Abstract: Oxygen evolution reaction (OER) is central to technologies such as electrochemical water splitting, and developing efficient and low-cost non-precious metal electrocatalysts for OER is of great significance to reducing cell voltage and developing hydrogen production by electrochemical water splitting. Herein, we prepared a carbon, nitrogen co-doped porous Co₂P derived from the metal-organic framework (ZIF-67), which is anchored on bimetallic MXene nanosheets (named MX@MOF-Co₂P). It was used as the OER catalyst and exhibited great electrocatalytic performance with very small overpotentials (246 mV at 10 mA^-2 and 407 mV at 200 mA cm^-2) as well as ultralow Tafel slope (28.18 mV dec^-1). Combining characterizations and theoretical calculations, it was found that the remarkable performance was from follows: the obtained MX@MOF-Co₂P inherited the porous structure of the pristine MOF with a large number of open active sites; carbon and nitrogen doping also modulated the electronic structure of the active center; the synergistic effect between cobalt phosphide and MXenes booted the electronic transfer. This work represents a promising strategy for the development of non-precious metal catalysts derived from metal-organic frameworks to achieve efficient energy conversion.

Key words: Mxene, mof, doping, cobalt phosphide, electrocatalysts