Abstract
Perovskite oxide has attracted wild attentions as a promising bifunctional electrocatalyst family for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in fuel cells and metal-air batteries. Here, phosphorus-doped SrCo0.5Mo0.5O3 perovskites has been prepared and evaluated as bifunctional oxygen electrocatalyst. X–ray diffraction and X-ray photoelectron spectroscopy results show that P-doping benefits the formation of more stable tetragonal phase, and the generation of more surface adsorbed oxygen species. Compared with SrCo0.5Mo0.5O3 perovskites without doping, rotating disk electrode measurements indicates that P-doped SrCo0.5Mo0.5O3 exhibits a positively shifted half-wave potentional of 50 mV for ORR, and a reduced OER overpotential (∼58 mV) at 10 mA cm−2 in 0.1 M KOH solution. The enhanced catalytic activities and stabilities contribute to optimized surface characteristic and stable phase structure. The work not only provides a new strategy to develop efficient bifunctional oxygen catalysts, but also enriches knowledge of perovskite oxides.
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