Catalyst and electrode catalyst layer, membrane electrode assembly, and fuel cell using the catalyst

Patent metadata

Field	Value
Publication number	US-2016079605-A1
Application number	US-201414786281-A
Country	US
Kind code	A1
Filing date	Apr 14, 2014
Priority date	Apr 25, 2013
Publication date	Mar 17, 2016
Grant date	—

Abstract

The object of the present invention is to provide a catalyst having an excellent catalyst activity.
In the present invention, a catalyst is configured to include a catalyst support and a catalyst metal supported on the catalyst support, wherein a mode radius of pore distribution of pores of the catalyst is 1 nm or more and less than 5 nm, wherein the mode radius is equal to or less than an average particle radius of the catalyst metal, and wherein a pore volume of the pores is 0.4 cc/g support or more.

First claim

1 .- 9 . (canceled)

10 . A catalyst comprising:
a catalyst support; and a catalyst metal supported on the catalyst support, wherein a mode radius of pore distribution of pores having a radius of 1 nm or more of the catalyst is 1 nm or more and less than 5 nm, wherein the catalyst metal is supported inside the pores of which mode radius is 1 nm or more and less than 5 nm, wherein the mode radius is equal to or less than an average particle radius of the catalyst metal, and wherein a pore volume of the pores of which mode radius is 1 nm or more and less than 5 nm existing in the catalyst is 0.4 cc/g support or more.

11 . The catalyst according to claim 10 , wherein the mode radius is 1 nm or more and 2 nm or less.

12 . The catalyst according to claim 10 , wherein the average particle radius of the catalyst metals is 1.5 nm or more and 2.5 nm or less.

13 . The catalyst according to claim 10 , wherein the catalyst metal is platinum or includes platinum and a metal component other than platinum.

14 . An electrode catalyst layer for fuel cell comprising the catalyst according to claim 10 and an electrolyte.

15 . The electrode catalyst layer for fuel cell according to claim 14 , further comprising a liquid proton conducting material connecting the catalyst metal in the catalyst and the electrolyte in a proton conductible state.

16 . The electrode catalyst layer for fuel cell according to claim 14 , wherein a covering ratio of the electrolyte on the catalyst metal is 0.45 or less.

17 . A membrane electrode assembly for fuel cell comprising the electrode catalyst layer for fuel cell according to claim 14 .

18 . A fuel cell comprising the membrane electrode assembly for fuel cell according to claim 17 .

Assignees

• Nissan Motor
• Nippon Steel & Sumikin Chem Co

Inventors

• Mashio Tetsuya
• Ohma Atsushi
• Takahashi Shinichi
• Akizuki Ken

Classifications

• H01M8/02

  Details (electrodes H01M4/86 - H01M4/98) · CPC title

• H01M4/92 Primary

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

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• H01M2250/20

  Fuel cells in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title