Proton conductor

Patent metadata

Field	Value
Publication number	US-9437343-B2
Application number	US-201414469316-A
Country	US
Kind code	B2
Filing date	Aug 26, 2014
Priority date	Jul 16, 2013
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

An exemplary proton conductor according to the present disclosure has a perovskite-type crystal structure expressed by the compositional formula A a B 1-x B′ x O 3-δ . The A element is an alkaline-earth metal and is contained in a range of 0.4<a<0.9, where the a value represents a mole fraction of this element, and the B′ element is a trivalent group 3 or group 13 element and is contained in a range of 0.2<x<0.6, where the x value represents a mole fraction of this element.

First claim

What is claimed is:

1. A proton conductor having a perovskite-type crystal structure expressed by the compositional formula A a B 1-x B′ x O 3-δ , wherein:
the proton conductor is composed of a single phase which is substantially uniform in composition and crystal structure,
A is at least one selected from among alkaline-earth metals,
B is a tetravalent group 4 transition metal or Ce, and
B′ is a trivalent group 3 or group 13 element,
where 0.4<a<0.9 and 0.2<x<0.6 are satisfied.

2. The proton conductor of claim 1 , wherein:
A is at least one selected from among Ba and Sr,
B is Zr, and
B′ is Y or In.

3. The proton conductor of claim 1 , wherein:
0.4<a<0.8, and
0.3<x<0.6.

4. The proton conductor of claim 1 , wherein:
0.4<a<0.8, and
0.4<x<0.6.

5. The proton conductor of claim 1 , wherein:
0.4<a<0.6, and
0.4<x<0.6.

6. The proton conductor of claim 1 , wherein:
0.4<a<0.5, and
0.4<x<0.6.

7. The proton conductor of claim 1 , wherein an activation energy of proton conduction in a temperature range of not less than 100° C. and not more than 500° C. is 0.1 eV or less.

8. The proton conductor of claim 1 , wherein the following relationship is satisfied:
0.21 ≦x≦ 0.58;
a≧− 0.054 x+ 0.441; and
a≦− 0.027 x+ 0.886.

Assignees

• Panasonic Corp
• Panasonic Ip Man Co Ltd

Inventors

• Zenitani Yuji
• Nishihara Takashi

Classifications

• H01M8/1027

  having carbon, oxygen and other atoms, e.g. sulfonated polyethersulfones [S-PES] · CPC title

• H01B1/08 Primary

  oxides · CPC title

• C04B2235/3215

  Barium oxides or oxide-forming salts thereof · CPC title

• Y02E60/50

  Fuel cells · CPC title