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Patent US4345982A successfully refreshed from Google Patents.
US4345982A
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Process for the production of hydrogen utilizing a photogalvanic effect of a polyacid ion
Assignee: Tokyo Institute of Technology
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Filing: 1981-02-25
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Granted: 1982-08-24
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Expires: 2001-02-25
Abstract
Abstract A process for the production of hydrogen is disclosed. This process utilizes a photogalvanic effect of a polyacid ion and comprises immersing an anode into an aqueous solution of an alkylammonium salt of polytungstic acid or polyvanadic acid as an anode electrolyte, immersing a cathode into an aqueous solution of an acid as a cathode electrolyte, isolating both said aqueous solutions to each other, electrically connecting both said electrodes to each other, and irradiating a light onto said anode electrolyte, whereby hydrogen is evoluted at said cathode.
Inventors
- 👤 Tsuneo Ikawa
- 👤 Toshihiro Yamase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:43
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/50; C25B1/55; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A process for the production of hydrogen comprising immersing an anode into an aqueous solution of an alkylammonium salt of polytungstic acid or polyvanadic acid as an anode electrolyte, immersing a cathode into an aqueous solution of an acid as a cathode electrolyte, isolating both said electrolytes from each other, electrically connecting both the electrodes to each other and irradiating a light onto said anode electrolyte, whereby hydrogen is evolved at said cathode.
Claim 2
Dependent Claim
73 words
A process for the production of hydrogen comprising immersing an anode into an aqueous solution of an alkylammonium salt of polytungstic acid or polyvanadic acid as an anode electrolyte, immersing a cathode into an aqueous solution of an acid as a cathode electrolyte, isolating both said electrolytes from each other, electrically connecting both the electrodes to each other and irradiating a light onto said anode electrolyte, whereby hydrogen is evolved at said cathode.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1, wherein said polytungstic acid has an ion concentration of 10 -3 -10 -2 mole.
Claim 4
Dependent Claim
21 words
A process as claimed in claim 1, wherein said polyvanadic acid has an ion concentration of 10 -3 -4×10 -2 mole.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 1, wherein said alkylammonium is selected from methylammonium, ethylammonium, isopropylammonium and n-propylammonium.
Claim 6
Dependent Claim
16 words
A process as claimed in claim 1, wherein said anode electrolyte has a pH of 7-10.
Claim 7
Dependent Claim
13 words
A process as claimed in claim 1, wherein said acid is sulfuric acid.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 1, wherein said cathode electrolyte has a pH of not more than 1.
Claim 9
Dependent Claim
36 words
A process as claimed in claim 1, wherein each of said anode and cathode is made of a material selected from Pt, W, Pd, C, TiO 2 , SnO 2 and In 2 O 3 .
Claim 10
Dependent Claim
28 words
A process as defined in claim 1, wherein said aqueous solution of an alkylammonium salt of polytungstic acid or polyvanadic acid is formed by an alkylammonium perchlorate solution.
Claim 11
Dependent Claim
23 words
A process as defined in claim 1, wherein the light is irradiated onto the anode electrolyte by directing the light onto the anode.
References Cited (Backward Citations)
US4244794A
Cited
US4227977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |