US3961987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-catalyst and process of manufacture
Assignee: Siemens AG
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Filing: 1974-05-23
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Granted: 1976-06-08
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Expires: 1994-05-23
Abstract
Abstract The invention relates to an electrocatalyst capable of being used, in particular, in anodes of fuel cells with acid electrolyte, and to a process for the manufacture of this electrocatalyst. The electrocatalyst contains at least one ternary metal compound which is composed of one metal of the iron group of the periodic table of elements, i.e. iron, cobalt or nickel, and two different elements of the phosphorus, arsenic, antimony, bismuth, sulfur, selenium and tellurium group, and has semiconducting characteristics. Examples of such ternary metal compounds serving as electrocatalysts are FePS, CoPS and CoAsS. The new electrocatalysts show a high catalytic effect and are insensitive to catalyst poisons.
Inventors
- 👤 Konrad Mund
- 👤 Rolf Schulte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:36
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J27/02; B01J27/04; H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
43 words
An electrocatalyst comprising at least one compound with semiconductor characteristics consisting of a metal of the iron group of the periodic table of elements and two different elements selected from the group consisting of phosphorous, arsenic, antimony, bismuth, tellurium and sulfur or selenium.
Claim 2
Dependent Claim
43 words
An electrocatalyst comprising at least one compound with semiconductor characteristics consisting of a metal of the iron group of the periodic table of elements and two different elements selected from the group consisting of phosphorous, arsenic, antimony, bismuth, tellurium and sulfur or selenium.
Claim 3
Dependent Claim
10 words
Electrocatalyst according to claim 1 wherein the compound is FePS.
Claim 4
Dependent Claim
10 words
Electrocatalyst according to claim 1 wherein the compound is CoPS.
Claim 5
Dependent Claim
10 words
Electrocatalyst according to claim 1 wherein the compond is CoAsS.
Claim 6
Dependent Claim
25 words
Electrocatalyst according to claim 1 wherein the catalyst material is present as a powder having an average grain diameter of between 1 and 50 microns.
Claim 7
Dependent Claim
64 words
An electrode adapted for use in a fuel cell having an acid electrolyte, said electrode comprising an electrocatalyst having a formula MXY with semi-conducting characteristics, wherein M is a metal selected from the iron group of the periodic table of elements and X and Y are two different elements selected from the group consisting of phosphorous, arsenic, antimony, bismuth, tellurium and sulfur or selenium.
Claim 8
Dependent Claim
64 words
An electrode adapted for use in a fuel cell having an acid electrolyte, said electrode comprising an electrocatalyst having a formula MXY with semi-conducting characteristics, wherein M is a metal selected from the iron group of the periodic table of elements and X and Y are two different elements selected from the group consisting of phosphorous, arsenic, antimony, bismuth, tellurium and sulfur or selenium.
Claim 9
Dependent Claim
27 words
The electrode according to claim 6 wherein the electrocatalyst is in the form of powder particles which are cohesively bound together by an acid resistant plastic matrix.
Claim 10
Dependent Claim
15 words
The electrode according to claim 7 wherein the plastic binder is a copolymer of butadiene-styrene-acrylonitrile.
Claim 11
Dependent Claim
18 words
The electrode according to claim 6 wherein the electrocatalyst in powder form also contains a surface area dispersant.
Claim 12
Dependent Claim
14 words
The electrode according to claim 9 wherein the surface area dispersant is activated carbon.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |