Membrane electrode assembly, electrochemical device, and electrochemical system

Patent metadata

Field	Value
Publication number	US-12191544-B2
Application number	US-202117467314-A
Country	US
Kind code	B2
Filing date	Sep 6, 2021
Priority date	Apr 26, 2019
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

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): 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.

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 a 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 0.05<x<0.3 and 0<γ<0.5 are satisfied,
the first electrode contains a lanthanum strontium cobalt iron palladium composite oxide,
the lanthanum strontium cobalt iron palladium composite oxide is a compound represented by a composition formula (2): La 1-m Sr m CO y Fe z Pd 1-y-z O 3-δ ,
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), and
the lanthanum strontium cobalt iron palladium composite oxide satisfies 0.01≤1−y−z≤0.05 in the composition formula (2).

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 M in the composition formula (1) of the solid electrolyte is at least one element selected from the group consisting of Lu and Yb.

4. 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.

5. The membrane electrode assembly according to claim 1 , 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).

6. 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.

7. An electrochemical system comprising the electrochemical device according to claim 6 .

8. The electrochemical system of claim 7 , 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