EP0149293A1
Expired / Lapsed
EP
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Improved electrocatalyst and fuel cell electrode using the same
Assignee: BASF Catalysts LLC
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Filing: 1984-01-18
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Granted: —
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Expires: 2004-01-18
Abstract
Abstract An improved electrocatalyst comprises a supported platinum-gallium alloy catalyst of up to 50 atomic percent gallium, preferably of 10 to 30 atomic percent gallium, balance platinum. The platinum-gallium alloy is supported, preferably on carbon powder or the like, shows greater activity for oxygen reduction and better resistance to sintering than does a comparable platinum catalyst. A fuel cell electrode especially suited for use as a phosphoric acid fuel cell cathode comprises the supported platinum-gallium alloy electrocatalyst bound to an acid resistant support member.
Inventors
- 👤 Chung Zong Wan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 16:31
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/92; H01M4/925; B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/62; C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; H01M4/926; H01M2004/8678; H01M2004/8689; H01M2300/00; H01M2300/0002; H01M2300/0005; H01M2300/0008; H01M4/921; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
23 words
A platinum group metal alloy electrocatalyst comprises a platinum-gallium alloy of up to about fifty atomic percent gallium dispersed on a suitable carrier.
Claim 2
Dependent Claim
23 words
A platinum group metal alloy electrocatalyst comprises a platinum-gallium alloy of up to about fifty atomic percent gallium dispersed on a suitable carrier.
Claim 3
Dependent Claim
10 words
The electrocatalyst of claim 1 wherein said carrier comprises carbon.
Claim 4
Dependent Claim
20 words
The electrocatalyst of claim 1 wherein the platinum-gallium alloy has a surface area of at least 30 m 2 /g.
Claim 5
Dependent Claim
33 words
The electrocatalyst of claim 1 wherein the platinum-gallium alloy comprises about 10 to 30 atomic percent gallium and the platinum-gallium alloy has a surface area of at least about 30 m 2 /g.
Claim 6
Dependent Claim
27 words
The electrocatal y st of claim 1 wherein the platinum-gallium alloy comprises about 0.1 to 30% by weight of the total weight of the alloy plus carrier;,
Claim 7
Dependent Claim
44 words
An electrode for an acid electrolyte fuel cell comprises a catalytically effective amount of a platinum group metal alloy catalyst supported on an acid-resistant support member, the catalyst comprising a platinum-gallium alloy as in any one of Claims 1, 2, 3, 4 or 5.
Claim 8
Dependent Claim
12 words
The electrode of claim 6 wherein the carrier is a conductive carbon.
Claim 9
Dependent Claim
30 words
The electrode of claim 6 wherein the platinum-gallium alloy is present in an amount of about 0.1 to 2 mg of Pt-Ga alloy per square centimeter of support area surface.
Claim 10
Dependent Claim
69 words
A cathode for an acid electrolyte fuel cell comprises a catalytically effective amount of a platinum group metal alloy catalyst supported on an acid-resistant support member, the catalyst comprising a platinum-gallium alloy of about 5 to 50 atomic percent gallium dispersed on a suitable carrier, the platinum-gallium alloy being present in an amount of about 0.1 to 2 mg of Pt-Ga alloy per square centimeter of support member surface.
Claim 11
Dependent Claim
69 words
A cathode for an acid electrolyte fuel cell comprises a catalytically effective amount of a platinum group metal alloy catalyst supported on an acid-resistant support member, the catalyst comprising a platinum-gallium alloy of about 5 to 50 atomic percent gallium dispersed on a suitable carrier, the platinum-gallium alloy being present in an amount of about 0.1 to 2 mg of Pt-Ga alloy per square centimeter of support member surface.
Claim 12
Dependent Claim
50 words
The cathode of claim 9 wherein the platinum-gallium alloy comprises about 10 to 30 atomic percent gallium, balance platinum, the alloy has a surface area of at least 30 m 2 /g, and comprises from about 0.1 to 30% by weight of the total weight of the alloy plus carrier.
Claim 13
Dependent Claim
29 words
The cathode of claim 10 wherein the carrier of the platinum-gallium alloy catalyst comprises carbon particles, and further including an acid-resistant binder binding the catalyst to the support member.
References Cited (Backward Citations)
FR2103122A5
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US3789024A
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DE2515480A1
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FR2304185A1
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GB2024501A
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GB2117791A
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EP0097508A1
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