EP0097508A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improved phosphoric acid fuel cell electrode
Assignee: BASF Catalysts LLC
•
Filing: 1983-06-20
•
Granted: —
•
Expires: 2003-06-20
Abstract
Abstract An improved electrode for use in a phosphoric acid containing fuel cell comprising a composition containing a precious metal and an oxide of germanium, chromium, tungsten, niobium, zirconium, hafnium, tantalum, or gallium in an amount sufficient to extend the period of efficient operation of said electrode.
Inventors
- 👤 Irvin R. Feins
- 👤 Joseph C. Dettling
- 👤 Chong-Zong Wan
- 👤 Robert J. Farrauto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 22:54
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/9016; H01M4/92; H01M4/925; H01M4/926; H01M4/96; H01M2004/8678; H01M2004/8689; H01M2300/00; H01M2300/0002; H01M2300/0005; H01M2300/0008; H01M4/8647; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
70 words
An electrode for use in a phosphoric acid containing fuel cell which is characterized by: (a) a support; (b) a phosphoric acid resistant conductive carrier; (c) a mixture of a catalytic amount of a Group VIII precious metal and an electrode-improving amount of at least one oxide of a metal selected from the group consisting of chromium, gallium, germanium, zirconium, niobium, hafnium, tantalum, and tungsten; and (d) a wet-proofing binder.
Claim 2
Dependent Claim
70 words
An electrode for use in a phosphoric acid containing fuel cell which is characterized by: (a) a support; (b) a phosphoric acid resistant conductive carrier; (c) a mixture of a catalytic amount of a Group VIII precious metal and an electrode-improving amount of at least one oxide of a metal selected from the group consisting of chromium, gallium, germanium, zirconium, niobium, hafnium, tantalum, and tungsten; and (d) a wet-proofing binder.
Claim 3
Dependent Claim
20 words
The electrode of Claim 1 wherein the oxide is selected from germanium oxide, tungsten oxide, gallium oxide and tantalum oxide.
Claim 4
Dependent Claim
25 words
The electrode of Claim 1 wherein the oxide is present in an amount up to about 30% by weight of the weight of the carrier.
Claim 5
Dependent Claim
13 words
The electrode of Claim 3 wherein the oxide content is upko about 15%.
Claim 6
Dependent Claim
29 words
The electrode of Claim 4 wherein the Group VIII precious metal is present in an amount of about 5 to 15% by weight of the weight of the carrier.
Claim 7
Dependent Claim
25 words
The electrode of Claim 1 wherein the carrier which contains the mixture is admixed with the wet-proofing binder prior to being deposited on the support.
Claim 8
Dependent Claim
68 words
The electrode of Claim 1 wherein the support is graphite paper; the Group VIII precious metal is platinum; the metal oxide is selected from gallium oxide, tantalum oxide, germanium oxide, and tungsten oxide; the oxide content is less than about 15% by weight of the carrier; the Group VIII precious metal content is about 5 to 15% by weight of the carrier; and the wet-proofing binder is tetrafluoroethylene.
Claim 9
Independent Claim
69 words
A method for minimizing metal migration and loss of active metal surface area of carbon/Group V I II precious metal electrodes for fuel cells operating in the presence of phosphoric acid which comprises depositing an oxide of a metal selected from the group consisting of chromium, gallium, germanium, zirconium, niobium, hafnium, tantalum, and tungsten, along with the Group VIII precious metal and maintaining the oxide in an oxidized state.
Claim 10
Independent Claim
69 words
A method for minimizing metal migration and loss of active metal surface area of carbon/Group V I II precious metal electrodes for fuel cells operating in the presence of phosphoric acid which comprises depositing an oxide of a metal selected from the group consisting of chromium, gallium, germanium, zirconium, niobium, hafnium, tantalum, and tungsten, along with the Group VIII precious metal and maintaining the oxide in an oxidized state.
Claim 11
Dependent Claim
20 words
The method of Claim 8 wherein the oxide is selected from gallium oxide, germanium oxide, tantalum oxide, and tungsten oxide.
Claim 12
Dependent Claim
16 words
The method of Claim 9 wherein the oxide is selected from tantalum oxide and tungsten oxide.
References Cited (Backward Citations)
US3393100A
Cited
US3506494A
Cited
FR2115394A1
Cited
US4017663A
Cited
FR2261059A1
Cited
US4031292A
Cited
FR2375905A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.