Development and performance of A-site rich perovskite-type material for enhanced oxygen evolution reaction in alkaline electrolyte

A-site rich perovskites Ba 2x CoMoO 6 ( x  = 1, 1.1, 1.2, and 1.3) were synthesised by a solid-state reaction method. The as-prepared Ba 2.4 CoMoO 6 catalyst showed good catalytic activity towards oxygen evolution reaction (OER) activity with an overpotential of 420 mV at 10 mA cm −2 , which was enhanced by 100 mV compared with that of Ba 2 CoMoO 6 , with a low Tafel slope of 79 mV dec −1 , an obviously enhanced electrochemical active surface area value, and sharply improved mass and specific activities. The enhanced OER activity even surpassed the precious metal oxide IrO 2 and perovskite benchmark Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ activities.