US4447506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ternary fuel cell catalysts containing platinum, cobalt and chromium
Assignee: RTX Corp
•
Filing: 1983-01-17
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Granted: 1984-05-08
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Expires: 2003-01-17
Abstract
Abstract An improved ternary noble metal-containing, alloy catalyst which has a catalytic activity for the electrochemical reduction of oxygen greater than two and one-half times that of the supported unalloyed noble metal alone. In addition, a disclosure of the method of preparing said catalyst is by intimately contacting two metallic elements with a supported noble metal, then heating this material to form the ternary alloy catalyst. This catalyst has particular utility for the electrochemical reduction of oxygen which makes it particularly useful as a cathode in acid fuel cells. The preferred embodiment of this catalyst is finely divided platinum alloyed with chromium and cobalt supported on an electrically conductive carbon-black support material.
Inventors
- 👤 Francis J. Luczak
- 👤 Douglas A. Landsman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:26
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/92; H01M4/925; H01M4/926; H01M2004/8678; H01M2004/8689; H01M2300/00; H01M2300/0002; H01M2300/0005; H01M2300/0008; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
A fuel cell having an anode and a cathode with an electrolyte disposed therebetween, wherein the improvement comprises a ternary alloy cathode catalyst of platinum, cobalt, and chromium supported on an electrically conductive carbon-black, said catalyst having a catalytic activity for the electrochemical reduction of oxygen at least two and one-half times that of an unalloyed platinum catalyst supported on the same electrically conductive carbon-black.
Claim 2
Dependent Claim
65 words
A fuel cell having an anode and a cathode with an electrolyte disposed therebetween, wherein the improvement comprises a ternary alloy cathode catalyst of platinum, cobalt, and chromium supported on an electrically conductive carbon-black, said catalyst having a catalytic activity for the electrochemical reduction of oxygen at least two and one-half times that of an unalloyed platinum catalyst supported on the same electrically conductive carbon-black.
Claim 3
Dependent Claim
12 words
The fuel cell of claim 1 wherein the electrolyte is phosphoric acid.
Claim 4
Dependent Claim
46 words
A ternary metal alloy catalyst comprising platinum, chromium and cobalt dispersed on an electrically conductive carbon-black, wherein the catalyst has a catalytic activity for the electrochemical reduction of oxygen of at least two and one-half times that of unalloyed platinum on the same electrically conductive carbon-black.
Claim 5
Dependent Claim
46 words
A ternary metal alloy catalyst comprising platinum, chromium and cobalt dispersed on an electrically conductive carbon-black, wherein the catalyst has a catalytic activity for the electrochemical reduction of oxygen of at least two and one-half times that of unalloyed platinum on the same electrically conductive carbon-black.
Claim 6
Dependent Claim
23 words
The catalyst of claim 3 wherein the chromium is 6-12% by weight, the cobalt is 8-14% by weight and the balance is platinum.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |