Catalyst composition and carbon material having nitrogen-containing group

Patent metadata

Field	Value
Publication number	US-12208374-B2
Application number	US-202117909084-A
Country	US
Kind code	B2
Filing date	Mar 5, 2021
Priority date	Mar 6, 2020
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

When a metal catalyst is used as a catalyst in a catalyst layer of a polymer electrolyte fuel cell, improvement in catalytic activity and improvement in durability of the metal catalyst are intended. The catalyst composition of the present invention comprises a metal catalyst, a carbon material having a nitrogen-containing group on which the metal catalyst is carried, and an ionomer.

First claim

The invention claimed is:

1. A catalyst composition which comprises
a metal catalyst,
a carbon material having a nitrogen-containing group on which the metal catalyst is carried, and
an ionomer,

wherein the nitrogen-containing group is at least one kind selected from the following groups:

2. The catalyst composition according to claim 1 , wherein the nitrogen-containing group contains at least one kind selected from the group consisting of an imidazoline structure, an amidine structure, an amide bond and a cyano group.

3. The catalyst composition according to claim 1 , wherein the carbon material is at least one kind selected from the group consisting of carbon black, graphitized carbon black, natural graphite, artificial graphite, single layer graphene, multilayer graphene, single-walled carbon nanotube, multi-walled carbon nanotube, fullerene, diamond-like carbon, activated carbon, coke and carbon fiber.

4. The catalyst composition according to claim 1 , wherein the ionomer has a sulfonic acid group.

5. A method for using the catalyst composition according to of claim 1 to prepare a catalyst layer of a solid polymer fuel cell, comprising coating the catalyst composition on a substrate and drying a solvent to form said catalyst layer of said polymer fuel cell.

6. A catalyst composition which comprises
a metal catalyst,
a carbon material having a nitrogen-containing group on which the metal catalyst is carried, and
an ionomer,

wherein the carbon material having a nitrogen-containing group is obtained by reacting the carbon material and an azo compound having a nitrogen-containing group.

7. A catalyst layer for a polymer electrolyte fuel cell, which comprises the catalyst composition according to claim 1 or 6 .

8. A membrane electrode assembly, which comprises a polymer electrolyte membrane, a gas diffusion layer and the catalyst layer for a polymer electrolyte fuel cell according to claim 7 .

9. A polymer electrolyte fuel cell, which comprises the membrane electrode assembly according to claim 8 .

10. A carbon material having a nitrogen-containing group, wherein the nitrogen-containing group is at least one kind selected from the following groups

Assignees

• Nissan Chemical Corp
• National Univ Corporation Oita Univ

Inventors

• Nakazawa Taichi
• Kinumoto Taro

Classifications

• B01J31/18

  containing nitrogen, phosphorus, arsenic or antimony {as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms (double metal cyanides B01J27/26; N-heterocyclic carbenes B01J31/2265)} · CPC title

• B01J27/02

  Sulfur, selenium or tellurium; Compounds thereof · CPC title

• B01J23/00

  Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 (B01J21/16 takes precedence) · CPC title

• H01M4/8668

  Binders · CPC title

• H01M4/9008

  Organic or organo-metallic compounds · CPC title