US3644147A
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Mixed valency transition metal perovskites as cathodic reduction catalysts
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1969-04-24
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Granted: 1972-02-22
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Expires: 1989-04-24
Abstract
Abstract Ionic crystals having a perovskite structure and comprising a solid solution of oxides of the formulas ABO3 and A''BO3 where A and A'' are nontransition metals and B is a transition metal present in two different valency states are effective cathodic electrocatalysts for use in electrochemical cells such as fuel cells.
Inventors
- 👤 Archie R Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:40
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/9016; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
22 words
An electrochemical cell according to claim 1 iN which A is a lanthanide series metal and A'' is an alkaline earth metal.
Claim 2
Dependent Claim
16 words
A cell according to claim 2 in which said alkaline earth metal is strontium or barium.
Claim 3
Dependent Claim
22 words
A cell according to claim 1 in which B is a first row transition metal with stable +3 and +4 oxidation states.
Claim 4
Dependent Claim
18 words
A cell according to claim 4 in which B is titanium, vanadium, chromium, manganese, iron, cobalt or nickel.
Claim 5
Dependent Claim
201 words
In a fuel cell comprising an inert anode, an inert cathode, aqueous alkaline electrolyte, means for supplying a fluid fuel to said anode and means for supplying a fluid oxidant to said cathode, the improvement wherein said cathode comprises an electrically conductive base support and a catalyst comprising a mixed valency nonnoble metal perovskite having the general formula AxA''yBO3 wherein A is a metal selected from Groups IA, IIA and IIIB of the Periodic Table, A'' is a metal having a valence different from that of A and selected from Groups IA, IIA and IIIB of the Periodic Table and B is a nonnoble transition metal selected from Groups IVB, VB, VIB, VIIB and VIII of the Periodic Table, and the sum of x and y is 1, said perovskite being a solid solution of a first oxide having the formula ABO3 and a second oxide having the formula A''BO3, said metal B having one valency state in said first oxide and a second valency state in said second oxide, the sum of the valences of A and B in said first oxide being 6 and the sum of the valences of A'' and B in said second oxide being 6.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |