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

Patent metadata

Field	Value
Publication number	US-2016072133-A1
Application number	US-201414786632-A
Country	US
Kind code	A1
Filing date	Apr 14, 2014
Priority date	Apr 25, 2013
Publication date	Mar 10, 2016
Grant date	—

Abstract

The present invention has an object to provide a catalyst having excellent oxygen reduction reaction activity. The present invention relates to a catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support, wherein a specific surface area of the catalyst per support weight is 715 m 2 /g support or more or a covering ratio of the catalyst metal with an electrolyte is less than 0.5, and an amount of an acidic group of the catalyst per support weight is 0.75 mmol/g support or less.

First claim

1 .- 9 . (canceled)

10 . A catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support,
wherein the catalyst metal is supported inside pores having a radius of 1 nm or more of the catalyst support, wherein a specific surface area of the catalyst per support weight is 1200 m 2 /g support or more, and wherein an amount of an acidic group of the catalyst per support weight is 0.75 mmol/g support or less.

11 . The catalyst according to claim 10 , wherein a covering ratio of the catalyst metal with an electrolyte is less than 0.5.

12 . The catalyst according to claim 10 , wherein the support includes a metal oxide or carbon.

13 . The catalyst according to claim 10 , wherein the acidic group is at least one selected from the group consisting of a hydroxyl group, a lactone group, and a carboxyl group.

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

15 . The catalyst according to claim 10 , wherein an amount of the catalyst metal supported on the support is 50 wt % or less.

16 . An electrode catalyst layer for fuel cell, comprising the catalyst set forth in claim 10 , and an electrolyte.

17 . A membrane electrode assembly for fuel cell comprising the electrode catalyst layer for fuel cell set forth in claim 16 .

18 . A fuel cell comprising the membrane electrode assembly for fuel cell set forth in claim 17 .

19 . The catalyst according to claim 11 , wherein the covering ratio of the catalyst metal with an electrolyte is 0.4 or less.

20 . A method of manufacturing the catalyst set forth in claim 10 , comprising:
supporting the catalyst metal on the catalyst support to obtain a catalyst powder; and subjecting the catalyst powder to heat-treatment in a hydrogen atmosphere.

21 . A catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support,
wherein the catalyst metal is supported inside pores having a radius of 1 nm or more of the catalyst support, wherein a specific surface area of the catalyst per support weight is 1700 m 2 /g support or more, and wherein an amount of an acidic group of the catalyst per support weight is 0.75 mmol/g support or less.

Assignees

• Nissan Motor
• Nippon Steel & Sumikin Chem Co

Inventors

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

Classifications

• H01M4/8885

  Sintering or firing · CPC title

• H01M4/8663

  Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• C22F1/14

  of noble metals or alloys based thereon · CPC title

• H01M4/9008

  Organic or organo-metallic compounds · CPC title