Catalyst for solid polymer fuel cells and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2020052309-A1
Application number	US-201816606180-A
Country	US
Kind code	A1
Filing date	Apr 16, 2018
Priority date	Apr 19, 2017
Publication date	Feb 13, 2020
Grant date	—

Abstract

The present invention relates to a catalyst for solid polymer fuel cells in which catalyst particles including platinum or platinum alloy are supported on a carbon powder carrier. The catalyst of the present invention is a catalyst for solid polymer fuel cells in which the bond energy (Ec) at a gravity center position is 2.90 eV or more and 3.85 eV or less as calculated from a spectrum area of a Pt5d orbit-derived spectrum which is obtained by measuring a valence band spectrum in a range of 0 eV or more and 20 eV or less in the result of subjecting the catalyst particles to X-ray photoelectron spectroscopic analysis.

First claim

1 . A catalyst for solid polymer fuel cells in which catalyst particles including platinum or platinum alloy are supported on a carbon powder carrier, wherein
a bond energy (Ec) at a gravity center position is 2.90 eV or more and 3.85 eV or less as calculated from a spectrum area of a Pt5d orbit-derived spectrum which is obtained by subjecting the catalyst particles to X-ray photoelectron spectroscopic analysis to measure a valence band spectrum in a range of 0 eV or more and 20 eV or less.

2 . The catalyst for solid polymer fuel cells according to claim 1 , wherein a ratio of zerovalent platinum to platinum present on surfaces of the catalyst particles is 75% or more and 100% or less.

3 . The catalyst for solid polymer fuel cells according to claim 1 , wherein the catalyst particles have a particle size of 2 nm or more and 500 nm or less.

4 . The catalyst for solid polymer fuel cells according to claim 1 , wherein a carrying rate of the catalyst particles is 20% or more and 70% or less.

5 . The catalyst for solid polymer fuel cells according to claim 2 , wherein the catalyst particles have a particle size of 2 nm or more and 500 nm or less.

6 . The catalyst for solid polymer fuel cells according to claim 2 , wherein a carrying rate of the catalyst particles is 20% or more and 70% or less.

7 . The catalyst for solid polymer fuel cells according to claim 3 , wherein a carrying rate of the catalyst particles is 20% or more and 70% or less.

Assignees

• Tanaka Precious Metal Ind

Inventors

• Kaieda Takeshi
• Matsutani Koichi

Classifications

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M4/926 Primary

  on carbon or graphite · CPC title

• H01M8/10

  Fuel cells with solid electrolytes · CPC title

• H01M4/8657

  layered · CPC title

• H01M4/921 Primary

  Alloys or mixtures with metallic elements · CPC title