An IrRuOx catalyst supported by oxygen-vacant Ta oxide for the oxygen evolution reaction and proton exchange membrane water electrolysis

At 0.3 mg Ir cm −2 , IrRuO x /Ta 2 O 5 reduced the OER overpotential to 235 mV@10 mA cm −2 and the PEMWE potential to 1.91 V@2 A cm −2 .