Hybrid Zeolitic Imidazolate Framework‐Derived Co₃Mo/Mo₂C Heterostructure for Enhanced Oxygen Evolution Reaction

Abstract Constructing heterostructures is an efficient strategy to develop high‐performance and robust electrocatalysts for oxygen evolution reaction (OER). Herein, an ion‐impregnation method and an environmentally friendly in situ carbonization strategy are successively employed to fabricate a novel Co₃Mo/Mo₂C heterostructure anchored on nitrogen‐doped carbon (Co₃Mo/Mo₂C@NC). Thanks to the formation of heterostructure, the obtained Co₃Mo/Mo₂C@NC exhibits an enhanced catalytic performance toward OER with a low overpotential (282 mV @ 10 mA cm⁻², 322 mV @ 50 mA cm⁻², and 355 mV @100 mA cm⁻²) and robust stability (100 mA cm⁻² for 200 h) in alkaline media. Detailed experimental results combined with theoretical calculations reveal the formation of a Co₃Mo/Mo₂C heterojunction interface can decrease the energy barrier of the rate‐determining step for intermediates during the OER process, thereby inherently enhancing the OER performance. This work presents a rational synthetic route for designing high‐performance heterostructures for energy conversion technologies.