USE OF AN ANODE CATALYST LAYER

摘要

The use of an anode catalyst layer in a proton exchange membrane fuel cell, the anode catalyst layer comprising a carbon monoxide tolerant catalyst material, wherein the catalyst material comprises : (i) a binary alloy of PtX, wherein X is a metal selected from the group consisting of rhodium and osmium, and wherein the atomic percentage of platinum in the alloy is from 45 to 80 atomic% and the atomic percentage of X in the alloy is from 20 to 55 atomic%; and (ii) a support material on which the PtX alloy is dispersed; wherein the total loading of platinum group metals (PGM) in the anode catalyst layer is from 0.01 to 0.2 mgPGM/cm2; and wherein during operation of the fuel cell an impure hydrogen stream comprising up to 5ppm carbon monoxide is fed to the anode is disclosed.