Carbon-based solid acid

Patent metadata

Field	Value
Publication number	US-12424636-B2
Application number	US-202017441418-A
Country	US
Kind code	B2
Filing date	Mar 23, 2020
Priority date	Mar 22, 2019
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

Provided is a material which can be used in a catalyst layer for a fuel cell and exhibits proton conductive properties. The present invention is directed to a carbon-based solid acid comprising a carbon material having a sulfonic acid group through a linker.

First claim

The invention claimed is:

1. A carbon-based solid acid comprising a carbon material having a sulfonic acid group through a linker, which has a structure represented by the following formula (1):

wherein G represents graphene optionally having at least one member selected from the group consisting of a hydroxyl group, a carboxyl group, a carbonyl group, a formyl group, a sulfonic acid group, an oxysulfonic acid group, a carboxylic acid anhydride structure, a chromene structure, a lactone structure, an ester structure, and an ether structure, k represents an integer of 1 to 5, j represents an integer of 1 to 3, m represents an integer of 1 to 10, and n represents an integer of 2 to 4.

2. A catalyst layer for a fuel cell, containing the carbon-based solid acid according to claim 1 .

3. The catalyst layer for a fuel cell according to claim 2 , wherein the carbon-based solid acid is a kind of electrolyte and a kind of catalyst carrier.

4. The catalyst layer for a fuel cell according to claim 2 , which further contains a perfluorosulfonic acid polymer.

5. The catalyst layer for a fuel cell according to claim 2 , which further contains a binder.

6. A method for producing the carbon-based solid acid according to claim 1 , comprising the step of reacting a carbon material having at least one member selected from the group consisting of a hydroxyl group, a carboxyl group, a carbonyl group, a formyl group, a sulfonic acid group, an oxysulfonic acid group, a carboxylic acid anhydride structure, a chromene structure, a lactone structure, an ester structure, and an ether structure, and a sultone with each other.

7. The method of producing the carbon-based solid acid according to claim 6 , wherein the sultone is at least one member selected from the group consisting of 1,3-propane sultone, 2,4-butane sultone, 1,4-butane sultone, 1,3-butane sultone, and 2,4-pentane sultone.

8. The method of producing the carbon-based solid acid according to claim 6 , wherein the carbon material has a graphene structure in at least part thereof.

9. A composition containing the carbon-based solid acid according to claim 1 and a perfluorosulfonic acid polymer.

10. A method for producing a carbon-based solid acid having a catalyst supported, comprising subjecting a catalyst layer forming composition containing the carbon-based solid acid according to claim 1 and a catalyst to disintegration treatment.

11. The method for producing a carbon-based solid acid having a catalyst supported according to claim 10 , which comprises subjecting a catalyst layer forming composition containing the carbon-based solid acid and a catalyst carrier having a catalyst supported thereon to disintegration treatment.

12. A catalyst layer for a fuel cell, containing a carbon-based solid acid comprising a carbon material having a sulfonic acid group according to claim 1 and a catalyst, wherein the catalyst is supported on the carbon-based solid acid.

13. A method for producing a carbon-based solid acid having a catalyst supported, comprising subjecting a catalyst layer forming composition containing the carbon-based solid acid according to claim 1 and a catalyst to disintegration treatment.

Assignees

• Nissan Chemical Corp

Inventors

• Kondo Shoichi
• Nakazawa Taichi
• Kikuchi Takamasa
• Nohara Yuki
• Kawashima Mitsuyoshi

Classifications

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M4/9075 Primary

  Catalytic material supported on carriers, e.g. powder carriers (H01M4/8807, H01M4/881, H01M4/8814, H01M4/925 take precedence) · CPC title

• H01M4/8668

  Binders · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title