Abstract: An oxygen evolution reaction catalyst includes a solid solution of at least one valve metal oxide and at least one noble metal oxide, wherein the valve metal oxide is selected from oxides of titanium, oxides of niobium, oxides of tungsten and oxides of tantalum, the noble metal oxide is selected from oxides of iridium, oxides of ruthenium and/or mixtures and/or alloys thereof, the BET specific surface area of the solid solution is greater than 10 m2/g, and the oxygen evolution reaction catalyst exhibits a weight loss of less than 2% by weight upon exposure of the oxygen evolution reaction catalyst to a 3.3 vol % hydrogen stream in argon at a temperature of 80° C. for 12 hours.

Abstract: An oxygen evolution reaction catalyst includes iridium oxide that exhibits a weight loss of less than 1% by weight upon exposure of the oxygen evolution reaction catalyst to a 3.3 vol % hydrogen stream in argon at a temperature of 80° C. for 12 hours and has a BET specific surface area of more than 15 m2/g.

Abstract: A fuel cell membrane-electrode assembly includes a support material including a ceramic material and iridium oxide, wherein a weight fraction of iridium oxide, based on metallic iridium, with respect to the total weight of the support material, is at most 50 wt%, and the support material has a weight loss of less than 3 wt%, based on the weight fraction of the iridium oxide on exposure of the support material to a 3.3 vol% hydrogen stream in argon at a temperature of 80° C. for 12 hours.