Ceria/Cobalt Borate Hybrids as Efficient Electrocatalysts for Water Oxidation in Neutral Conditions
Oxygen evolution reaction （OER）catalysts are of importance for electrochemical water splitting and fuel generation. Despite enormous efforts, the design and development of OER catalysts with high catalytic activities in neutral conditions are highly desired but still remain a great challenge. Herein, we report a room temperature chemical route to prepare the xceria/cobalt borate (xCeO2/Co-Bi) hybrids as efficient OER catalyst prepared by tuning the mole ratio of Ce/Co (x represents the amount of CeO2). The optimised catalyst (20CeO2/Co-Bi hybrid) was found to exhibit a remarkable OER catalytic activities with overpotential of 453 mV at a current density of 10 mA cm-2, Tafel slope of 120 mV dec-1 and long-time stability in the neutral medium due to its good conductivity, mass transportation and strong synergetic coupled effects, promising the practical application of Co-based electrochemical materials in energy storage devices.