OXYGEN EVOLUTION CATALYST, PRODUCTION AND USE OF SAME, MEMBRANE ELECTRODE ARRANGEMENT AND FUEL CELL OR ELECTROLYTIC CELL

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 m/g.