Electrode catalyst for fuel cell and method of producing the same, and cathode, anode, and fuel cell including electrode catalyst

Patent metadata

Field	Value
Publication number	US-10734658-B2
Application number	US-201514680316-A
Country	US
Kind code	B2
Filing date	Apr 7, 2015
Priority date	Apr 15, 2014
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

Provided is an electrode catalyst for a fuel cell including: a carbon support; and catalytic metal supported on the carbon support, the catalytic metal being selected from platinum or a platinum alloy, in which the carbon support has a crystallite size of (002) plane of carbon within a range of 5.0 nm or more and has a specific surface area within a range of 95 m2/g to 170 m2/g, and the catalytic metal has a crystallite size of (220) plane of platinum within a range of 4.5 nm or less.

First claim

What is claimed is:

1. An electrode catalyst for a fuel cell comprising:
a carbon support having a plurality of crystallite, a crystallite size of (002) plane of crystallite within a range of 5.0 nm or more, and having a specific surface area within a range of 95 m 2 /g to 170 m 2 /g and
catalytic metal selected from platinum or a platinum alloy and
the catalytic metal has a crystallite size of (220) plane of platinum being equal to or greater than 3.2 nm and smaller than 4.1 nm, and
wherein the catalytic metal is supported on the carbon support.

2. The electrode catalyst according to claim 1 , wherein an intensity ratio of a D-band peak intensity to a G-band peak intensity in a Raman spectrum of the carbon support is lower than 0.9.

3. The electrode catalyst according to claim 1 , wherein the carbon support has at least pores having an average radius of 1.0 nm to 2.5 nm.

4. The electrode catalyst according to claim 1 , wherein the catalytic metal is platinum and has a CO adsorption amount of 24 ml/g-Pt or more.

5. The electrode catalyst according to claim 1 , wherein the catalytic metal is a platinum alloy and has a CO adsorption amount of 18 ml/g-Pt or more.

6. The electrode catalyst according to claim 1 , wherein a support amount of the catalytic metal is within a range of 15 mass % to 35 mass % with respect to a total mass of the electrode catalyst.

7. The electrode catalyst according to claim 1 , wherein a support amount of the catalytic metal is equal to or higher than 4.5 mass % and less than 15 mass % with respect to a total mass of the electrode catalyst.

8. A cathode comprising:
the electrode catalyst according to claim 1 .

9. An anode comprising:
the electrode catalyst according to claim 1 .

10. A fuel cell comprising:
the cathode according to claim 8 .

11. A fuel cell comprising:
the anode according to claim 9 .

Assignees

• Toyota Motor Co Ltd
• Cataler Corp

Inventors

• Nagami Tetsuo
• Tanaka Hiromitsu
• Kataoka Mikihiro
• Ishida Tomohiro

Classifications

• Y02E60/50

  Fuel cells · CPC title

• H01M4/921

  Alloys or mixtures with metallic elements · CPC title

• H01M4/92

  Metals of platinum group (H01M4/94 {, H01M4/9058} take precedence) · CPC title

• H01M4/926 Primary

  on carbon or graphite · CPC title