Membrane electrode assembly, solid oxide fuel cell, and electrochemical device

Patent metadata

Field	Value
Publication number	US-2021408569-A1
Application number	US-202117474502-A
Country	US
Kind code	A1
Filing date	Sep 14, 2021
Priority date	Apr 26, 2019
Publication date	Dec 30, 2021
Grant date	—

Abstract

A membrane electrode assembly according to the present disclosure includes an electrolyte membrane containing a proton conductive oxide and an electrode containing a lanthanum strontium cobalt iron composite oxide located on the electrolyte membrane, wherein, in the electrode, the ratio of the number of moles of cobalt to the sum of the number of moles of cobalt and the number of moles of iron is 0.35 or more and 0.6 or less.

First claim

What is claimed is:

1 . A membrane electrode assembly comprising:
an electrolyte membrane containing a proton conductive oxide; and an electrode containing a lanthanum strontium cobalt iron composite oxide located on the electrolyte membrane, wherein, in the electrode, the ratio of the number of moles of cobalt to the sum of the number of moles of cobalt and the number of moles of iron is 0.35 or more and 0.6 or less.

2 . The membrane electrode assembly according to claim 1 , wherein the electrolyte membrane is in contact with the electrode.

3 . The membrane electrode assembly according to claim 1 , wherein
the electrolyte membrane contains at least one compound selected from the group consisting of BaZr 1-x1 M1 x1 O 3-γ , BaCe 1-x2 M2 x2 O 3-γ , and BaZr 1-x3-y3 Ce x3 M3 y3 O 3-γ , wherein M1, M2, and M3 independently denote at least one element selected from the group consisting of La, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Y, Sc, Mn, Fe, Co, Ni, Al, Ga, In, and Lu, x1 satisfies 0<x1<1, x2 satisfies 0<x2<1, x3 satisfies 0<x3<1, y3 satisfies 0<y3<1, and γ satisfies 0<γ≤0.5.

4 . The membrane electrode assembly according to claim 3 , wherein the electrolyte membrane is a compound represented by BaZr 1-x1 Yb x1 O 3-γ.

5 . The membrane electrode assembly according to claim 1 , wherein the electrode is an air electrode.

6 . A solid oxide fuel cell comprising the membrane electrode assembly according to claim 1 .

7 . An electrochemical device comprising the membrane electrode assembly according to claim 1 .

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Mikami Yuichi
• Goto Takehito
• Onuma Shigenori
• Murase Hideaki
• Kuroha Tomohiro

Classifications

• C25B9/01

  Electrolytic cells characterised by shape or form · CPC title

• C25B9/23

  comprising ion-exchange membranes in or on which electrode material is embedded · CPC title

• Y02P70/50

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

• C25B1/042

  by electrolysis of steam · CPC title

• C25B13/07

  based on ceramics · CPC title