US4414092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sandwich-type electrode
Assignee: United States Department of Energy
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Filing: 1982-04-15
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Granted: 1983-11-08
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Expires: 2002-04-15
Abstract
Abstract Disclosed is an improvement on a method of making an electrode wherein a suspension in a liquid is prepared of a powdered catalyst containing a noble metal, carbon powder and a binder, and the suspension is poured over a carbon substrate dried, compressed and sintered to form a solid catalyst layer bonded to the carbon substrate. The improvement is placing a carbon paper on the catalyst layer prior to compressing. The improved electrode can be used as either a cathode or an anode in a sulfur dioxide depolarized electrolyzer in a process for producing hydrogen from water.
Inventors
- 👤 Wen-Tong P. Lu
- 👤 Earl R. Garcia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:13
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; C; C25; C25B; C25B11/00; C25B11/04; C25B11/042; C25B11/043; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
In a method of making an electrode wherein a suspension in a liquid is prepared of a powdered catalyst containing a noble metal, carbon powder, and a binder, the suspension is poured over a carbon substrate, dryed, compressed, and sintered to form a solid catalyst layer bonded to said carbon substrate, the improvement comprising placing carbon paper on the surface of said solid catalyst layer prior to said compressing.
Claim 2
Dependent Claim
69 words
In a method of making an electrode wherein a suspension in a liquid is prepared of a powdered catalyst containing a noble metal, carbon powder, and a binder, the suspension is poured over a carbon substrate, dryed, compressed, and sintered to form a solid catalyst layer bonded to said carbon substrate, the improvement comprising placing carbon paper on the surface of said solid catalyst layer prior to said compressing.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein said carbon paper is about 0.05 to about 0.2 cm thick.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein said carbon substrate is carbon paper about 0.03 to about 0.1 cm thick.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein said noble metal is platinum or palladium, and said binder is polytetrafluoroethylene.
Claim 6
Dependent Claim
43 words
A method according to claim 1 wherein about 30 to about 45% by weight of the solids in said suspension is said binder and about 5 to about 10% by weight of said noble metal and said carbon powder is said noble metal.
Claim 7
Dependent Claim
38 words
A method according to claim 1 wherein the loading of said noble metal on said substrate is about 0.5 to about 2 mg/cm 2 for an anode and about 0.25 to about 1 mg/cm 2 for a cathode.
Claim 8
Dependent Claim
32 words
A method according to claim 1 wherein a vacuum of about 25 to about 50 mm-Hg is applied to the opposite side of said substrate when said suspension is poured over it.
Claim 9
Dependent Claim
28 words
A method according to claim 1 wherein said substrate is compressed at about 15 to about 30 MPa and is sintered at about 300° to about 360° C.
Claim 10
Dependent Claim
27 words
A method according to claim 1 including the additional last step of placing said electrodes in an electrolyte between current collectors and separators to form a cell.
Claim 11
Dependent Claim
10 words
An electrode made according to the method of claim 1.
Claim 12
Dependent Claim
12 words
A method according to claim 1 wherein said liquid is distilled water.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |