Abstract
A-site rich perovskites Ba2xCoMoO6 (x = 1, 1.1, 1.2, and 1.3) were synthesised by a solid-state reaction method. The as-prepared Ba2.4CoMoO6 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 Ba2CoMoO6, 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 IrO2 and perovskite benchmark Ba0.5Sr0.5Co0.8Fe0.2O3-δ activities.
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