Patent US4232097A successfully refreshed from Google Patents.
US4232097A
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Fuel cell oxygen electrode
Assignee: United States Department of Energy
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Filing: 1979-03-07
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Granted: 1980-11-04
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Expires: 1999-03-07
Abstract
Abstract An oxygen electrode for a fuel cell utilizing an acid electrolyte has a substrate of an alkali metal tungsten bronze of the formula: A x WO 3 where A is an alkali metal and x is at least 0.2, which is covered with a thin layer of platinum tungsten bronze of the formula: Pt y WO 3 where y is at least 0.8.
Inventors
- 👤 Howard R. Shanks
- 👤 Albert J. Bevolo
- 👤 Gordon C. Danielson
- 👤 Michael F. Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:29
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/9016; H01M8/00; H01M8/08; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A cathode for use in a hydrogen-oxygen fuel cell comprising: a substrate of electrically conductive tungsten bronze crystal of the formula A x WO 3 where A is an alkali metal selected from the group consisting of sodium, potassium, lithium, rubidium and cesium and x is at least 0.2 and a catalytic layer on the substrate wherein the alkali metal ions of the substrate have been replaced by platinum ions to form a platinum tungsten bronze of the formula Pt y WO 3 where y is at least 0.5.
Claim 2
Dependent Claim
89 words
A cathode for use in a hydrogen-oxygen fuel cell comprising: a substrate of electrically conductive tungsten bronze crystal of the formula A x WO 3 where A is an alkali metal selected from the group consisting of sodium, potassium, lithium, rubidium and cesium and x is at least 0.2 and a catalytic layer on the substrate wherein the alkali metal ions of the substrate have been replaced by platinum ions to form a platinum tungsten bronze of the formula Pt y WO 3 where y is at least 0.5.
Claim 3
Dependent Claim
11 words
The electrode of claim 1 wherein the alkali metal is sodium.
Claim 4
Dependent Claim
9 words
The electrode of claim 2 wherein y is 0.8.
Claim 5
Dependent Claim
15 words
The electrode of claim 3 wherein the substrate and catalytic layer are a single crystal.
Claim 6
Dependent Claim
116 words
In combination with a hydrogen-oxygen fuel cell which includes an anode, a cathode and an acid electrolyte positioned therebetween and communicating with the anode and cathode, the improvement which comprises the cathode, wherein the cathode consists of a substrate of electrically conductive tungsten bronze crystal of the formula A x WO 3 where A is an alkali metal selected from the group consisting of sodium, potassium, lithium, rubidium and cesium and x is at least 0.2, and a catalytic layer on the substrate wherein the alkali metal ions of the substrate have been replaced by platinum ions to form a platinum tungsten bronze having the formula Pt y WO 3 where y is at least 0.5.
Claim 7
Dependent Claim
116 words
In combination with a hydrogen-oxygen fuel cell which includes an anode, a cathode and an acid electrolyte positioned therebetween and communicating with the anode and cathode, the improvement which comprises the cathode, wherein the cathode consists of a substrate of electrically conductive tungsten bronze crystal of the formula A x WO 3 where A is an alkali metal selected from the group consisting of sodium, potassium, lithium, rubidium and cesium and x is at least 0.2, and a catalytic layer on the substrate wherein the alkali metal ions of the substrate have been replaced by platinum ions to form a platinum tungsten bronze having the formula Pt y WO 3 where y is at least 0.5.
Claim 8
Dependent Claim
15 words
The combination with a fuel cell of claim 1 wherein the alkali metal is sodium.
Claim 9
Dependent Claim
13 words
The combination with a fuel cell of claim 6 wherein y is 0.8.
Claim 10
Dependent Claim
16 words
The combination with a fuel cell of claim 7 wherein the electrode is a single crystal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |