IrO2-incorporated La0.8Sr0.2MnO3 as a bifunctional oxygen electrocatalyst with enhanced activities

摘要: Developing low-cost and highly efficient oxygen electrocatalysts for both the evolution reaction (OER) reduction (ORR) has become one important issue recently due to sluggish kinetics of these two reactions, which require high overpotentials thus energy input. Perovskite oxides have emerged as a new class non-precious metal catalysts electrocatalysis in alkaline media. In this work, an IrO2-incorporated La0.8Sr0.2MnO3 composite been developed novel bifunctional electrocatalyst using polymer-assisted approach with subsequent wet impregnation–calcination method. Due synergistic effect between ORR activity good OER IrO2 well improved electrochemically active surface area, electrocatalytic activities improved, compared those pristine (ΔE = 1.043 V), resulting its enhanced bifunctionality 0.652 V) catalyst solution, is also superior reported state-of-the-art electrocatalysts. The stability test shows that after 1000 cycles cyclic voltammetry (CV), there only 15 mV positive shift achieving current density 10 mA cm−2 17 negative reach −1 ORR, indicates (5 wt% incorporated La0.8Sr0.2MnO3) solution. Our study not reports material electrocatalyst, but opens avenue develop perovskite oxide-based activities.