# US 12,191,544 B2 · Membrane electrode assembly, electrochemical device, and electrochemical system

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- Number: US 12,191,544 B2
- Document ID: US12191544B2
- Status: Granted
- Kind: B2
- Application number: 17/467,314
- Filed: 2021-09-06
- Published: 2021-12-23
- Granted: 2025-01-07
- Earliest claimed: 2019-04-26
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Shigenori Onuma; Tomohiro Kuroha
- Web page: https://patentgrep.com/patent/US12191544B2

## CPC

- H01M 8/12: operating at high temperature, e.g. with stabilised ZrO2 electrolyte
- H01M 8/1213: characterised by the electrode/electrolyte combination or the supporting material
- C25B 1/02: Hydrogen or oxygen
- C25B 1/042: by electrolysis of steam
- C25B 9/01: Electrolytic cells characterised by shape or form
- C25B 9/23: comprising ion-exchange membranes in or on which electrode material is embedded
- C25B 11/077: the compound being a non-noble metal oxide
- C25B 13/07: based on ceramics
- H01M 4/8605: {Porous electrodes}
- H01M 4/8657: {layered}
- H01M 4/9033: {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}
- H01M 8/04701: Temperature
- H01M 8/1004: characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence)
- H01M 8/1253: the electrolyte containing zirconium oxide
- G01N 27/4073: {Composition or fabrication of the solid electrolyte}
- Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
- Y02E 60/50: Fuel cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## 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.

## Claims

### Claim 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): 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 0.05<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): La1-mSrmCOyFezPd1-y-zO3-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).

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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).

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 6)

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

### Claim 8 (depends on 7)

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.