Method for producing fine catalyst particle and fuel cell comprising fine catalyst particle produced by the production method

Patent metadata

Field	Value
Publication number	US-10103388-B2
Application number	US-201314890181-A
Country	US
Kind code	B2
Filing date	May 13, 2013
Priority date	May 13, 2013
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

Disclosed is a method for producing a fine catalyst particle comprising a palladium-containing particle and a platinum outermost layer covering the palladium-containing particle, wherein a first composite body containing palladium and platinum is formed by mixing the palladium-containing particle with a first solution in which a platinum compound is dissolved, and then covering at least part of a surface of the palladium-containing particle with platinum; wherein a second composite body containing palladium, platinum and copper is formed by mixing the first composite body with a second solution in which a copper compound is dissolved, and then covering at least part of a surface of the first composite body with copper using copper underpotential deposition; and wherein the copper in the second composite body is substituted with platinum derived from a third solution in which a platinum compound is dissolved.

First claim

The invention claimed is:

1. A method for producing a fine catalyst particle comprising a palladium-containing particle and a platinum outermost layer covering the palladium-containing particle,
wherein a first composite body containing palladium and platinum is formed by mixing the palladium-containing particle with a first solution in which a platinum compound is dissolved, and, as a result of bringing the palladium-containing particle into direct contact with the first solution, then covering at least part of a surface of the palladium-containing particle with platinum;
wherein a second composite body containing palladium, platinum and copper is formed by mixing the first composite body with a second solution in which a copper compound is dissolved, and then covering at least part of a surface of the first composite body with copper using copper underpotential deposition;
wherein the copper in the second composite body is substituted with platinum derived from a third solution in which a platinum compound is dissolved, by mixing the second composite body with the third solution; and
wherein an amount of platinum atoms contained in the first solution is 70 atm % or less, when a minimum amount of platinum atoms required to cover the palladium-containing particle with a monatomic layer of platinum is 100 atm %.

2. The method for producing the fine catalyst particle according to claim 1 , wherein the palladium-containing particle is supported on a carrier.

3. The method for producing the fine catalyst particle according to claim 1 , wherein the palladium-containing particle is subjected to an acid treatment in advance, before the first composite body is formed.

4. The method for producing the fine catalyst particle according to claim 2 , wherein the palladium-containing particle is subjected to an acid treatment in advance, before the first composite body is formed.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kaneko Keiichi
• Fujisawa Tsugio
• Kitao Noriyuki
• Adachi Makoto

Classifications

• H01M4/8807

  Gas diffusion layers · CPC title

• H01M4/88

  Processes of manufacture · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M4/9075

  Catalytic material supported on carriers, e.g. powder carriers (H01M4/8807, H01M4/881, H01M4/8814, H01M4/925 take precedence) · CPC title

• H01M4/925 Primary

  supported on carriers, e.g. powder carriers · CPC title