Integrating ZnCo2O4 Submicro-/Nanospheres with CoxSey Nanosheets for Oxygen Evolution Reaction and Zinc Air Batteries
Developing low cost, high-efficiency and robust electrocatalysts to boost oxygen evolution reaction (OER) is of great significance for clean energy storage and conversion devices such as electrochemical water splitting, rechargeable zinc-air batteries, and so on. In this study, we present a facile means to integrate ZnCo2O4 submicro-/nanospheres with CoxSey (x, y denotes the molar ratio of Co and Se, respectively) nanosheets, and such composite exhibited excellent OER activity with an overpotential of 324 mV at 10 mA cm-2 in 1 M KOH. It also exhibited superior long-term stability to the benchmark IrO2 catalyst. In the home-made zinc air battery test, the battery modified by the composite as air cathode showed excellent performance with a small voltage gap of 0.98 V at 50 mA cm-2, a high power density of 212.9 mW cm−2, a high specific capacity of 570.1 mA h g-1, as well as a stable cycling stability (50 h) at 10 mA cm-2 with a round-trip efficiency of 56.3%, superior to the IrO2/C counterpart. This study can provide an avenue for developing cost effective, efficient and durable OER electrocatalysts as alternatives for various renewable energy storage and conversion devices.