Proton conductor, proton-conducting cell structure, water vapor electrolysis cell, and method for producing hydrogen electrode-solid electrolyte layer complex

Patent metadata

Field	Value
Publication number	US-11545690-B2
Application number	US-201816767747-A
Country	US
Kind code	B2
Filing date	Nov 16, 2018
Priority date	Nov 29, 2017
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

A proton conductor contains a metal oxide that has a perovskite structure and that is represented by formula (1): AxB1-yMyO3-δ, where an element A is at least one element selected from the group consisting of Ba, Ca, and Sr, an element B is at least one element selected from the group consisting of Ce and Zr, an element M is at least one element selected from the group consisting of Y, Yb, Er, Ho, Tm, Gd, In, and Sc, δ indicates an oxygen deficiency amount, and 0.95≤x≤1 and 0<y≤0.5 are satisfied.

First claim

The invention claimed is:

1. A proton-conducting cell structure comprising:
an oxygen electrode;
a hydrogen electrode; and
a proton conductor interposed between the oxygen electrode and the hydrogen electrode, wherein
the proton conductor containing a metal oxide that has a perovskite structure and that is represented by the following formula (1):
A x B 1-y M y O 3-δ   (1),

where
an element A is at least one element selected from the group consisting of Ba, Ca, and Sr,
an element B is at least one element selected from the group consisting of Ce and Zr,
an element M is at least one element selected from the group consisting of Y, Yb, Er, Ho, Tm, Gd, In, and Sc,
δ indicates an oxygen deficiency amount,
0.95≤x≤1 and 0<y≤0.5 are satisfied,

the hydrogen electrode contains nickel and an element X different from any of the element A, the element B, and the element M, wherein the element X includes at least Mg; and
a ratio R Ni of Ni contained in the proton conductor to a total amount of the element A, the element B, and the element M contained in the proton conductor is equal to or less than 1.2 at %.

2. The proton conductor according to claim 1 , wherein a transport number of ionic conduction of the proton conductor in a humidified oxygen atmosphere at 600° C. is equal to or greater than 0.8.

3. The proton conductor according to claim 1 , wherein the formula (1) satisfies 0.98≤x≤1.

4. The proton conductor according to claim 1 , wherein
the element A includes Ba,
the element B includes Zr, and
the element M includes Y.

5. The proton-conducting cell structure according to claim 1 , wherein the ratio R Ni of Ni is equal to or less than 1.0 at %.

6. A water vapor electrolysis cell comprising the proton-conducting cell structure according to claim 1 .

Assignees

• Univ Kyoto
• Sumitomo Electric Industries

Inventors

• Higashino Takahiro
• Noda Yohei
• Hiraiwa Chihiro
• Mizuhara Naho
• Ogawa Mitsuyasu
• Tawarayama Hiromasa
• Majima Masatoshi
• Uda Tetsuya
• Han Donglin
• Onishi Takayuki

Classifications

• Y02E60/36

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

• C25B1/04

  by electrolysis of water · CPC title

• H01M4/885

  followed by reduction of the catalyst salt precursor · CPC title

• C25B13/07

  based on ceramics · CPC title

• H01B1/08 Primary

  oxides · CPC title