US4206270A
Expired / Lapsed
US
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Cathodes for molten carbonate fuel cells
Assignee: RTX Corp
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Filing: 1978-12-14
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Granted: 1980-06-03
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Expires: 1998-12-14
Abstract
Abstract Porous cathodes for molten carbonate type fuel cells are made from perovskites. The perovskites tested to date all appear to be good cathode catalysts for the reduction of oxygen in molten carbonate electrolyte and are also stable in the electrolyte.
Inventors
- 👤 H. Russell Kunz
- 👤 Lawrence J. Bregoli
- 👤 Francis J. Luczak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:50
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/8605; H01M4/8621; H01M4/90; H01M4/9016; H01M2004/8678; H01M2004/8689; H01M8/00; H01M8/14; H01M2008/147; H01M2300/00; H01M2300/0017; H01M2300/0048; H01M2300/0051; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A fuel cell including an alkali metal carbonate electrolyte which is molten during operation of the fuel cell, an anode electrode in contact with said electrolyte, and a porous perovskite cathode electrode spaced from said anode electrode and also in contact with said electrolyte, the perovskite having an electrical resistivity of less than 10.0Ω-cm.
Claim 2
Dependent Claim
54 words
A fuel cell including an alkali metal carbonate electrolyte which is molten during operation of the fuel cell, an anode electrode in contact with said electrolyte, and a porous perovskite cathode electrode spaced from said anode electrode and also in contact with said electrolyte, the perovskite having an electrical resistivity of less than 10.0Ω-cm.
Claim 3
Dependent Claim
48 words
The fuel cell according to claim 1 wherein said perovskite is selected from the group consisting of La x K y MnO 3 , La x Zr y CoO 3 , La x Sr y MnO 3 , and La x Sr y CoO 3 , where x+y=1.0.
Claim 4
Dependent Claim
60 words
The fuel cell according to claim 1 wherein said perovskite is selected from the group consisting of La 0 .9 K 0 .1 MnO 3 , La 0 .95 Zr 0 .05 CoO 3 , LaMnO 3 , La 0 .9 Sr 0 .1 MnO 3 , La 0 .9 Sr 0 .1 CoO 3 , and LaCoO 3 .
Claim 5
Dependent Claim
27 words
The fuel cell according to claim 1 wherein the perovskite material of which said cathode electrode is made has an electrical resistivity of no more than 1.0Ω-cm.
Claim 6
Dependent Claim
20 words
The fuel cell according to claim 1 wherein said electrolyte is a binary eutectic of lithium carbonate and potassium carbonate.
Claim 7
Dependent Claim
107 words
A fuel cell including a binary eutectic electrolyte of lithium carbonate and potassium carbonate which is molten during operation of the fuel cell, an anode electrode in contact with said electrolyte, and a porous perovskite cathode electrode spaced from said anode electrode and also in contact with said electrolyte, said perovskite being selected from the group consisting of LaMnO 3 , LaCoO 3 , La x K y MnO 3 , La x Zr y CoO 3 , La x Sr y MnO 3 , and La x Sr y CoO 3 , where x+y=1.0 and said perovskite has an electrical resistivity of no more than 1.0Ω-cm.
Claim 8
Dependent Claim
107 words
A fuel cell including a binary eutectic electrolyte of lithium carbonate and potassium carbonate which is molten during operation of the fuel cell, an anode electrode in contact with said electrolyte, and a porous perovskite cathode electrode spaced from said anode electrode and also in contact with said electrolyte, said perovskite being selected from the group consisting of LaMnO 3 , LaCoO 3 , La x K y MnO 3 , La x Zr y CoO 3 , La x Sr y MnO 3 , and La x Sr y CoO 3 , where x+y=1.0 and said perovskite has an electrical resistivity of no more than 1.0Ω-cm.
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) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |