Patent US4316944A successfully refreshed from Google Patents.
US4316944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noble metal-chromium alloy catalysts and electrochemical cell
Assignee: RTX Corp
•
Filing: 1980-06-18
•
Granted: 1982-02-23
•
Expires: 2000-06-18
Abstract
Abstract A novel and improved noble metal-chromium alloy catalyst is disclosed with catalytic oxygen reduction activity at least twice that of the unalloyed noble metal. The noble metal-chromium alloy catalyst disclosed has particular utility as an electrocatalyst for the reduction of oxygen which makes it particularly useful as a cathode catalyst in an acid fuel cell.
Inventors
- 👤 Douglas A. Landsman
- 👤 Francis J. Luczak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:47
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/92; H01M4/928; B; B01; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8933; B01J23/8993; C; C22; C22C; C22C5/00; C22C5/04; H01M4/925; H01M4/926; H01M2004/8678; H01M2004/8689; H01M2300/00; H01M2300/0002; H01M2300/0005; H01M2300/0008; H01M4/921; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
60 words
An electrochemical cell comprising a cathode electrode including a noble metal-base metal alloy oxygen reducing catalyst, said catalyst comprising a platinum-chromium alloy with a catalytic activity for the reduction of oxygen at least twice that of the platinum in unalloyed form wherein the surface area of the alloy is at least 30 m 2 /g of platinum in the alloy.
Claim 2
Dependent Claim
60 words
An electrochemical cell comprising a cathode electrode including a noble metal-base metal alloy oxygen reducing catalyst, said catalyst comprising a platinum-chromium alloy with a catalytic activity for the reduction of oxygen at least twice that of the platinum in unalloyed form wherein the surface area of the alloy is at least 30 m 2 /g of platinum in the alloy.
Claim 3
Dependent Claim
15 words
The cell according to claim 1 wherein the alloy is disposed on conductive support particles.
Claim 4
Dependent Claim
12 words
The cell according to claim 2 wherein the support particles are carbon.
Claim 5
Dependent Claim
76 words
An acid fuel cell including phosphoric acid electrolyte and a cathode electrode, said electrode comprising an electrically conductive substrate and a layer of catalyst disposed on said substrate, said catalyst comprising a platinum-chromium alloy supported on carbon particles, said alloy having a catalytic activity for the reduction of oxygen at least twice that of the supported platinum in unalloyed form, and a surface area of at least 30 m 2 /g of platinum in the alloy.
Claim 6
Dependent Claim
76 words
An acid fuel cell including phosphoric acid electrolyte and a cathode electrode, said electrode comprising an electrically conductive substrate and a layer of catalyst disposed on said substrate, said catalyst comprising a platinum-chromium alloy supported on carbon particles, said alloy having a catalytic activity for the reduction of oxygen at least twice that of the supported platinum in unalloyed form, and a surface area of at least 30 m 2 /g of platinum in the alloy.
Claim 7
Dependent Claim
78 words
A fuel cell comprising an anode electrode spaced apart from a cathode electrode and having an electrolyte disposed therebetween, said cathode electrode comprising a finely divided catalyst uniformly dispersed on conductive carbon support particles, said catalyst consisting of a platinum-chromium alloy having a catalytic activity for the reduction of oxygen at least twice the catalytic activity of supported platinum in unalloyed form, and a surface area of at least 30 m 2 /g of platinum in the alloy.
Claim 8
Dependent Claim
78 words
A fuel cell comprising an anode electrode spaced apart from a cathode electrode and having an electrolyte disposed therebetween, said cathode electrode comprising a finely divided catalyst uniformly dispersed on conductive carbon support particles, said catalyst consisting of a platinum-chromium alloy having a catalytic activity for the reduction of oxygen at least twice the catalytic activity of supported platinum in unalloyed form, and a surface area of at least 30 m 2 /g of platinum in the alloy.
Claim 9
Dependent Claim
57 words
A noble metal-base metal alloy catalyst for use in the catalytic reduction of oxygen consisting of a platinum-chromium alloy catalyst containing up to about 30 atomic percent chromium, the surface area of platinum in the alloy being at least 30 m 2 /g and having catalytic oxygen reduction activity at least twice that of the unalloyed platinum.
Claim 10
Dependent Claim
57 words
A noble metal-base metal alloy catalyst for use in the catalytic reduction of oxygen consisting of a platinum-chromium alloy catalyst containing up to about 30 atomic percent chromium, the surface area of platinum in the alloy being at least 30 m 2 /g and having catalytic oxygen reduction activity at least twice that of the unalloyed platinum.
Claim 11
Dependent Claim
13 words
The catalyst of claim 5, wherein the catalyst is supported on carbon particles.
Claim 12
Dependent Claim
11 words
The catalyst of claim 6 comprising about 25 atomic percent chromium.
References Cited (Backward Citations)
US3428490A
Cited
US3346421A
Cited
GB1074862A
Cited
US3615836A
Cited
US3506494A
Cited
US4126934A
Cited
US4192907A
Cited
US4202934A
Cited
US4185145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |