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

摘要

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_2CoMoO_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.