されていることを特徴とする電解質膜−触媒層接合体。   7. An electrolyte membrane-catalyst layer assembly, wherein catalyst layers comprising catalyst particles and an electrolyte binder are formed on both surfaces of the electrolyte membrane according to any one of claims 1 to 6. 請求項１〜６のいずれか１項に記載の電解質膜の両面に、それぞれ触媒粒子および電解質バインダーからなる触媒層と電極基材からなる電極が形成されていることを特徴とする電解質膜−電極接合体。   Electrolyte membrane-electrode, characterized in that a catalyst layer made of catalyst particles and an electrolyte binder and an electrode made of an electrode base material are formed on both surfaces of the electrolyte membrane according to any one of claims 1 to 6. Joined body. 請求項８に記載の電解質膜−電極接合体を用いた燃料電池。   A fuel cell using the electrolyte membrane-electrode assembly according to claim 8.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004281271A (en) * 2003-03-17 2004-10-07 Catalysts & Chem Ind Co Ltd Electrolyte film and fuel cell using the electrolyte film
WO2006054672A1 (en) * 2004-11-19 2006-05-26 Seimi Chemical Co., Ltd. Conductive thin film forming proton conductive composition, and proton conductive composite film
JP2007149642A (en) * 2005-11-02 2007-06-14 Dainippon Printing Co Ltd Electrolyte material for polymer electrolyte fuel cell, electrolyte membrane catalyst layer assembly and electrolyte membrane electrode assembly using the same, and fuel cell

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004281271A (en) * 2003-03-17 2004-10-07 Catalysts & Chem Ind Co Ltd Electrolyte film and fuel cell using the electrolyte film
WO2006054672A1 (en) * 2004-11-19 2006-05-26 Seimi Chemical Co., Ltd. Conductive thin film forming proton conductive composition, and proton conductive composite film
JP2007149642A (en) * 2005-11-02 2007-06-14 Dainippon Printing Co Ltd Electrolyte material for polymer electrolyte fuel cell, electrolyte membrane catalyst layer assembly and electrolyte membrane electrode assembly using the same, and fuel cell

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