Release time:2021-03-15 Hits:
- Key Words:Phosphorus compounds;Catalyst activity - Cobalt compounds - Doping (additives) - Electrocatalysts - Electrolytic reduction - Fuel cells - Metal-air batteries - Molybdenum compounds - Perovskite - Phosphorus - Potassium hydroxide - Rotating disks - Strontium compounds - X ray photoelectron spectroscopy
- 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 SrCo<inf>0.5</inf>Mo<inf>0.5</inf>O<inf>3</inf> 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 SrCo<inf>0.5</inf>Mo<inf>0.5</inf>O<inf>3</inf> perovskites without doping, rotating disk electrode measurements indicates that P-doped SrCo<inf>0.5</inf>Mo<inf>0.5</inf>O<inf>3</inf> exhibits a positively shifted half-wave potentional of 50 mV for ORR, and a reduced OER overpotential (∼58 mV) at 10 mA cm<sup>−2</sup> 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.<br/> © 2018 Hydrogen Energy Publications LLC
- Volume:43
- Issue:45
- Translation or Not:no
