US4402996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode coating with platinum-group metal catalyst and semi-conducting polymer
Assignee: ELECTRODE Corp A CORP OF
•
Filing: 1980-10-14
•
Granted: 1983-09-06
•
Expires: 2000-10-14
Abstract
Abstract PCT No. PCT/US80/01353 Sec. 371 Date May 21, 1981 Sec. 102(e) Date May 21, 1981 PCT Filed Oct. 14, 1980 PCT Pub. No. WO81/00973 PCT Pub. Date Apr. 16, 1981.A catalytic electrode has an electrically conductive substrate such as titanium with a coating comprising a platinum-group metal catalyst finely dispersed in a matrix consisting of a semi-conducting polymer formed in situ on the substrate. The catalyst may be a platinum-group metal oxide such as iridium oxide formed in situ together with the semi-conducting polymer by the application of a uniform liquid mixture followed by a controlled heat treatment. The semi-conducting polymer is preferably formed from polyacrylonitrile, polybenzimidazo-pyrrolone or an adamantane based polybenzoxazole.
Inventors
- 👤 Jurgen F. Gauger
- 👤 Jean M. Hinden
- 👤 Michael Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:01
CPC Classifications
C; C25; C25C; C25C7/00; C25C7/02; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/095; C25B11/075; C25B11/081; C25B11/02; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
140 words
A method of manufacturing an electrocatalytic coating comprising at least one platinum group metal catalyst and a polymer material applied to an electroconductive substrate characterized in that: (a) a uniform liquid mixture containing an inorganic salt compound of a platinum group metal which can be thermally converted to said catalyst, and further comprising at least one polymer which can be thermally converted to a semi-conducting insoluble polymer, is successively applied in several layers to the substrate, each layer being dried before the next layer is applied; and (b) subjecting the resulting dried layers to heat treatment so as to form the platinum group metal catalyst together with said semi-conducting insoluble polymer and to thereby produce a coating consisting of a uniform solid mixture wherein the platinum group metal catalyst is finely dispersed in a matrix of said semi-conducting insoluble polymer.
Claim 2
Independent Claim
140 words
A method of manufacturing an electrocatalytic coating comprising at least one platinum group metal catalyst and a polymer material applied to an electroconductive substrate characterized in that: (a) a uniform liquid mixture containing an inorganic salt compound of a platinum group metal which can be thermally converted to said catalyst, and further comprising at least one polymer which can be thermally converted to a semi-conducting insoluble polymer, is successively applied in several layers to the substrate, each layer being dried before the next layer is applied; and (b) subjecting the resulting dried layers to heat treatment so as to form the platinum group metal catalyst together with said semi-conducting insoluble polymer and to thereby produce a coating consisting of a uniform solid mixture wherein the platinum group metal catalyst is finely dispersed in a matrix of said semi-conducting insoluble polymer.
Claim 3
Independent Claim
132 words
A method of manufacturing an electrocatalytic coating comprising at least one platinum-group metal oxide and a polymer material applied to an electroconductive substrate characterized in that: (a) a uniform liquid mixture containing a platinum-group metal compound which can be thermally converted to said oxide, and further comprising at least one polymer which can be thermally converted to a semi-conducting insoluble polymer, is successively applied in several layers to the substrate, each layer being dried before the next layer is applied; and (b) subjecting the resulting dried layers to heat treatment so as to form the platinum-group metal oxide together with said semi-conducting insoluble polymer and to thereby produce a coating consisting of a uniform solid mixture wherein the platinum-group metal oxide is finely dispersed in a matrix of said semi-conducting insoluble polymer.
Claim 4
Independent Claim
132 words
A method of manufacturing an electrocatalytic coating comprising at least one platinum-group metal oxide and a polymer material applied to an electroconductive substrate characterized in that: (a) a uniform liquid mixture containing a platinum-group metal compound which can be thermally converted to said oxide, and further comprising at least one polymer which can be thermally converted to a semi-conducting insoluble polymer, is successively applied in several layers to the substrate, each layer being dried before the next layer is applied; and (b) subjecting the resulting dried layers to heat treatment so as to form the platinum-group metal oxide together with said semi-conducting insoluble polymer and to thereby produce a coating consisting of a uniform solid mixture wherein the platinum-group metal oxide is finely dispersed in a matrix of said semi-conducting insoluble polymer.
Claim 5
Dependent Claim
33 words
The method of claim 1 or 2, characterized in that said uniform liquid mixture applied to said substrate is a solution containing predetermined amounts of said platinum-group metal compound and of said polymer.
Claim 6
Dependent Claim
16 words
The method of claim 1 or 2, characterized in that said liquid mixture is an emulsion.
Claim 7
Dependent Claim
16 words
The method of claim 2, characterized in that said substrate consists of an electrochemical valve metal.
Claim 8
Dependent Claim
13 words
The method of claim 5, characterized in that said valve metal is titanium.
Claim 9
Dependent Claim
12 words
The method of claim 2, characterized in that said polymer is polyacrylonitrile.
Claim 10
Dependent Claim
12 words
The method of claim 2, characterized in that said polymer is polybenzimidazo-pyrrolone.
Claim 11
Dependent Claim
15 words
The method according to claim 2, characterized in that said polymer is an adamantane-based polybenzoxazole.
Claim 12
Independent Claim
30 words
The method of claims 2 or 5, characterized in that said heat treatment is carried out at a temperature in the range from about 300° C. to about 800° C.
Claim 13
Dependent Claim
30 words
The method of claim 10, characterized in that said heat treatment is carried out in air at a temperature in the range from about 300° C. to about 500° C.
Claim 14
Dependent Claim
25 words
The method of claim 11, characterized in that the duration of said heat treatment in said temperature range lies between 5 minutes and 120 minutes.
Claim 15
Dependent Claim
22 words
The method of claim 2, characterized in that said heat treatment is carried out in at least two stages at different temperatures.
Claim 16
Dependent Claim
61 words
The method of claim 13, characterized in that a first heat treatment is carried out in air in a temperature range from about 250° C. to about 300° C. after applying and drying each layer, and that a further heat treatment in a temperature range from about 300° C. to about 800° C. is carried out after applying the last layer.
Claim 17
Dependent Claim
29 words
The method of claim 14, characterized in that said further heat treatment is carried out in air in a temperature range from about 300° C. to about 500° C.
Claim 18
Dependent Claim
19 words
The method of claim 14, characterized in that said further heat treatment is carried out in a non-oxidative atmosphere.
Claim 19
Dependent Claim
22 words
The method of claim 16, characterized in that the duration of said further heat treatment is between 15 minutes and 6 hours.
Claim 20
Dependent Claim
16 words
The method of claim 1 characterized in that said substrate consists of an electrochemical valve metal.
Claim 21
Dependent Claim
13 words
The method of claim 18 characterized in that said valve metal is titanium.
Claim 22
Dependent Claim
12 words
The method of claim 1 characterized in that said polymer is polyacrylonitrile.
Claim 23
Dependent Claim
12 words
The method of claim 1 characterized in that said polymer is polybenzimidazo-pyrrolone.
Claim 24
Dependent Claim
15 words
The method according to claim 5 characterized in that said polymer is an adamantane-based polybenzoxazole.
Claim 25
Dependent Claim
31 words
The method of claim 1, 5 or 18, characterized in that said heat treatment is carried out at a temperature in the range from about 300° C. to about 800° C.
Claim 26
Dependent Claim
30 words
The method of claim 23 characterized in that said heat treatment is carried out in air at a temperature in the range from about 300° C. to about 500° C.
Claim 27
Dependent Claim
25 words
The method of claim 24, characterized in that the duration of said heat treatment in said temperature range lies between 5 minutes and 120 minutes.
Claim 28
Dependent Claim
22 words
The method of claim 1 characterized in that said heat treatment is carried out in at least two stages at different temperatures.
Claim 29
Dependent Claim
61 words
The method of claim 26 characterized in that a first heat treatment is carried out in air in a temperature range from about 250° C. to about 300° C. after applying and drying each layer, and that a further heat treatment in a temperature range from about 300° C. to about 800° C. is carried out after applying the last layer.
Claim 30
Dependent Claim
29 words
The method of claim 27 characterized in that said further heat treatment is carried out in air in a temperature range from about 300° C. to about 500° C.
Claim 31
Dependent Claim
20 words
The method of claim 27 characterized in that said further heat treatment is carried out in a non oxidative atmosphere.
Claim 32
Dependent Claim
22 words
The method of claim 29 characterized in that the duration of said further heat treatment is between 15 minutes and 6 hours.
References Cited (Backward Citations)
GB1024693A
Cited
US3438817A
Cited
GB1147442A
Cited
US3438815A
Cited
GB1112285A
Cited
GB1195871A
Cited
GB1231280A
Cited
GB1235570A
Cited
US3687724A
Cited
US3629007A
Cited
US3751301A
Cited
US3761679A
Cited
US3674675A
Cited
US3792732A
Cited
DE2220247A1
Cited
USRE29419E
Cited
US3881957A
Cited
GB1418943A
Cited
US4043933A
Cited
US4090979A
Cited
US4118294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |