Mesoporous carbon, electrode catalyst for fuel cell, catalyst layer, fuel cell, and method for producing mesoporous carbon

Patent metadata

Field	Value
Publication number	US-12087952-B2
Application number	US-202217656797-A
Country	US
Kind code	B2
Filing date	Mar 28, 2022
Priority date	Mar 30, 2021
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

Mesoporous carbon has a connecting structure in which primary particles made of carbon particles having primary pores with a primary pore diameter of less than 20 nm are connected. In the mesoporous carbon, the pore capacity of secondary pores with secondary pore diameters within a range of 20 nm to 100 nm, which is measured by a mercury intrusion method, is 0.42 cm3/g or more and 1.34 cm3/g or less. In addition, the mesoporous carbon has a linearity of 2.2 or more and 2.6 or less. An electrode catalyst for a fuel cell includes the mesoporous carbon and catalyst particles supported in the primary pores in the mesoporous carbon. Furthermore, a catalyst layer includes the electrode catalyst for the fuel cell and a catalyst layer ionomer.

First claim

What is claimed is:

1. Mesoporous carbon comprising primary particles, wherein
the mesoporous carbon has a connecting structure in which the primary particles are connected,
the primary particles are made of carbon particles having primary pores with a primary pore diameter of less than 20 nm,
a secondary pore diameter of secondary pores of the mesoporous carbon is in a range of 20 nm to 100 nm,
a pore capacity of the secondary pores is 0.42 cm 3 /g or more and 1.34 cm 3 /g or less, the pore capacity being measured by a mercury intrusion method, and
the mesoporous carbon has a distorted shape and a linearity of 2.2 or more and 2.6 or less.

2. The mesoporous carbon according to claim 1 , wherein an average particle diameter of the primary particles is 30 nm or more and 300 nm or less.

3. The mesoporous carbon according to claim 1 , wherein the pore capacity of the secondary pores is 0.42 cm 3 /g or more and 1.00 cm 3 /g or less.

4. An electrode catalyst for a fuel cell comprising:
the mesoporous carbon according to claim 1 ; and
catalyst particles supported in the primary pores of the mesoporous carbon.

5. A catalyst layer comprising:
the electrode catalyst for the fuel cell according to claim 4 ; and
a catalyst layer ionomer.

6. The catalyst layer according to claim 5 , wherein the catalyst layer is an air electrode catalyst layer of the fuel cell.

7. A fuel cell comprising the catalyst layer according to claim 5 .

Assignees

• Toyota Motor Co Ltd

Inventors

• Hasegawa Naoki
• Yano Kazuhisa
• Takeshita Tomohiro
• Imoto Rui
• Nomura Kumiko
• Kitao Noriyuki
• Wang Yunan
• Kasama Yuuki

Classifications

• H01M4/8892

  Impregnation or coating of the catalyst layer, e.g. by an ionomer · CPC title

• H01M4/8605

  Porous electrodes · CPC title

• H01M2004/8689

  Positive electrodes · CPC title

• C01P2006/16

  Pore diameter · CPC title

• C01P2006/14

  Pore volume · CPC title