	US 12,272,828 B2
	Electrode catalyst layer for fuel cell, and solid polymer-type fuel cell comprising said electrode catalyst layer
Takuya Kitabatake, Ageo (JP); Joji Miki, Ageo (JP); and Haruka Watanabe, Ageo (JP)
Assigned to Mitsui Mining & Smelting Co., Ltd., (JP)
Appl. No. 17/792,459
Filed by Mitsui Mining & Smelting Co., Ltd., Tokyo (JP)
PCT Filed Feb. 12, 2021, PCT No. PCT/JP2021/005345 § 371(c)(1), (2) Date Jul. 13, 2022, PCT Pub. No. WO2021/172059, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 2020-032391 (JP), filed on Feb. 27, 2020.
Prior Publication US 2023/0049734 A1, Feb. 16, 2023
Int. Cl. H01M 4/92 (2006.01); H01M 4/86 (2006.01); H01M 8/10 (2016.01); H01M 8/1018 (2016.01)

CPC H01M 4/925 (2013.01) [H01M 8/1018 (2013.01); H01M 2004/8684 (2013.01); H01M 2008/1095 (2013.01)]

5 Claims

1. An electrode catalyst layer for a fuel cell, comprising a catalyst/support composite comprising a support and a catalyst supported on the support,

wherein the support contains a titanium oxide,

a surface of the catalyst/support composite has an oxide of at least one element selected from the group consisting of niobium, tantalum, zirconium, and silicon, and

a ratio A2/A1 is from 0.35 to 1.70, wherein A1 is an atomic ratio of titanium on a surface of the catalyst layer and A2 is an atomic ratio of a total of niobium, tantalum, zirconium, and silicon on the surface of the catalyst layer, A1 and A2 being measured by X-ray photoelectron spectroscopy.