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Proton conductor, method for manufacturing proton conductor, and fuel cell

外国特許コード F140007840
整理番号 3651
掲載日 2014年2月19日
出願国 アメリカ合衆国
出願番号 201313860658
公報番号 20140011103
公報番号 9178239
出願日 平成25年4月11日(2013.4.11)
公報発行日 平成26年1月9日(2014.1.9)
公報発行日 平成27年11月3日(2015.11.3)
優先権データ
  • 特願2012-093175 (2012.4.16) JP
  • 特願2012-250557 (2012.11.14) JP
  • 特願2013-039574 (2013.2.28) JP
発明の名称 (英語) Proton conductor, method for manufacturing proton conductor, and fuel cell
発明の概要(英語) A proton conductor includes a metal ion, an oxoanion, and a molecule capable of undergoing protonation or deprotonation, in which the oxoanion and/or the molecule capable of undergoing protonation or deprotonation coordinates to the metal ion to form a coordination polymer.
The oxoanion is preferably a monomer.
The oxoanion is exemplified by at least one selected from the group consisting of phosphate ion, hydrogenphosphate ion, and dihydrogenphosphate ion.
The molecule capable of undergoing protonation or deprotonation is exemplified by at least one selected from the group consisting of imidazole, triazole, benzimidazole, benzotriazole, and derivatives of them.
従来技術、競合技術の概要(英語) BACKGROUND ART
Patent Literature 1: JP-2002-097272 A
Patent Literature 2: JP-2003-217339 A (US 2004/0151983 A)
Proton-exchange membrane fuel cell systems are desirably simplified and prepared at lower cost.
This demands electrolyte materials that operate at an operating temperature of 100 deg. C. or higher in an atmosphere with no or little humidification.
In contrast, customary proton-exchange membrane fuel cells each include an electrolyte that performs ionic conduction by water as proton carrier.
The electrolyte is represented by perfluorinated sulfonic acid polymers.
The customary proton-exchange membrane fuel cells thereby fail to exhibit satisfactory ionic conduction under operation conditions at a temperature of 100 deg. C. or higher with no or little humidification.
Sol-gel porous glass (Patent Literature 1) and a phosphate hydrogel (Patent Literature 2) have been known as electrolyte materials that less suffer from evaporation of water even at high temperatures.
The techniques disclosed in Patent Literatures 1 and 2 require humidification up approximately to saturated water vapor pressure so as to suppress water evaporation.
The techniques are therefore still insufficient in ionic conductivity and stability under conditions with little humidification.
The customary electrolyte materials fail to have satisfactory ionic conductivity and stability under operation conditions at a high temperature of 100 deg. C. or higher with no or little humidification.

特許請求の範囲(英語) [claim1]
1. A proton conductor comprising: a coordination polymer that is provided as a crystal structure having defined lattice parameters, the crystal structure having stoichiometrically: a plurality of metal ions;
a plurality of oxoanions; and
a plurality of molecules capable of undergoing protonation or deprotonation,
the coordination polymer including a plurality of coordination entities that are repeatedly coordinated to bond the coordination entities with one another,
wherein each coordination entity of the plurality of coordination entities is either a first coordinate entity or a second coordination entity,
the first coordination entity being one metal ion of the plurality of metal ions coordinated with either (i) at least one oxoanion of the plurality of oxoanions or (ii) at least one molecule capable of undergoing protonation or deprotonation of the plurality of molecules capable of undergoing protonation ro deprotonation, and
the second coordination entity being the metal ion coordinated with each of (i) at least one oxoanion of the plurality of oxoanions and (ii) at least one molecule capable of undergoing protonation or deprotonation of the plurality of molecules capable of undergoing protonation or deprotonation.
[claim2]
2. The proton conductor according to claim 1, wherein the plurality of oxoanions are monomers.
[claim3]
3. The proton conductor according to claim 1, wherein the plurality of oxoanions are at least one selected from the group consisting of phosphate ion, hydrogenphosphate ion, and dihydrogenphosphate ion.
[claim4]
4. The proton conductor according to claim 1, wherein the plurality of molecules capable of undergoing protonation or deprotonation are at least one selected from the group consisting of imidazole, triazole, benzimidazole, benzotriazole, and derivatives of them.
[claim5]
5. The proton conductor according to claim 1, wherein the plurality of molecules capable of undergoing protonation or deprotonation are at least one selected from the group consisting of primary amine represented by General Formula R -- NH2; secondary amine represented by General Formula R1 (R2) -- NH; tertiary amine represented by General Formula R1 (R2)(R3) -- N; linearly-catenated carbon diamine; saturated cyclic amine; and saturated cyclic diamine,
wherein R, R1, R2, and R3 are each independently any of alkyl group, aryl group, alicyclic hydrocarbon group, and heterocyclic group.
[claim6]
6. The proton conductor according to claim 1, wherein the plurality of metal ions are at least one selected from the group consisting of cobalt ion, copper ion, zinc ion, and gallium ion.
[claim7]
7. The proton conductor according to claim 1, further comprising: an additive that is at least one selected from the group consisting of a metal oxide, an organic polymer, and an alkali metal ion.
[claim8]
8. The proton conductor according to claim 7, wherein the metal oxide is at least one selected from the group consisting of SiO2, TiO2, Al2O3, WO3, MoO3, ZrO2, and V2O5.
[claim9]
9. The proton conductor according to claim 7, wherein the organic polymer includes an acidic functional group.
[claim10]
10. The proton conductor according to claim 9, wherein the acidic functional group is any one of carboxyl group, sulfonic acid group, and phosphonic acid group.
[claim11]
11. The proton conductor according to claim 7, wherein the alkali metal ion is at least one metal ion selected from the group consisting of Li, Na, K, Rb, and Cs ions.
[claim12]
12. A method for manufacturing the proton conductor according to claim 1, wherein the plurality of metal ions, the plurality of oxoanions, and the plurality of molecules capable of undergoing protonation or deprotonation are mixed at a temperature of 200 deg. C. or lower.
[claim13]
13. A method for manufacturing the proton conductor according to claim 7, wherein the plurality of metal ions, the plurality of oxoanions, and the plurality of molecules capable of undergoing protonation or deprotonation, and the additive are mixed at a temperature of 200 deg. C. or lower.
[claim14]
14. A fuel cell comprising an electrolyte including the proton conductor according to claim 1.
  • 発明者/出願人(英語)
  • ITAKURA TOMOYA
  • ITO MIHO
  • KITAGAWA SUSUMU
  • HORIKE SATOSHI
  • UMEYAMA DAIKI
  • INUKAI MUNEHIRO
  • DENSO
  • KYOTO UNIVERSITY
国際特許分類(IPC)
米国特許分類/主・副
  • 429/408
  • 429/492
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