Patent US4181754A successfully refreshed from Google Patents.
US4181754A
Expired / Lapsed
US
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In situ method of preparing modified titanium dioxide photoactive electrodes
Assignee: Verizon Laboratories Inc
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Filing: 1978-06-22
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Granted: 1980-01-01
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Expires: 1998-06-22
Abstract
Abstract A method of preparing doped or modified polycrystalline p- or n-type titanium dioxide semiconductor electrodes utilizable in photoassisted oxidation reactions or photoelectrochemical cells is provided. The method comprises the steps of (1) applying to a titanium substrate a thin film of one or more oxide of metals selected from the group consisting of aluminum and the d-electron transition metals other than titanium, and (2) heating the coated titanium body in an oxygen-containing atmosphere at an elevated temperature, preferably below about 800° C., to sinter the coating to the titanium substrate. The sintering step produces on the titanium substrate a thin photoactive film of titanium dioxide containing a uniform concentration gradient of the previously-applied modifying oxide.
Inventors
- 👤 Howard McKinzie
- 👤 Elizabeth A. Trickett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:04
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/20; C; C25; C25B; C25B1/00; C25B1/50; C25B1/55; H01M; H01M14/00; H01M14/005; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/133
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
A method of preparing polycrystalline thin film photoactive semiconductor electrodes utilizable in photoassisted oxidation reactions comprising sequentially the steps of: providing a suspension of finely divided modifying oxide in a volatile solvent wherein the modifying oxide comprises at least one oxide of a metal selected from the group consisting of the d-electron transition metals excluding titanium, the metal exhibiting an oxidation state other than +4 in the oxide, applying the suspension of modifying oxide to the surface of a titanium metal body to form a thin film of the modifying oxide thereon, and heating the coated titanium metal body in an oxygen-containing atmosphere at an elevated temperature below about 800° C., for a period of time sufficient to form an adherent layer of titanium dioxide on the surface of the titanium body, whereby the titanium dioxide contains the modifying oxide in a uniform concentration gradient having a minimum at the titanium body surface and a maximum at the surface of said layer of titanium dioxide.
Claim 2
Independent Claim
165 words
A method of preparing polycrystalline thin film photoactive semiconductor electrodes utilizable in photoassisted oxidation reactions comprising sequentially the steps of: providing a suspension of finely divided modifying oxide in a volatile solvent wherein the modifying oxide comprises at least one oxide of a metal selected from the group consisting of the d-electron transition metals excluding titanium, the metal exhibiting an oxidation state other than +4 in the oxide, applying the suspension of modifying oxide to the surface of a titanium metal body to form a thin film of the modifying oxide thereon, and heating the coated titanium metal body in an oxygen-containing atmosphere at an elevated temperature below about 800° C., for a period of time sufficient to form an adherent layer of titanium dioxide on the surface of the titanium body, whereby the titanium dioxide contains the modifying oxide in a uniform concentration gradient having a minimum at the titanium body surface and a maximum at the surface of said layer of titanium dioxide.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein said modifying oxide is selected from the group consisting of cobalt oxide, lanthanum oxide, molybdenum oxide, silver oxide, tungstic oxide, vanadium pentoxide, and mixtures thereof.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein said electrode coating material is WO 3 .
Claim 5
Dependent Claim
38 words
The method of claim 2 wherein said coated titanium body is heated in an oxygen-containing atmosphere at a temperature of from about 500° C. to about 800° C. for a period of from one-quarter hour to eight hours.
Claim 6
Dependent Claim
11 words
The method of claim 4 wherein said oxygen-containing atmosphere is air.
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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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |