Electrode catalyst for fuel cell, method for producing the same, electrode catalyst layer for fuel cell comprising the catalyst, and membrane electrode assembly for fuel cell and fuel cell using the catalyst or the catalyst layer

Abstract

Provided is a catalyst for fuel cell which has a high catalytic activity and enables maintaining the high catalytic activity. Disclosed is an electrode catalyst for fuel cell comprising a catalyst carrier containing carbon as a main component and a catalytic metal supported on the catalyst carrier, wherein the catalyst has the R' (D′/G intensity ratio) of 0.6 or less, which is the ratio of D′ band peak intensity (D′ intensity) measured in the vicinity of 1620 cmrelative to G band peak intensity (G intensity) measured in the vicinity of 1580 cmby Raman spectroscopy, and the volume ratio of a water vapor adsorption amount relative to a nitrogen adsorption amount at a relative pressure of 0.5 in adsorption isotherm is 0.15 or more and 0.30 or less.