Constructing heterostructures of ZIF-67 derived C, N doped Co2P and Ti2VC2TxMXene for enhanced OER

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 Co 2 P derived from the metal-organic framework (ZIF-67), which is anchored on bimetallic MXene nanosheets (named MX@MOF-Co 2 P). 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-Co 2 P 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. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Automated summary

A carbon, nitrogen co-doped porous Co2P catalyst anchored on bimetallic MXene nanosheets (MX@MOF-Co2P) exhibited excellent electrocatalytic performance for the oxygen evolution reaction (OER) with small overpotentials and low Tafel slope. The exceptional performance was attributed to the porous structure, electronic structure modulation, and synergistic effect between cobalt phosphide and MXenes.