C/sic composite particles and their manufacturing method, electrode catalyst and polymer electrolyte fuel cell comprising the c/sic composite particles

Patent metadata

Field	Value
Publication number	US-2024246826-A1
Application number	US-202218576059-A
Country	US
Kind code	A1
Filing date	Jun 20, 2022
Priority date	Jul 7, 2021
Publication date	Jul 25, 2024
Grant date	—

Abstract

[Problem] To provide a practical solid polymer fuel cell having high cell performance and excellent durability.
[Means for solving] The polymer electrolyte fuel cell according to the present invention includes: a membrane electrode assembly in which electrodes each including a catalyst layer are joined to both surfaces of an electrolyte membrane; and a peroxide decomposition catalyst which is fixed to the electrolyte membrane and/or the electrodes and includes a hardly soluble carbide, a boride, and/or a silicide. The peroxide decomposition catalyst preferably contains a carbide, a boride and/or a silicide of a rare earth element, a transition metal element or a typical metal element.

First claim

1 . C/SiC composite particles, comprising:
porous carbon particles; and SiC particles distributed on inner wall surfaces of pores of the porous carbon particles.

2 . The C/SiC composite particles according to claim 1 , wherein a mode diameter of the pores of the porous carbon particles is 1.5 nm or more to 5.0 nm or less.

3 . The C/SiC composite particles according to claim 1 , wherein an average primary particle diameter of the SiC particles is the mode diameter or less of the pores of the porous carbon particles.

4 . The C/SiC composite particles according to claim 1 , wherein an Si mass rate is more than 0 mg/m 2 to not more than 6.8 mg/m 2 , the “Si mass rate” meaning a rate of the mass of Si per unit surface area of the C/SiC composite particles.

5 . The C/SiC composite particles according to claim 1 , wherein an average primary particle diameter is 50 nm or more to 200 nm or less.

6 . The C/SiC composite particles according to claim 1 , wherein a pore volume is 0.5 cc/g or more to 2.0 cc/g or less.

7 . The C/SiC composite particles according to claim 1 , further comprising a —OH group and/or a —COOH group introduced on the surfaces of the porous carbon particles.

8 . A method for manufacturing C/SiC composite particles, comprising:
a first process of preparing porous silica particles acting as a template; a second process of precipitating carbon in pores of the porous silica particles and obtaining a silica/carbon composite A; a third process of removing a part of the silica from the silica/carbon composite A and obtaining a silica/carbon composite B; and a fourth process of obtaining the C/SiC composite particles according to claim 1 by heat-treating the silica/carbon composite B and graphitizing the carbon and simultaneously reacting the silica with a part of the carbon and generating SiC.

9 . The method for manufacturing a C/SiC composite according to claim 8 , wherein the third process includes a process of removing a part of the silica from the silica/carbon composite A so that an Si mass rate of the C/SiC composite particles is more than 0 mg/m 2 to not more than 6.8 mg/m 2 .

10 . The method for manufacturing C/SiC composite particles according to claim 8 , wherein the fourth process includes a process of heat-treating the silica/carbon composite B at a temperature of 1,300° C. or higher to 2,300° C. or lower.

11 . The method for manufacturing C/SiC composite particles according to claim 8 , wherein the fourth process includes a process of heat-treating the silica/carbon composite B in an inert gas atmosphere or under vacuum.

12 . The method for manufacturing C/SiC composite particles according to claim 8 , further comprising a fifth process of performing activation treatment to introduce a —OH group and/or a —COOH group on the surfaces of the porous carbon particles after the fourth process.

13 . An electrode catalyst, comprising:
the C/SiC composite particles according to claim 1 ; and catalyst particles supported on the surfaces of the C/SiC composite particles.

14 . A polymer electrolyte fuel cell including the electrode catalyst according to claim 13 as a cathode catalyst or an anode catalyst.

Assignees

• Toyota Chuo Kenkyusho Kk
• Toyota Motor Co Ltd
• Cataler Corp

Inventors

• Takeshita Tomohiro
• Yano Kazuhisa
• Imoto Rui
• Kitao Noriyuki
• Yamamoto Kenji
• Kitayama Godai

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01P2002/08

  Intercalated structures, i.e. with atoms or molecules intercalated in their structure · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title