High utilization supported catalytic metal-containing gas-diffusion electrode, process for making it, and cells utilizin
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C25D-005/00
C25B-011/04
출원번호
US-0560206
(1990-07-31)
발명자
/ 주소
Reddy N. R. K. Vilambi (Salem NH) Anderson Everett B. (Reading MA) Taylor Earl J. (Chelmsford MA)
출원인 / 주소
Physical Sciences Inc. (Andover MA 02)
인용정보
피인용 횟수 :
83인용 특허 :
0
초록▼
Gas-diffusion electrodes (GDE\s) suitable for use with a solid polymer electrolyte (s.p.e.), particularly in s.p.e. fuel cells, which GDE\s provide unusually highly efficient use of noble or precious electrocatalytic metals, are obtained by starting with a GDE which is essentially fully fabricated e
Gas-diffusion electrodes (GDE\s) suitable for use with a solid polymer electrolyte (s.p.e.), particularly in s.p.e. fuel cells, which GDE\s provide unusually highly efficient use of noble or precious electrocatalytic metals, are obtained by starting with a GDE which is essentially fully fabricated except for electrocatalytic metal treatment and s.p.e. treatment, e.g. a carbon GDE having a gas-permeable hydrophobic face and a particulate carbon-containing catalytic face. This untreated GDE is treated by a. impregnating an s.p.e. solutuion into the catalytic face until the solution penetrates part way into the cross-section of the GDE, especially into the carbon particulate or other support material, but not as far as the hydrophobic, gas permeable face, b. inserting the thus-treated GDE and a counterelectrode into a plating bath containing, for example, M+, M++, and/or M+++ions, where M is a metal of Group VIII or I-B of the Periodic Table, and c. applying an interrupted current (periodically interrupted or a single, long pulse 2 of catalytic metal, a performance comparable to cells with GDE loadings of about 0.5 mg/cm2 of the same metal.
대표청구항▼
A process for increasing the electrocatalytic activity of a gas-diffusion electrode having a gas-permeable face, and opposite thereto, a catalyzable face comprising a support material, said gas-diffusion electrode being substantially free of catalytic metal on the surface of said support material, s
A process for increasing the electrocatalytic activity of a gas-diffusion electrode having a gas-permeable face, and opposite thereto, a catalyzable face comprising a support material, said gas-diffusion electrode being substantially free of catalytic metal on the surface of said support material, said method comprising: a. impregnating into the catalyzable face of the gas-diffusion electrode a solution comprising an ion-exchange polymer, until said solution has wetted the catalyzable face of the gas-diffusion electrode and has penetrated part way into the cross-section of the untreated gas-diffusion electrode, thereby depositing ion-exchange polymer in contact with the support material, said gas-diffusion electrode, prior to this impregnating step, being substantially free of noble or precious catalytic metal on the surface of the support material and also substantially free of ion-exchange polymer, b. inserting the thus-treated gas-diffusion electrode resulting from said step a., along with a counterelectrode, into a plating bath containing ions, said ions including ions which contain a noble or precious catalytic metal in oxidized form, c. applying direct current to the said ion-exchange polymer-treated gas-diffusion electrode and the counterelectrode, and interrupting the direct current so that noble or precious catalytic metal particles not larger than about 10 nanometers in average particle size deposit on the support material of the catalyzable face of said treated gas diffusion electrode wherein a resulting loading of the catalytic metal particles is less than 4 mg per geometric square centimeter of catalyzable face, the depositing of these catalytic metal particles on the support material of the catalyzable face taking place essentially only on sites where support material is in contact with previously-deposited ion-exchange polymer.
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