Nanosized IrOx and IrRuOx electrocatalysts for the O2 evolution reaction in PEM water electrolysers

- IrOx and Ir0.7Ru0.3Ox of similar crystallite size, 5 nm, were investigated in a PEM-WE.
- The Ir0.7Ru0.3Ox showed a performance of 3.2 A cm−2 at 1.85 V at 90 °C.
- The results indicate promising performance of the Ir0.7Ru0.3Ox in a PEM electrolyzer.