CN110479250A - 一种基于还原性气体辅助制备一维铂基纳米材料的方法 - Google Patents
一种基于还原性气体辅助制备一维铂基纳米材料的方法 Download PDFInfo
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- CN110479250A CN110479250A CN201910818258.5A CN201910818258A CN110479250A CN 110479250 A CN110479250 A CN 110479250A CN 201910818258 A CN201910818258 A CN 201910818258A CN 110479250 A CN110479250 A CN 110479250A
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 161
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 72
- 239000002086 nanomaterial Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 40
- 239000000843 powder Substances 0.000 claims abstract description 30
- 238000002360 preparation method Methods 0.000 claims abstract description 30
- 239000007787 solid Substances 0.000 claims abstract description 27
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 16
- 238000006722 reduction reaction Methods 0.000 claims abstract description 14
- 239000010953 base metal Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 10
- 239000011261 inert gas Substances 0.000 claims abstract description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims description 12
- 239000001257 hydrogen Substances 0.000 claims description 12
- 229910052700 potassium Inorganic materials 0.000 claims description 12
- 239000011591 potassium Substances 0.000 claims description 12
- 239000002105 nanoparticle Substances 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000001291 vacuum drying Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- DKAGJZJALZXOOV-UHFFFAOYSA-N hydrate;hydrochloride Chemical compound O.Cl DKAGJZJALZXOOV-UHFFFAOYSA-N 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 239000012052 hydrophilic carrier Substances 0.000 claims description 4
- OQUOOEBLAKQCOP-UHFFFAOYSA-N nitric acid;hexahydrate Chemical compound O.O.O.O.O.O.O[N+]([O-])=O OQUOOEBLAKQCOP-UHFFFAOYSA-N 0.000 claims description 4
- 239000002243 precursor Substances 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 4
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 4
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 4
- 229960001763 zinc sulfate Drugs 0.000 claims description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- GFHNAMRJFCEERV-UHFFFAOYSA-L cobalt chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Co+2] GFHNAMRJFCEERV-UHFFFAOYSA-L 0.000 claims description 3
- XAYGUHUYDMLJJV-UHFFFAOYSA-Z decaazanium;dioxido(dioxo)tungsten;hydron;trioxotungsten Chemical compound [H+].[H+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O XAYGUHUYDMLJJV-UHFFFAOYSA-Z 0.000 claims description 3
- LAIZPRYFQUWUBN-UHFFFAOYSA-L nickel chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Ni+2] LAIZPRYFQUWUBN-UHFFFAOYSA-L 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- MPTQRFCYZCXJFQ-UHFFFAOYSA-L copper(II) chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Cu+2] MPTQRFCYZCXJFQ-UHFFFAOYSA-L 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- ZXAUZSQITFJWPS-UHFFFAOYSA-J zirconium(4+);disulfate Chemical compound [Zr+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZXAUZSQITFJWPS-UHFFFAOYSA-J 0.000 claims description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims 1
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000005660 chlorination reaction Methods 0.000 claims 1
- 239000000460 chlorine Substances 0.000 claims 1
- 229910052801 chlorine Inorganic materials 0.000 claims 1
- 230000036571 hydration Effects 0.000 claims 1
- 238000006703 hydration reaction Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 14
- 238000012512 characterization method Methods 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 239000003054 catalyst Substances 0.000 abstract description 6
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 238000003786 synthesis reaction Methods 0.000 abstract description 4
- 239000007791 liquid phase Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002082 metal nanoparticle Substances 0.000 abstract description 3
- 239000003607 modifier Substances 0.000 abstract description 2
- 239000010970 precious metal Substances 0.000 abstract description 2
- 239000002070 nanowire Substances 0.000 description 52
- 230000005540 biological transmission Effects 0.000 description 16
- 239000013078 crystal Substances 0.000 description 15
- PCLURTMBFDTLSK-UHFFFAOYSA-N nickel platinum Chemical compound [Ni].[Pt] PCLURTMBFDTLSK-UHFFFAOYSA-N 0.000 description 11
- 238000002604 ultrasonography Methods 0.000 description 10
- 238000007790 scraping Methods 0.000 description 9
- 239000003643 water by type Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- CLBRCZAHAHECKY-UHFFFAOYSA-N [Co].[Pt] Chemical compound [Co].[Pt] CLBRCZAHAHECKY-UHFFFAOYSA-N 0.000 description 4
- 125000004429 atom Chemical group 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000001603 reducing effect Effects 0.000 description 4
- 229910000990 Ni alloy Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 241000209094 Oryza Species 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000002242 deionisation method Methods 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 235000012149 noodles Nutrition 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- PHRFTVNCIUXJIY-UHFFFAOYSA-N platinum scandium Chemical compound [Sc].[Pt].[Pt] PHRFTVNCIUXJIY-UHFFFAOYSA-N 0.000 description 3
- SKJKDBIPDZJBPK-UHFFFAOYSA-N platinum zinc Chemical compound [Zn].[Pt] SKJKDBIPDZJBPK-UHFFFAOYSA-N 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910021626 Tin(II) chloride Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000000396 iron Nutrition 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- ZONODCCBXBRQEZ-UHFFFAOYSA-N platinum tungsten Chemical compound [W].[Pt] ZONODCCBXBRQEZ-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 1
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical class O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 description 1
- DSVGQVZAZSZEEX-UHFFFAOYSA-N [C].[Pt] Chemical compound [C].[Pt] DSVGQVZAZSZEEX-UHFFFAOYSA-N 0.000 description 1
- CMHKGULXIWIGBU-UHFFFAOYSA-N [Fe].[Pt] Chemical compound [Fe].[Pt] CMHKGULXIWIGBU-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- -1 platinoid Chemical compound 0.000 description 1
- FHMDYDAXYDRBGZ-UHFFFAOYSA-N platinum tin Chemical compound [Sn].[Pt] FHMDYDAXYDRBGZ-UHFFFAOYSA-N 0.000 description 1
- UQWLEJDCBWVKSN-UHFFFAOYSA-N platinum zirconium Chemical compound [Zr].[Pt] UQWLEJDCBWVKSN-UHFFFAOYSA-N 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001507 sample dispersion Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid group Chemical class S(O)(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 238000007704 wet chemistry method Methods 0.000 description 1
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- B01J23/60—Platinum group metals with zinc, cadmium or mercury
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- B01J23/62—Platinum group metals with gallium, indium, thallium, germanium, tin or lead
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- B01J23/56—Platinum group metals
