US5106706A
Expired / Lapsed
US
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Oxide modified air electrode surface for high temperature electrochemical cells
Assignee: Siemens Energy Inc
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Filing: 1990-10-18
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Granted: 1992-04-21
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Expires: 2010-10-18
Abstract
Abstract An electrochemical cell is made having a porous cermet electrode (16) and a porous lanthanum manganite electrode (14), with solid oxide electrolyte (15) between them, where the lanthanum manganite surface next to the electrolyte contains a thin discontinuous layer of high surface area cerium oxide and/or praseodymium oxide, preferably as discrete particles (30) in contact with the air electrode and electrolyte.
Inventors
- 👤 Prabhakar Singh
- 👤 Roswell J. Ruka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:07
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/10; H01M8/12; G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4075; H01M4/00; H01M4/86; H01M4/90; H01M4/9016; H01M4/9025; H01M4/9033; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
An electrochemical cell comprising a porous cermet electrode and a porous lanthanum manganite electrode, with stabilized zirconia solid oxide electrolyte therebetween, where the lanthanum manganite electrode surface next to the electrolyte contains a porous, discontinuous layer of a material selected from the group consisting of cerium oxide, praseodymium oxide and mixtures thereof, and where the electrolyte contacts both the lanthanum manganite and the discontinuous oxide layer.
Claim 2
Dependent Claim
66 words
An electrochemical cell comprising a porous cermet electrode and a porous lanthanum manganite electrode, with stabilized zirconia solid oxide electrolyte therebetween, where the lanthanum manganite electrode surface next to the electrolyte contains a porous, discontinuous layer of a material selected from the group consisting of cerium oxide, praseodymium oxide and mixtures thereof, and where the electrolyte contacts both the lanthanum manganite and the discontinuous oxide layer.
Claim 3
Dependent Claim
38 words
The cell of claim 1, where the cermet electrode is nickel-zirconia, the electrolyte is a zirconia based ceramic, and the lanthanum manganite is in the form of sintered particles having particle diameters from 1 micrometer to 15 micrometers.
Claim 4
Dependent Claim
10 words
The cell of claim 1, in tubular fuel cell configuration.
Claim 5
Dependent Claim
58 words
The cell of claim 1, where the air electrode is from 500 micrometers to 2,000 micrometers thick, the discontinuous layer is in the form of discrete particles having diameters from 0.01 micrometer to 0.1 micrometer, and where 90% to 100% of the particles are in the top 50 micrometers of the air electrode structure next to the electrolyte.
Claim 6
Dependent Claim
32 words
The cell of claim 1, where the discontinuous layer is in the form of discrete particles having a surface area of from approximately 35 m 2 /gram to 150 m 2 /gram.
Claim 7
Dependent Claim
25 words
The cell of claim 1, where the discontinuous layer consists of cerium oxide particles, said particles being effective to provide nucleating sites for electrolyte formation.
Claim 8
Dependent Claim
11 words
A plurality of the cells of claim 1, electrically connected together.
Claim 9
Dependent Claim
72 words
A tubular fuel cell comprising a porous cermet fuel electrode, and a porous lanthanum manganite air electrode in the form of sintered particles, with solid ceramic oxide electrolyte therebetween, where the air electrode surface next to the electrolyte contains a porous, discontinuous layer of small, discrete cerium oxide particles having diameters from 0.01 micrometer to 0.1 micrometer, and where the electrolyte contacts both the lanthanum manganite and the discontinuous cerium oxide layer.
Claim 10
Dependent Claim
72 words
A tubular fuel cell comprising a porous cermet fuel electrode, and a porous lanthanum manganite air electrode in the form of sintered particles, with solid ceramic oxide electrolyte therebetween, where the air electrode surface next to the electrolyte contains a porous, discontinuous layer of small, discrete cerium oxide particles having diameters from 0.01 micrometer to 0.1 micrometer, and where the electrolyte contacts both the lanthanum manganite and the discontinuous cerium oxide layer.
Claim 11
Dependent Claim
60 words
The fuel cell of claim 8, where the electrolyte is stabilized zirconia, the air electrode is from 500 micrometers to 2,000 micrometers thick, 90% to 100% of the cerium oxide particles are in the top 50 micrometers of the air electrode structure next to the electrolyte, and said cerium oxide particles are effective to provide nucleating sites for electrolyte formation.
Claim 12
Dependent Claim
11 words
A plurality of the cells of claim 8, electrically connected together.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1995-04-21 | 1995-10-21 | 1996-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-21 | 1999-10-21 | 2000-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-21 | 2003-10-21 | 2004-04-21 | $7700.00 | Window Closed / Lapsed |