US4407907A
Expired / Lapsed
US
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Air electrode
Assignee: Toshiba Corp
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Filing: 1981-11-30
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Granted: 1983-10-04
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Expires: 2001-11-30
Abstract
Abstract An air electrode to be used for carrying out electrochemical reduction of an oxygen gas, which comprises an electrode body composed of a porous body and a fluorine-containing solvent incorporated therein. The air electrode is suitable for use in a hydrogen/oxygen fuel cell, a metal/air cell or an oxygen sensor.
Inventors
- 👤 Tsutomu Takamura
- 👤 Yuichi Sato
- 👤 Toshiaki Nakamura
- 👤 Nobukazu Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:49
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
72 words
An air electrode for use in carrying out electrochemical reduction of an oxygen gas, which comprises an electrode body comprised of a porous body and a fluorine-containing solvent incorporated therein, said fluorine-containing solvent being a liquid at room temperature and having a boiling point of from about 50° to 350° C., an oxygen-dissolving power of at least about 15% by volume, and a surface tension of not greater than about 50 dyne/cm.
Claim 2
Dependent Claim
72 words
An air electrode for use in carrying out electrochemical reduction of an oxygen gas, which comprises an electrode body comprised of a porous body and a fluorine-containing solvent incorporated therein, said fluorine-containing solvent being a liquid at room temperature and having a boiling point of from about 50° to 350° C., an oxygen-dissolving power of at least about 15% by volume, and a surface tension of not greater than about 50 dyne/cm.
Claim 3
Dependent Claim
41 words
An air electrode as claimed in claim 1, wherein said fluorine-containing solvent has a boiling point of from 50° to 350° C., an oxygen-dissolving power of at least 15% by volume, and a surface tension of not greater than 50 dyne/cm.
Claim 4
Dependent Claim
41 words
An air electrode as claimed in claim 1, wherein said fluorine-containing solvent has a boiling point of from 100° to 300° C., an oxygen-dissolving power of at least 25% by volume, and a surface tension of not greater than 40 dyne/cm.
Claim 5
Dependent Claim
44 words
An air electrode as claimed in claim 3, wherein said fluorine-containing solvent is selected from the group consisting of fluorohalogenides; perfluoro alkanes; perfluoro alkenes; cyclic fluoride compounds; perfluorohydrides; perfluorocarboxylic acids; perfluoroketones; perfluoroaldehydes; perfluoroalcohols; perfluoroethers; amine fluorides; perfluorothiols; perfluorosulfonic acids; and organic-phosphorus compound-arsenic compound-fluorine derivatives.
Claim 6
Dependent Claim
65 words
An air electrode as claimed in claim 4, wherein said fluorine-containing solvent is selected from the group consisting of a low polymer of 1-chloro-1,2,2-trifluoroethylene, perfluoropentane, perfluorohexane, CF 3 -CF═CF-CF 3 , tetrafluorobenzene, perfluoro-1,3,5-trimethylcyclohexane, H(CF 2 ) 2 F, H(CF 2 CF 2 ) n -COOH (n=3 to 30), C 4 F 9 O and (C 3 F 7 ) 2 NC 4 F 9 .
Claim 7
Dependent Claim
18 words
An air electrode as claimed in claim 5, wherein said fluorine-containing solvent is a low polymer of 1-chloro-1,2,2-trifluoroethylene.
Claim 8
Dependent Claim
31 words
An air electrode as claimed in claim 1, wherein an amount of the incorporated fluorine-containing solvent is from 0.0001 to 30% by weight relative to the weight of the porous body.
Claim 9
Dependent Claim
34 words
An air electrode for use in carrying out electrochemical reduction of an oxygen gas, which comprises an electrode body comprised of a porous body having incorporated therein a fluorine-containing solvent and a perfluoro compound.
Claim 10
Dependent Claim
34 words
An air electrode for use in carrying out electrochemical reduction of an oxygen gas, which comprises an electrode body comprised of a porous body having incorporated therein a fluorine-containing solvent and a perfluoro compound.
Claim 11
Dependent Claim
23 words
An air electrode as claimed in claim 8, wherein said perfluoro compound is an amine fluoride, a cyclic fluoride compound, and a perfluoroether.
Claim 12
Dependent Claim
34 words
An air electrode as claimed in claim 9, wherein said perfluoro compound is selected from the group consisting of perfluoro-tri-n-butylamine (FC-43), perfluoro-tripropylamine (FTPA), perfluorodecaline (FDC), perfluoromethyldecalin (FMD), and perfluorinated ether (Freon E 4 ).
Claim 13
Dependent Claim
31 words
An air electrode as claimed in claim 8, wherein an amount of the incorporated fluoro compound is from 0.1 to 10% by volume relative to the weight of said fluorine-containing solvent.
Claim 14
Dependent Claim
23 words
An air electrode as claimed in claim 8, wherein a catalyst for an oxygen reduction reaction is concomitantly incorporated in said electrode body.
Claim 15
Dependent Claim
31 words
An air electrode as claimed in claim 12, wherein said catalyst for the oxygen reduction reaction is at least one selected from a metallophthalocyanine, a metalloporphyrin and a dimer of metalloporphyrin.
Claim 16
Dependent Claim
17 words
An air electrode as claimed in claim 8, wherein said porous body is made of active carbon.
Claim 17
Dependent Claim
23 words
An air electrode as claimed in claim 1, wherein a catalyst for an oxygen reduction reaction is concomitantly incorporated in said electrode body.
Claim 18
Dependent Claim
30 words
An air electrode as claimed in claim 1, wherein said catalyst for the oxygen reduction reaction is at least one selected from a metallophthalocyanine, metalloporphyrin and a dimer of metalloporphyrin.
Claim 19
Dependent Claim
17 words
An air electrode as claimed in claim 1, wherein said porous body is made of active carbon.
Claim 20
Dependent Claim
18 words
An air electrode as claimed in claim 2, wherein said fluorine-containing solvent is a liquid at room temperature.
References Cited (Backward Citations)
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Cited
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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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |