JP4629699B2 - 担持触媒とその製造方法、これを利用した電極及び燃料電池 - Google Patents
担持触媒とその製造方法、これを利用した電極及び燃料電池 Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims description 380
- 239000000446 fuel Substances 0.000 title claims description 41
- 238000004519 manufacturing process Methods 0.000 title claims description 29
- 229910052751 metal Inorganic materials 0.000 claims description 73
- 239000002184 metal Substances 0.000 claims description 73
- 239000002243 precursor Substances 0.000 claims description 65
- 239000000203 mixture Substances 0.000 claims description 56
- 239000002245 particle Substances 0.000 claims description 55
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 44
- 230000009467 reduction Effects 0.000 claims description 41
- 229910052799 carbon Inorganic materials 0.000 claims description 39
- 239000002923 metal particle Substances 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 36
- 239000002904 solvent Substances 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 230000003197 catalytic effect Effects 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 15
- 239000012018 catalyst precursor Substances 0.000 claims description 14
- 239000001257 hydrogen Substances 0.000 claims description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims description 13
- 150000005846 sugar alcohols Polymers 0.000 claims description 13
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 6
- 239000010410 layer Substances 0.000 description 121
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 48
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 47
- 238000006722 reduction reaction Methods 0.000 description 42
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 36
- 229910002849 PtRu Inorganic materials 0.000 description 35
- 230000000052 comparative effect Effects 0.000 description 25
- 239000012528 membrane Substances 0.000 description 20
- 239000000243 solution Substances 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 239000011148 porous material Substances 0.000 description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 12
- 239000002253 acid Substances 0.000 description 12
- 239000003792 electrolyte Substances 0.000 description 12
- 239000012071 phase Substances 0.000 description 12
- 229910052697 platinum Inorganic materials 0.000 description 12
- 239000007789 gas Substances 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 9
- 239000007791 liquid phase Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000007731 hot pressing Methods 0.000 description 7
- -1 hydrogen ions Chemical class 0.000 description 7
- 150000002500 ions Chemical class 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 7
- 229920000557 Nafion® Polymers 0.000 description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 6
- 239000010931 gold Substances 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 230000010718 Oxidation Activity Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 229920000554 ionomer Polymers 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 229910003771 Gold(I) chloride Inorganic materials 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000012153 distilled water Substances 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- FDWREHZXQUYJFJ-UHFFFAOYSA-M gold monochloride Chemical compound [Cl-].[Au+] FDWREHZXQUYJFJ-UHFFFAOYSA-M 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- 239000010948 rhodium Substances 0.000 description 4
- 229910052707 ruthenium Inorganic materials 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910003481 amorphous carbon Inorganic materials 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- YBCAZPLXEGKKFM-UHFFFAOYSA-K ruthenium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Ru+3] YBCAZPLXEGKKFM-UHFFFAOYSA-K 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000012808 vapor phase Substances 0.000 description 3
- 241000872198 Serjania polyphylla Species 0.000 description 2
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 2
- 125000002947 alkylene group Chemical group 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
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- 239000010419 fine particle Substances 0.000 description 2
- 229920002313 fluoropolymer Polymers 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- 239000003273 ketjen black Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052762 osmium Inorganic materials 0.000 description 2
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000005518 polymer electrolyte Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 125000000542 sulfonic acid group Chemical group 0.000 description 2
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000029936 alkylation Effects 0.000 description 1
- 238000005804 alkylation reaction Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004517 catalytic hydrocracking Methods 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006114 decarboxylation reaction Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000006317 isomerization reaction Methods 0.000 description 1
- 239000011254 layer-forming composition Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000012685 metal catalyst precursor Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
- H01M4/925—Metals of platinum group supported on carriers, e.g. powder carriers
- H01M4/926—Metals of platinum group supported on carriers, e.g. powder carriers on carbon or graphite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/16—Reducing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/8647—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites
- H01M4/8657—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites layered
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8803—Supports for the deposition of the catalytic active composition
- H01M4/8814—Temporary supports, e.g. decal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8825—Methods for deposition of the catalytic active composition
- H01M4/8846—Impregnation
- H01M4/885—Impregnation followed by reduction of the catalyst salt precursor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1007—Fuel cells with solid electrolytes with both reactants being gaseous or vaporised
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
- H01M4/921—Alloys or mixtures with metallic elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1009—Fuel cells with solid electrolytes with one of the reactants being liquid, solid or liquid-charged
- H01M8/1011—Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
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- 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
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- Y02E60/50—Fuel cells
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- 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
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- Catalysts (AREA)
- Inert Electrodes (AREA)
- Fuel Cell (AREA)
Description
触媒金属前駆体であるヘキサクロロ白金酸(H2PtCl6・xH2O)0.89gと、塩化ルテニウム(RuCl3・xH2O)0.40gとをアセトン2.5mlにそれぞれ溶解して、対応する金属前駆体混合物を得た後、これを炭素担体であるメソポーラス炭素1gが入っているビニール袋に含浸した。これを電気炉に入れて水素を流しつつ、還元処理気相還元を実施して、35質量%のPtRuが担持された触媒(第1担持触媒)を製造した。
触媒金属前駆体であるPt塩化物のヘキサクロロ白金酸(H2PtCl6・xH2O)1.08gをアセトン3mlに溶解して、対応する金属前駆体混合物を得た後、これを炭素担体であるメソポーラス炭素1gが入っているビニール袋に含浸した。これを電気炉に入れて水素を流しつつ、還元処理(気相還元)を実施して30質量%のPtが担持された触媒(第1担持触媒)を製造した。
触媒金属前駆体であるヘキサクロロ白金酸(H2PtCl6・xH2O)1gと塩化ルテニウム(RuCl3・xH2O)0.474gとを3次蒸溜水100gに溶解して、対応する金属前駆体混合物を得た後、これを炭素担体であるメソポーラス炭素がエチレングリコールに分散された炭素担体混合物に混合し、全体混合物のpHを13に調整した後、110℃に昇温して溶液相で金属イオンを還元した。
触媒金属前駆体であるPt塩化物のヘキサクロロ白金酸(H2PtCl6・xH2O)1.8844gをアセトン3mlに溶解して、対応する金属前駆体混合物を得た後、これを炭素担体であるメソポーラス炭素1gが入っているビニール袋に含浸した。これを電気炉に入れて水素を流しつつ還元処理(気相還元)を実施して、47.5質量%のPt/MC担持触媒を製造した。前記の製造されたPt/MC触媒をビニール袋にさらに入れ、ヘキサクロロ白金酸(H2PtCl6・xH2O)1.8844gをアセトン6mlに溶解して、対応する金属前駆体混合物を得た後、混合して2次で含浸した。これを電気炉にさらに入れて水素を流しつつ2次還元処理(気相還元)を実施して、最終的に60質量%のPt/MC触媒を製造した。
炭素担体であるメソポーラス炭素1gを水400gとエチレングリコール40gとに分散させる。ここに触媒金属前駆体であるPt塩化物のヘキサクロロ白金酸(H2PtCl6・xH2O)3.7688gをエチレングリコール360gに溶解して、金属前駆体混合物を得、前記の両溶液を10分間混合した。全体混合物のpHを11に調節した後、110℃に昇温して溶液相で金属イオンを還元した。
前記実施例1によって得た70wt%PtRu/MC担持触媒1.5gを脱イオン水2g、エチレングリコール1g、及び20wt%ナフィオンアイオノマー溶液2.25gに混合して製造した触媒層形成用のスラリーを製造した。
アノード触媒層がPtRuブラック非担持触媒のみで製造されたことを除いては、実施例3と同じ方法でMEAを形成した。
アノード触媒層が実施例4と同じ方法で製造されたPtRuブラック非担持触媒層を利用し、カソード触媒層は、Ptブラック非担持触媒で製造された触媒層を使用したことを除いては、実施例3と同じ過程で実施した。
31、31’ 支持膜
32、42 カソード触媒層
33、34 触媒層
35、45 アノード触媒層
36 CCM
37、47 カソード拡散層
37’、47’ アノード拡散層
38、38’ バッキング層
39、49 MEA
43 第2触媒層
44 第1触媒層
48、48’ カーボン紙
Claims (13)
- 燃料電池用電極に用いる担持触媒の製造方法であって、
(a)第1触媒金属前駆体と第1溶媒とを混合して、第1触媒金属前駆体混合物を得る段階と、
(b)炭素系触媒担体と前記第1触媒金属前駆体混合物とを混合し、これを1次乾燥して1次担持触媒前駆体を得る段階と、
(c)前記1次担持触媒前駆体を水素還元熱処理して、1次担持触媒を得る段階と、
(d)前記1次担持触媒と多価アルコールとを混合して、1次担持触媒混合物を得る段階と、
(e)第2触媒金属前駆体と第2溶媒とを混合して、第2触媒金属前駆体混合物を得る段階と、
(f)前記(d)段階で得た1次担持触媒混合物と、前記(e)段階で得た第2触媒金属前駆体混合物とを混合して、2次担持触媒前駆体混合物を得る段階と、
(g)前記2次担持触媒前駆体混合物のpHを調整した後、これを加熱して担持触媒を得る段階と、
を含むことを特徴とする、担持触媒の製造方法。 - 前記(a)段階において、前記第1触媒金属前駆体の含有量は、前記第1触媒金属前駆体混合物100質量部を基準として、20〜40質量部であることを特徴とする、請求項1に記載の担持触媒の製造方法。
- 前記(c)段階において、前記水素還元熱処理の温度は、100〜300℃であることを特徴とする、請求項1に記載の担持触媒の製造方法。
- 前記(d)段階において、前記多価アルコールの含有量は、前記1次担持触媒100質量部を基準として、3,000〜52,000質量部であることを特徴とする、請求項1に記載の担持触媒の製造方法。
- 前記(a)〜(g)段階によって最終的に得られる担持触媒において、触媒金属粒子の担持量は、担持触媒100質量部を基準として40〜90質量部であり、
前記1次担持触媒において、触媒金属粒子の含有量は、最終的に得られた担持触媒における触媒金属粒子総担持量の20〜45質量%であり、
前記(g)段階によって得られた担持触媒において、触媒金属粒子の含有量は、最終的に得られた担持触媒における触媒金属粒子総担持量の20〜70質量%であることを特徴とする、請求項1に記載の担持触媒の製造方法。 - 前記(e)段階において、前記第2触媒金属前駆体混合物のうち前記第2触媒金属前駆体の含有量は、前記第2触媒金属前駆体混合物100質量部を基準として、0.2〜0.8質量部であることを特徴とする、請求項1に記載の担持触媒の製造方法。
- 前記(g)段階において、pHは、7〜14であり、加熱温度は、90〜115℃であることを特徴とする、請求項1に記載の担持触媒の製造方法。
- 請求項1から請求項7のうちいずれか一項に記載の製造方法によって製造された燃料電池用電極の担持触媒。
- 前記担持触媒は、平均粒径が1〜5nmである触媒金属粒子を含有し、前記触媒金属粒子の含有量は、前記担持触媒100質量部を基準として40〜90質量部であることを特徴とする、請求項8に記載の担持触媒。
- 請求項8に記載の担持触媒を含む燃料電池用電極。
- 前記担持触媒は、平均粒径が1〜5nmである触媒金属粒子を含有し、前記触媒金属粒子の含有量は、前記担持触媒100質量部を基準として40〜90質量部であることを特徴とする、請求項10に記載の燃料電池用電極。
- 請求項8に記載の担持触媒を含む燃料電池用電極を備える燃料電池。
- 前記担持触媒は、平均粒径が1〜5nmである触媒金属粒子を含有し、前記触媒金属粒子の含有量は、前記担持触媒100質量部を基準として40〜90質量部であることを特徴とする、請求項12に記載の燃料電池。
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