Membrane electrode assembly, electrochemical device, and electrochemical system

Patent metadata

Field	Value
Publication number	US-2021399325-A1
Application number	US-202117467314-A
Country	US
Kind code	A1
Filing date	Sep 6, 2021
Priority date	Apr 26, 2019
Publication date	Dec 23, 2021
Grant date	—

Abstract

A membrane electrode assembly according to the present disclosure includes an electrolyte membrane containing a solid electrolyte and a first electrode bonded to the electrolyte membrane, wherein the solid electrolyte is a compound represented by the composition formula (1): BaZr1-xMxO3-γ, M in the composition formula (1) is at least one element selected from the group consisting of Sc, Er, Ho, Dy, Gd, Y, In, Tm, Yb, and Lu, and 0<x<1 and 0<γ<0.5 are satisfied, and the first electrode contains a lanthanum strontium cobalt iron palladium composite oxide.

First claim

What is claimed is:

1 . A membrane electrode assembly comprising:
an electrolyte membrane containing a solid electrolyte; and a first electrode bonded to the electrolyte membrane, wherein the solid electrolyte is a compound represented by the composition formula (1): BaZr 1-x M x O 3-γ , M in the composition formula (1) is at least one element selected from the group consisting of Sc, Er, Ho, Dy, Gd, Y, In, Tm, Yb, and Lu, and 0<x<1 and 0<γ<0.5 are satisfied, and the first electrode contains a lanthanum strontium cobalt iron palladium composite oxide.

2 . The membrane electrode assembly according to claim 1 , wherein M in the composition formula (1) of the solid electrolyte is at least one element selected from the group consisting of Y, Tm, Yb, and Lu.

3 . The membrane electrode assembly according to claim 1 , wherein the solid electrolyte satisfies 0.05<x<0.3 in the composition formula (1).

4 . The membrane electrode assembly according to claim 1 , wherein M in the composition formula (1) of the solid electrolyte is at least one element selected from the group consisting of Lu and Yb.

5 . The membrane electrode assembly according to claim 1 , wherein M in the composition formula (1) of the solid electrolyte is Yb, and x=0.2 is satisfied.

6 . The membrane electrode assembly according to claim 1 , wherein
the lanthanum strontium cobalt iron palladium composite oxide is a compound represented by the composition formula (2): La 1-m Sr m Co y Fe z Pd 1-y-z O 3-δ , and 0≤m≤0.5, 0.1≤y≤0.9, 0.1≤z≤0.9, y+z<1, and 0≤δ≤0.5 are satisfied in the composition formula (2).

7 . The membrane electrode assembly according to claim 6 , wherein the lanthanum strontium cobalt iron palladium composite oxide satisfies 0.01≤1−y−z≤0.05 in the composition formula (2).

8 . The membrane electrode assembly according to claim 6 , wherein the lanthanum strontium cobalt iron palladium composite oxide satisfies m=0.4, y=0.38, and z=0.57 in the composition formula (2).

9 . An electrochemical device comprising:
the membrane electrode assembly according to claim 1 ; and a second electrode, wherein the electrolyte membrane is located between the first electrode and the second electrode.

10 . An electrochemical system comprising the electrochemical device according to claim 9 .

11 . The electrochemical system of claim 10 , further comprising
a temperature controller, wherein the temperature controller is configured to control an operating temperature of the electrochemical device to be 600° C. or less.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Onuma Shigenori
• Kuroha Tomohiro

Classifications

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• H01M4/9033

  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

• H01M4/8657

  layered · CPC title

• 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