Catalyst for solid polymer fuel cell and method for producing same

Patent metadata

Field	Value
Publication number	US-10454113-B2
Application number	US-201314400424-A
Country	US
Kind code	B2
Filing date	Jun 19, 2013
Priority date	Jun 25, 2012
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

The present invention is a catalyst for a solid polymer fuel cell including: catalyst particles of platinum, cobalt and manganese; and a carbon powder carrier supporting the catalyst particles, wherein the component ratio (molar ratio) of the platinum, cobalt and manganese of the catalyst particles is of Pt:Co:Mn=1:0.06 to 0.39:0.04 to 0.33, and wherein in an X-ray diffraction analysis of the catalyst particles, the peak intensity ratio of a Co—Mn alloy appearing around 2θ=27° is 0.15 or less on the basis of a main peak appearing around 2θ=40°. It is particularly preferred that the catalyst have a peak ratio of a peak of a CoPt 3 alloy and an MnPt 3 alloy appearing around 2θ=32° of 0.14 or more on the basis of a main peak.

First claim

The invention claimed is:

1. A catalyst for a solid polymer fuel cell comprising:
catalyst particles of platinum, cobalt and manganese; and
a carbon powder carrier supporting the catalyst particles, wherein
the catalyst particles were formed by subjecting the carbon powder carrier to a reduction treatment in a metal salt solution of platinum to form a platinum catalyst, and subjecting the platinum catalyst to metal salt solutions of cobalt and manganese either separately or as a mixture of metal salt solutions of cobalt and manganese,
a molar ratio of the platinum, cobalt and manganese of the catalyst particles is of Pt:Co:Mn=1:0.26 to 0.39:0.04 to 0.13, and
in an X-ray diffraction analysis of the catalyst particles, a peak intensity ratio of a Co—Mn alloy appearing around 2θ=27° is 0.15 or less on the basis of a main peak appearing around 2θ=40°,
wherein in an X-ray diffraction analysis of the catalyst particles, a peak ratio of a peak of a CoPt 3 alloy and an MnPt 3 alloy appearing around 2θ=32° is 0.14 or more on the basis of a main peak appearing around 2θ=40°.

2. The catalyst for a solid polymer fuel cell according to claim 1 , wherein the catalyst particles have a cobalt concentration and manganese concentration at a surface of the catalyst particles which is lower than a cobalt concentration and manganese concentration at a center of the particles.

3. The catalyst for a solid polymer fuel cell according to claim 1 , wherein a supported density of the catalyst particles is from 30 to 70%.

4. The catalyst for a solid polymer fuel cell according to claim 2 , wherein a supported density of the catalyst particles is from 30 to 70%.

Assignees

• Tanaka Precious Metal Ind

Inventors

• Ishida Minoru
• Matsutani Koichi

Classifications

• H01M4/8882

  Heat treatment, e.g. drying, baking · CPC title

• H01M4/8642

  Gradient in composition · CPC title

• H01M4/8652 Primary

  as mixture · CPC title

• H01M4/8657

  layered · CPC title

• H01M4/921

  Alloys or mixtures with metallic elements · CPC title