- B01J23/64—Platinum group metals with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/652—Chromium, molybdenum or tungsten
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Abstract
本发明涉及一种基于还原性气体辅助制备一维铂基纳米材料的方法,包括以下步骤:(1)取水溶性的贵金属铂前驱体与水溶性非贵金属前驱体共溶,真空干燥,即得到均匀混合的双金属前驱体固体粉末;(2)将步骤(1)所制得的双金属前驱体固体粉末置于反应器中,采用惰性气体排空反应器中空气后,引入还原性气体,加热进行还原反应,所得还原产物洗涤后,即制得一维铂基纳米材料。与现有技术相比,本发明利用气体分子在贵金属表面的吸附特性,实现了贵金属纳米颗粒的可控生长,摆脱了有机修饰剂对催化剂性能的影响,同时气固反应的制备方法与传统液相合成相比,将更适用于批量催化剂的工业化生产。
Description
技术领域
本发明属于纳米材料制备技术领域,涉及一种基于还原性气体辅助制备一维铂基纳米材料的方法。
背景技术
一维纳米材料在热稳定性,电子传输和光学等方面拥有突出性能。尤其是,一维铂基纳米线相对于零维纳米颗粒而言,其高柔软性,良好的导电性以及优异的稳定性在电催化方面表现出优异的性能。然而,目前关于一维铂基纳米线的制备方法主要以液相制备为主,且引入了大量有机试剂,除对产物的催化性能有一定影响之外,复杂的制备及洗涤工艺,限制了大规模产业化生产。
如中国专利ZL 201710801814.9公开的一种铂铜纳米线材料的制备方法中,以铜源为原料,氢氧化钠溶液为溶剂,水合肼溶液为还原剂,水浴反应0.8-1小时制备得到铜纳米线,再以铜纳米线为模板,利用铜和贵金属铂之间的活性差异,采用液相置换法,由铜纳米线与氯铂酸溶液发生置换反应得到铂铜纳米线材料。其虽然可以较好的制备铂铜纳米线材料,但是,仍存在上述提到的制备洗涤工艺较为复杂,难以规模化应用的问题。
发明内容
本发明的目的就是为了克服上述现有技术存在的缺陷而提供一种基于还原性气体辅助制备一维铂基纳米材料的方法。利用气体分子在贵金属表面的吸附特性,实现了贵金属纳米颗粒的可控生长,摆脱了有机修饰剂对催化剂性能的影响,同时气固反应的制备方法与传统液相合成相比,将更适用于批量催化剂的工业化生产。
本发明的目的可以通过以下技术方案来实现:
一种基于还原性气体辅助制备一维铂基纳米材料的方法,一维铂基纳米材料为一维铂纳米材料或一维铂基双金属纳米材料,其中,
所述一维铂纳米材料的制备过程具体为:取贵金属铂前驱体粉末置于反应器中,采用惰性气体排空反应器中空气后,引入还原性气体,加热进行还原反应,所得还原产物洗涤后,即制得一维铂纳米材料;
所述一维铂基双金属纳米材料的制备过程包括以下步骤:
(1)取水溶性的贵金属铂前驱体与水溶性非贵金属前驱体共溶,真空干燥,即得到均匀混合的双金属前驱体固体粉末;
(2)将步骤(1)所制得的双金属前驱体固体粉末置于反应器中,采用惰性气体排空反应器中空气后,引入还原性气体,加热进行还原反应,所得还原产物洗涤后,即制得一维铂基双金属纳米材料。
进一步的,步骤(1)中,贵金属铂前驱体与非贵金属前驱体共溶前,还可加入亲水性载体材料,直接得到负载于载体的双金属前驱体固体粉末,进而通过步骤(2)制得负载于载体的一维铂基纳米材料。
更进一步的,所述亲水性载体材料包括亲水碳粉或亲水二氧化钛纳米颗粒。其中,亲水二氧化钛纳米颗粒优选购自Sigma-Aldrich,锐钛矿,~25纳米,纯度99.7%。亲水碳粉优选为商业碳粉XC-72R通过酸洗处理得到。酸洗处理过程具体如下:(1)取一50毫升容量的单口圆底烧瓶,依次加入15毫升浓硫酸,5毫升浓硝酸,200毫克碳粉,置于一冷水浴中,搅拌20分钟;(2)酸洗之后,将碳粉用去离子水洗涤,直至上清液的pH值接近中性即可。
进一步的,步骤(1)中,所述贵金属铂前驱体为氯亚铂酸钾,非贵金属前驱体为六水合氯化镍、六水合氯化亚铁、六水合氯化钴、六水合硝酸钴、六水合氯化钪、二水合氯化铜、硫酸锌、硫酸锆、氯化锡或仲钨酸铵。
进一步的,步骤(1)中,贵金属铂前驱体与非贵金属前驱体共溶所用溶剂为去离子水,真空干燥的温度为60℃。
进一步的,步骤(2)中,所述惰性气体为氮气或氩气。
进一步的,步骤(2)中,所述还原性气体为氢气,利用氢气的强还原性以及在贵金属铂纳米颗粒不同晶面的吸附特点,实现纳米颗粒生长过程中的定向连接,可得到一维铂基纳米线;若通入一氧化碳与氢气的混合气体,产物倾向于球形纳米颗粒。
进一步的,步骤(2)中,加热还原反应的温度为300℃±50℃。
进一步的,步骤(2)中,还原产物洗涤为采用去离子水洗涤。
进一步的,步骤(2)中,双金属前驱体固体粉末置于反应器中的位置保证双金属前驱体固体粉末与后续通入的还原性气体接触充分。
本发明中,铂纳米颗粒在表面原子扩散作用下实现了特定晶面定向连接的形成机制为:氢气的吸附可以增强纳米颗粒表面铂原子的扩散速率,尤其是在氢气吸附最强的铂{100}晶面,铂原子的表面扩散速率显著增强,使得颗粒之间的连接也更倾向于发生在具有高表面扩散速率的铂{100}晶面。铂基纳米线的固相合成过程主要包括了以下四个阶段:(1)氢气在铂{100}晶面的优先吸附;(2)铂{100}晶面的表面扩散速率增强;(3)铂纳米颗粒{100}晶面之间的接触及颗粒之间颈缩区的形成;(4)纳米颗粒之间实现{100}晶面的定向连接及纳米短链的初步形成。
本发明中,优选的还原温度为300℃±50℃,还原温度过低不利于非贵金属前驱体的还原及与贵金属铂的合金化;还原温度过高易造成一维铂基纳米线的烧结团聚现象,从而影响其电催化性能。
本发明采用氢气等还原性气体辅助,如利用氢气分子在贵金属纳米颗粒不同晶面的吸附特点,通过气固反应实现了一维铂基纳米线的制备。制备工艺简单,产物催化性能优异。
与现有技术相比,本发明具有以下优点:
(1)本发明采用氢气等还原气体辅助,通过气固两相反应制备一维铂基纳米线,工艺简单。
(2)本发明避免了传统湿法化学制备铂基纳米线中有机试剂的使用,绿色环保。
(3)本发明适用于自支撑铂基纳米线的制备又适用于负载于载体的铂基纳米线的制备。
(4)本发明方法产物的洗涤过程简单,无需特殊处理,催化剂表面洁净度高。
(5)本发明方法适用于大规模批量制备,可应用于工业生产。
附图说明
图1为自支撑铂纳米线的透射电镜照片;
图2为自支撑铂镍纳米线的透射电镜照片;
图3为自支撑铂铁、铂钴、铂钪、铂铜、铂锌、铂锆、铂锡、铂钨的低倍透射电镜照片;
图4为负载于二氧化钛的铂纳米线及铂镍纳米线的透射电镜照片;
图5为铂纳米线及铂镍纳米线的电催化氧还原性能;
图6为反应器的结构示意图。
具体实施方式
下面结合附图和具体实施例对本发明进行详细说明。本实施例以本发明技术方案为前提进行实施,给出了详细的实施方式和具体的操作过程,但本发明的保护范围不限于下述的实施例。
以下各实施例中所采用的反应器可以参见图6所示,具体为一钢制管状结构的反应器,其内部可安置放置双金属前驱体固体粉末2的石英舟,并可置于管式炉中以提供合适温度,反应器的两端分别连接进气管路和排气管路,且前端的三通阀用于切换气体,并保证在进行还原反应前,可切换至通入还原性气体1。当然,也可以采用其他可保证提供保护气体氛围与加热环境的其余类型的反应器。
以下各实施例中,其余未具体说明的原料产品或处理技术,则表明均为本领域的常规市售原料或常规处理技术。
实施例1:
自支撑一维纯铂纳米线的制备
(1)将41.51毫克的氯亚铂酸钾粉末平铺于石英舟中,使粉末能够充分与反应器中通入的气体接触。
(3)向反应器中引入氩气,15分钟后待反应器中空气排净后,引入百分之五的氢氩混合气,流速为氢气/氩气(10/190)毫升/分钟。同时,以10摄氏度/分钟的升温速率从室温升到250摄氏度,保温30分钟后,自然降温至室温。
(4)反应结束后,通入氩气将反应器中残留的氢气排净。取出还原之后的固体粉末,用去离子水分散,超声之后离心,此洗涤过程重复两遍之后,再次将样品分散于无水乙醇中保存备用。
实施例2:
自支撑一维铂镍纳米线的制备
(1)将41.51毫克的氯亚铂酸钾和23.77毫克的六水合氯化镍共溶于5毫升去离子水中,超声10分钟后置于真空烘箱,在60摄氏度下将水分蒸干,随即刮取得到预反应物的双金属前驱体固体粉末。
(2)将上述双金属前驱体固体粉末平铺于石英舟中,使粉末能够充分与反应器中通入的气体接触。
(3)其余步骤与实施例1中一致。
实施例3:
自支撑一维铂铁纳米线的制备
(1)将41.51毫克的氯亚铂酸钾和19.88毫克的六水合氯化亚铁共溶于5毫升去离子水中,超声10分钟后置于真空烘箱,在60摄氏度下将水分蒸干,随即刮取得到预反应物的固体粉末。
(2)其余步骤与实施例2中一致。
实施例4:
自支撑一维铂钴纳米线的制备(1)将41.51毫克的氯亚铂酸钾和23.79毫克的六水合氯化钴或者29.10毫克的六水合硝酸钴共溶于5毫升去离子水中,超声10分钟后置于真空烘箱,在60摄氏度下将水分蒸干,随即刮取得到预反应物的固体粉末。
(2)其余步骤与实施例2中一致。实验结果测试表明,将步骤(2)中温度参数250摄氏度调整为200摄氏度和300摄氏度对铂钴纳米线的形貌几乎没有影响。
实施例5:
自支撑一维铂钪纳米线的制备
(1)将41.51毫克的氯亚铂酸钾、8.56毫克的六水合氯化钪和5mL稀释后浓度为1mol/L盐酸(抑制六水合氯化钪的水解)共溶于5毫升去离子水中,超声10分钟后置于真空烘箱,在60摄氏度下将水分蒸干,随即刮取得到预反应物的固体粉末。
(2)其余步骤与实施例2中一致。
实施例6:
自支撑一维铂铜纳米线的制备
(1)将41.51毫克的氯亚铂酸钾和8.06毫克的二水合氯化铜共溶于5毫升去离子水中,超声10分钟后置于真空烘箱,在60摄氏度下将水分蒸干,随即刮取得到预反应物的固体粉末。
(2)其余步骤与实施例2中一致。
实施例7:
自支撑一维铂锌纳米线的制备
(1)将41.51毫克的氯亚铂酸钾、5.38毫克的硫酸锌和5mL稀释后浓度为1mol/L盐酸(抑制硫酸锌的水解)共溶于5毫升去离子水中,超声10分钟后置于真空烘箱,在60摄氏度下将水分蒸干,随即刮取得到预反应物的固体粉末。
(2)其余步骤与实施例2中一致。
实施例8:
自支撑一维铂锡纳米线的制备
(1)将41.51毫克的氯亚铂酸钾、6.32毫克的SnCl2和5mL稀释后浓度为1mol/L盐酸(抑制SnCl2的水解)共溶于5毫升去离子水中,超声10分钟后置于真空烘箱,在60摄氏度下将水分蒸干,随即刮取得到预反应物的固体粉末。
(2)其余步骤与实施例2中一致。
实施例9:
自支撑一维铂钨纳米线的制备
(1)将41.51毫克的氯亚铂酸钾和6.13毫克的仲钨酸铵共溶于5毫升去离子水中,超声10分钟后置于真空烘箱,在60摄氏度下将水分蒸干,随即刮取得到预反应物的固体粉末。
(2)其余步骤与实施例2中一致。
实施例10:
二氧化钛支撑一维铂镍纳米线的制备
