Proton conductor, solid electrolyte layer for fuel cell, cell structure, and fuel cell including the same

Patent metadata

Field	Value
Publication number	US-2018037508-A1
Application number	US-201515553237-A
Country	US
Kind code	A1
Filing date	Aug 25, 2015
Priority date	Mar 30, 2015
Publication date	Feb 8, 2018
Grant date	—

Abstract

A solid electrolyte layer contains a proton conductor having a perovskite structure, the proton conductor being represented by formula (1): Ba x Zr y Ce z M 1−(y+z) O 3−δ (where element M is at least one selected from the group consisting of Y, Yb, Er, Ho, Tm, Gd, and Sc, 0.85≦x<0.98, 0.70≦y+z<1.00, a ratio of y/z is 0.5/0.5 to 1/0, and δ is an oxygen vacancy concentration).

First claim

1 . A solid electrolyte layer for a fuel cell, comprising:
a proton conductor having a perovskite structure, the proton conductor being represented by formula (1):
Ba x Zr y Ce z M 1−(y+z) O 3−δ

(where element M is at least one selected from the group consisting of Y, Yb, Er, Ho, Tm, Gd, and Sc, 0.85≦x<0.98, 0.70≦y+z<1.00, a ratio of y/z is 0.5/0.5 to 1/0, and δ is an oxygen vacancy concentration).

2 . The solid electrolyte layer for a fuel cell according to claim 1 , wherein 0.85≦x≦0.96.

3 . The solid electrolyte layer for a fuel cell according to claim 1 , wherein 0.75≦y+z≦0.90.

4 . The solid electrolyte layer for a fuel cell according to claim 1 , wherein the element M is at least one selected from the group consisting of Y and Yb.

5 . The solid electrolyte layer for a fuel cell according to claim 1 ,
wherein letting a thickness of the solid electrolyte layer be T, letting a ratio of Ba at a position 0.25T from one surface of the solid electrolyte layer be x1, and letting a ratio of Ba at a position 0.25T from the other surface of the solid electrolyte layer be x2, x1>x2 is satisfied, and the other surface is brought into contact with a cathode of a fuel cell.

6 . The solid electrolyte layer for a fuel cell according to claim 1 , wherein the ratio of y/z, namely, Zr/Ce, is 0.5/0.5 to 0.9/0.1.

7 . A cell structure comprising:
a cathode; an anode; and a protonically conductive solid electrolyte layer arranged between the cathode and the anode, wherein the solid electrolyte layer contains a proton conductor, the proton conductor has a perovskite structure and is represented by formula (1):
Ba x Zr y Ce z M 1−(y+z) O 3-δ

(where element M is at least one selected from the group consisting of Y, Yb, Er, Ho, Tm, Gd, and Sc, 0.85≦x<0.98, 0.70≦y+z<1.00, a ratio of y/z is 0.5/0.5 to 1/0, and δ is an oxygen vacancy concentration).

8 . A fuel cell comprising:
the cell structure according to claim 7 ; an oxidant channel to supply an oxidant to the cathode; and a fuel channel to supply a fuel to the anode.

9 . A proton conductor having a perovskite structure, the proton conductor being represented by formula (1):
Ba x Zr y Ce z M 1−(y+z) O 3-δ
(where element M is at least one selected from the group consisting of Y, Yb, Er, Ho, Tm, Gd, and Sc, 0.85≦x<0.98, 0.70≦y+z<1.00, a ratio of y/z is 0.5/0.5 to 1/0, and δ is an oxygen vacancy concentration).

Assignees

• Sumitomo Electric Industries

Inventors

• Higashino Takahiro
• Noda Yohei
• Hiraiwa Chihiro
• Mizuhara Naho
• Tawarayama Hiromasa
• Takeuchi Hisao
• Majima Masatoshi

Classifications

• H01M8/02

  Details (electrodes H01M4/86 - H01M4/98) · CPC title

• H01B1/06

  mainly consisting of other non-metallic substances · CPC title

• C04B2235/3215

  Barium oxides or oxide-forming salts thereof · CPC title

• C04B35/62222

  obtaining ceramic coatings (coating of mortars, concrete, artificial or natural stone or ceramics C04B41/45; laminated ceramic products B32B18/00; coating of glass C03C17/00, applying ceramic coatings on silicon for semi-conductor purposes H10W; coating metallic materials C23) · CPC title

• C04B35/6261

  Milling · CPC title