Mea for carbon dioxide reduction including reduction catalyst layer cathode of double-layer structure, assembly for carbon dioxide reduction including the mea, and method for preparing the mea

Patent metadata

Field	Value
Publication number	US-2025333856-A1
Application number	US-202418897850-A
Country	US
Kind code	A1
Filing date	Sep 26, 2024
Priority date	Apr 25, 2024
Publication date	Oct 30, 2025
Grant date	—

Abstract

Embodiments relate to a technology for a membrane electrode assembly (MEA) for carbon dioxide reduction. In particular, the embodiments relate to a technology capable of changing an acidic environment, which is unfavorable to a reaction on the cathode side during a catalytic reaction, into an alkaline environment, which is a problem when a cation exchange membrane is used as a separation membrane, as well as reducing the hydrogen evolution reaction (HER), which is a side reaction.

First claim

What is claimed is:

1 . A membrane electrode assembly (MEA) for CO 2 reduction comprising a cathode layer comprising a gas diffusion layer (GDL) and a catalyst layer; a cation exchange membrane (CEM); and an anode layer comprising an oxidation catalyst,
wherein the catalyst layer of the cathode layer comprises: a first layer comprising a reduction catalyst and an anion exchange ionomer formed on the GDL; and a second layer comprising a carbon-based mixture and an anion exchange ionomer formed on the first layer.

2 . The MEA for CO 2 reduction of claim 1 , wherein the reduction catalyst is any one or more selected from Ag, Au, Zn, Cu, and In.

3 . The MEA for CO 2 reduction of claim 1 , wherein the reduction catalyst is 0.5 mg/cm 2 to 3 mg/cm 2 .

4 . The MEA for CO 2 reduction of claim 1 , wherein a particle size of the reduction catalyst is in a form of nanoparticles of 10 nm or less, in a form of secondary particles in which the nanoparticles are agglomerated, in a form of single particles having an average particle diameter of 0.01 to 2 μm, or in a form of a mixture thereof.

5 . The MEA for CO 2 reduction of claim 1 , wherein the carbon-based mixture is any one or more of carbon black, carbon nanotubes, graphene, carbon nanofibers, and graphitized carbon black.

6 . The MEA for CO 2 reduction of claim 1 , wherein the carbon-based mixture is contained in an amount of 20 to 300 parts by weight based on 100 parts by weight of the reduction catalyst.

7 . The MEA for CO 2 reduction of claim 1 , wherein the anion exchange ionomer is contained in an amount of 50 to 1000 parts by weight based on 100 parts by weight of the reduction catalyst.

8 . An assembly for CO 2 reduction, applying the MEA of claim 1 . 15 9 . A method for preparing a membrane electrode assembly (MEA) for CO 2 reduction, comprising:
preparing a gas diffusion layer; preparing a first layer by coating a mixed solution of a reduction catalyst, an anion exchange ionomer, and a solvent on the gas diffusion layer; and preparing a second layer by coating a mixed solution of a carbon-based mixture and an anion exchange ionomer on the first layer to prepare a cathode layer, and thereafter, laminating a cation exchange membrane and an anode layer on the cathode layer.

10 . The method of claim 9 , wherein each of the preparing of the first layer and the preparing of the second layer comprises a drying process.

Assignees

• Korea Inst Sci & Tech

Inventors

• Lee Woong-Hee
• Oh Hyung-Suk
• Min Byoung-Koun
• Won Da-Hye
• Lee Ung
• Lee Dong-Ki
• Koh Jai-Hyun
• Kim Chan-Sol
• Park Jae-Yong

Classifications

• C25B3/26

  of carbon dioxide · CPC title

• C25B13/08

  based on organic materials · CPC title

• C25B11/032

  Gas diffusion electrodes · CPC title

• C25B11/075

  consisting of a single catalytic element or catalytic compound · CPC title

• C25B11/043

  Carbon, e.g. diamond or graphene · CPC title