(1)将41.51毫克的氯亚铂酸钾和23.77毫克的六水合氯化镍共溶于5毫升去离子水中,加入80毫克的二氧化钛纳米粉体颗粒,超声10分钟后置于真空烘箱,在60摄氏度下将水分蒸干,随即刮取得到预反应物的固体粉末。
(2)其余步骤与实施例2中一致。
图1为实例1制得的纯铂纳米线的形貌和结构表征。图1-1为一簇铂纳米线的低倍透射电镜表征,单根铂纳米线的直径约为3纳米。图1-2为单根铂纳米线的高分辨透射电镜表征,0.226纳米的晶面间距对应于具有面心立方晶体结构的铂纳米晶体的(111)晶面。图1-3为原子分辨率的高角环形暗场-扫描透射电镜表征,插图中的傅里叶变换表明了铂纳米线的单晶特征。图1-4为图1-3中选框区域的放大图。
图2为实施例2制得的铂镍纳米线的形貌,结构及成分表征。图2-1的低倍透射电镜表征证明,与纯铂纳米线相似,其直径约为3纳米。图2-2的高分辨透射电镜表征中,其晶面间距为0.211纳米对应于铂镍合金纳米线的(111)晶面,其间距略小于纯铂纳米线。图2-3的高角环形暗场-扫描透射电镜表征表明了铂镍纳米线表面具有由{111}和{100}晶面组成的台阶及裸露晶面。插图的傅里叶变换证明了铂镍合金纳米线的单晶特征。图2-4的元素能谱分析图表明了铂、镍两种元素均匀分布于纳米线中。
图3中3-1对应于实施例3制得的铂铁纳米线的低倍透射电镜图片;3-2和3-3对应于施例4分别应用六水合氯化钴或者六水合硝酸钴作为前驱体制得的铂钴纳米线的低倍透射电镜图片;3-4对应于施例5制得的铂钪纳米线的低倍透射电镜图片;3-5对应于施例6制得的铂铜纳米线的低倍透射电镜图片;3-6对应于施例7制得的铂锌纳米线的低倍透射电镜图片;3-7对应于施例8制得的铂锡纳米线的低倍透射电镜图片;3-8对应于施例9制得的铂钨纳米线的低倍透射电镜图片;表明了本发明涉及的制备方法可以适用于多种一维铂基纳米线的合成。
图4中4-1和4-2分别对应于实施例10制得的负载于二氧化钛载体的铂纳米线及铂镍纳米线,表明了本发明涉及的制备方法同样可以适用于负载于载体的一维铂基纳米线的合成。
图5为实例1制得的纯铂纳米线及实施例2制得的铂镍纳米线的电催化氧还原性能。该方法制备的铂纳米线及铂镍合金纳米线相比商业铂碳的电催化氧还原性能,质量活性分别提高了5.1倍和10.9倍,面积活性分别提高了8.5倍和13.8倍;此外,经过10000个循环伏安扫描后,质量活性的最低损失只有2.6%,表现出了酸性条件下优异的稳定性。
以上各实施例中,加热进行还原反应的温度还可以调整为300℃、350℃。
上述的对实施例的描述是为便于该技术领域的普通技术人员能理解和使用发明。熟悉本领域技术的人员显然可以容易地对这些实施例做出各种修改,并把在此说明的一般原理应用到其他实施例中而不必经过创造性的劳动。因此,本发明不限于上述实施例,本领域技术人员根据本发明的揭示,不脱离本发明范畴所做出的改进和修改都应该在本发明的保护范围之内。
Claims (10)
1.一种基于还原性气体辅助制备一维铂基纳米材料的方法,其特征在于,一维铂基纳米材料为一维铂纳米材料或一维铂基双金属纳米材料,其中,
所述一维铂纳米材料的制备过程具体为:取贵金属铂前驱体粉末置于反应器中,采用惰性气体排空反应器中空气后,引入还原性气体,加热进行还原反应,所得还原产物洗涤后,即制得一维铂纳米材料;
所述一维铂基双金属纳米材料的制备过程包括以下步骤:
(1)取水溶性的贵金属铂前驱体与水溶性非贵金属前驱体共溶,真空干燥,即得到均匀混合的双金属前驱体固体粉末;
(2)将步骤(1)所制得的双金属前驱体固体粉末置于反应器中,采用惰性气体排空反应器中空气后,引入还原性气体,加热进行还原反应,所得还原产物洗涤后,即制得一维铂基双金属纳米材料。
2.根据权利要求1所述的一种基于还原性气体辅助制备铂基纳米材料的方法,其特征在于,步骤(1)中,贵金属铂前驱体与非贵金属前驱体共溶的同时,还可加入亲水性载体材料,直接得到负载于亲水性载体材料上的双金属前驱体固体粉末,再通过步骤(2)制得一维铂基纳米材料。
3.根据权利要求2所述的一种基于还原性气体辅助制备一维铂基纳米材料的方法,其特征在于,所述亲水性载体材料包括亲水碳粉或亲水二氧化钛纳米颗粒。
4.根据权利要求1所述的一种基于还原性气体辅助制备一维铂基纳米材料的方法,其特征在于,所述贵金属铂前驱体为氯亚铂酸钾,非贵金属前驱体为六水合氯化镍、六水合氯化亚铁、六水合氯化钴、六水合硝酸钴、六水合氯化钪、二水合氯化铜、硫酸锌、硫酸锆、氯化锡或仲钨酸铵。
5.根据权利要求1所述的一种基于还原性气体辅助制备一维铂基纳米材料的方法,其特征在于,步骤(1)中,贵金属铂前驱体与非贵金属前驱体共溶所用溶剂为去离子水,真空干燥的温度为60℃。
6.根据权利要求1所述的一种基于还原性气体辅助制备一维铂基纳米材料的方法,其特征在于,所述惰性气体为氮气或氩气。
7.根据权利要求1所述的一种基于还原性气体辅助制备一维铂基纳米材料的方法,其特征在于,所述还原性气体为氢气。
8.根据权利要求1所述的一种基于还原性气体辅助制备一维铂基纳米材料的方法,其特征在于,加热进行还原反应的温度为300℃±50℃。
9.根据权利要求1所述的一种基于还原性气体辅助制备一维铂基纳米材料的方法,其特征在于,还原产物洗涤为采用去离子水洗涤。
10.根据权利要求1所述的一种基于还原性气体辅助制备一维铂基纳米材料的方法,其特征在于,贵金属铂前驱体粉末或双金属前驱体固体粉末置于反应器中的位置保证其与后续通入的还原性气体接触充分。
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