Proton conductor, fuel cell, and water electrolysis device

Patent metadata

Field	Value
Publication number	US-2022149387-A1
Application number	US-202017436399-A
Country	US
Kind code	A1
Filing date	Feb 12, 2020
Priority date	Mar 13, 2019
Publication date	May 12, 2022
Grant date	—

Abstract

Provided is a proton conductor that achieves an improvement in transport number while suppressing a decrease in conductivity. The proton conductor contains a metal oxide having a perovskite structure and represented by formula (1): A a B 1-x-y B′ x M y O 3-δ (1), wherein an element A is at least one element selected from the group consisting of Ba, Sr, and Ca, an element B is at least one element selected from the group consisting of Zr and Ce, an element B′ is Hf, an element M is at least one element selected from the group consisting of Y, Yb, Er, Ho, Tm, Gd, In, and Sc, δ is an oxygen deficiency amount, and “a”, “x”, and “y” satisfy 0.9≤a≤1.0, 0.1≤y≤0.2, and 0<x(1−y)≤0.2.

First claim

1 : A proton conductor containing a metal oxide having a perovskite crystal structure and represented by formula (1):
A a B 1-x-y B′ x M y O 3-δ   (1),
wherein
an element A is at least one element selected from the group consisting of barium, strontium, and calcium,
an element B is at least one element selected from the group consisting of zirconium and cerium,
an element B′ is hafnium,
an element M is at least one element selected from the group consisting of yttrium, ytterbium, erbium, holmium, thulium, gadolinium, indium, and scandium,
δ is an oxygen deficiency amount,
“a” satisfies 0.9≤a≤1.0, and
“x” and “y” satisfy 0.1≤y≤0.2 and 0<x/(1−y)≤0.2.

2 : The proton conductor according to claim 1 , wherein the element B is zirconium.

3 : The proton conductor according to claim 1 , wherein the element A is barium.

4 : The proton conductor according to claim 1 , wherein the element M is yttrium.

5 : The proton conductor according to claim 1 , wherein x/(1−y) satisfies 0.005≤x/(1−y)≤0.013.

6 : The proton conductor according claim 1 , wherein
an X-ray absorption fine structure spectrum of the metal oxide has an absorption peak in an X-ray energy range from 9550 eV to 9570 eV, and the absorption peak includes at least two peaks.

7 : A fuel cell comprising a cell structure having a cathode, an anode, and an electrolyte layer located between the cathode and the anode, wherein
the electrolyte layer contains a proton conductor, and the proton conductor contains a metal oxide having a perovskite crystal structure and represented by formula (1):
A a B 1-x-y B′ x M y O 3-δ   (1),

wherein
an element A is at least one element selected from the group consisting of barium, strontium, and calcium,
an element B is at least one element selected from the group consisting of zirconium and cerium,
an element B′ is hafnium,
an element M is at least one element selected from the group consisting of yttrium, ytterbium, erbium, holmium, thulium, gadolinium, indium, and scandium,
δ is an oxygen deficiency amount,
“a” satisfies 0.9≤a≤1.0, and
“x” and “y” satisfy 0.1≤y≤0.2 and 0<x/(1−y)≤0.2.

8 : A water electrolysis device comprising a cell structure having a cathode, an anode, and an electrolyte layer located between the cathode and the anode, wherein
the electrolyte layer contains a proton conductor, and the proton conductor contains a metal oxide having a perovskite crystal structure and represented by formula (1):
A a B 1-x-y B′ x M y O 3-δ   (1),

wherein
an element A is at least one element selected from the group consisting of barium, strontium, and calcium,
an element B is at least one element selected from the group consisting of zirconium and cerium,
an element B′ is hafnium,
an element M is at least one element selected from the group consisting of yttrium, ytterbium, erbium, holmium, thulium, gadolinium, indium, and scandium,
δ is an oxygen deficiency amount,
“a” satisfies 0.9≤a≤1.0, and
“x” and “y” satisfy 0.1≤y≤0.2 and 0<x/(1−y)≤0.2.

Assignees

• Sumitomo Electric Industries

Inventors

• Higashino Takahiro
• Noda Yohei
• Ogawa Mitsuyasu
• Majima Masatoshi
• Goto Kazuhiro

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• H01M4/9033 Primary

  Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites · CPC title

• H01M2300/0074

  Ion conductive at high temperature · CPC title

• C25B13/07 Primary

  based on ceramics · CPC title