Mof-Derived Cop/Cup Hybrids as a Bifunctional Electrocatalyst for Zinc−Air Batteries

Abstract

The metal phosphides (TMPs) have attracted extensive interest to catalyze the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). However, the development of TMPs with high conductivity is a great challenge. Herein, we report a hybrid of cobalt phosphide (CoP) and copper phosphide (CuP) strongly coupled with ZIF-67 derived carbon as bifunctional ORR/OER electrocatalyst (CoP/CuP@NC). The as-prepared CoP/CuP@NC catalysts exhibits delightful activity and stability toward ORR (E1/2 = 0.86 V) and OER (E10 = 1.61 V). Moreover, the assembled Zn−air battery exhibits small charge-discharge voltage gap and excellent stability. The remarkable electrocatalytic capabilities stem from the combined impact of active CoP/CuP components and the structural framework derived from ZIF-derived materials. This work provide a meaningful strategy for constructing high-performance bifuntional electrocatalyst for commercial Zn−air batteries.

Keywords: Metal-organic framework derived carbon, Transition Metal Phosphide, bifunctional electrocatalyst, zinc−air batteries