Efficient, inexpensive and stable electrocatalysts are challenging and desperately required in order to complement the water electrolysis of noble metal catalysts. Herein, a porous nitrogen-doped carbon wrapped Co-Mo₂C dual Mott–Schottky heterostructure has been successfully fabricated by carbonization of Co-Zn bimetal metal-organic framework (MOF) for water electrolysis. The heterostructure is found to feature with Co and Mo₂C nanoparticles uniformly encapsulated in the highly porous leaf-like N-doped carbon nanosheet matrix. Such a thin porous dual-Mott–Schottky configuration can afford abundant surface active sites and the boosted electron transfer to promote the water splitting. As for hydrogen/oxygen evolution reaction (HER/OER), it has demonstrated fast kinetics and low overpotentials of 92 mV (HER) and 338 mV (OER) at a current density of 10 mA cm⁻² in 1 M KOH. Furthermore, the overall water splitting is stably delivered with a low cell voltage of 1.68 V at 10 mA cm^-2 in 1 M KOH. Density function theory (DFT) calculations demonstrate that the interface correlation is favorable to water transfer by electron and speeds up adsorption and water dissociation. The work here opens up interesting possibilities for the rational design and innovation of MOF derived Mott–Schottky electrocatalysts for highly efficient water electrolysis.

为了补充贵金属催化剂的水电解，高效，廉价和稳定的电催化剂是挑战性的并且迫切需要的。在此，通过碳化Co-Zn双金属金属有机骨架（MOF）进行水电解，成功地制备了多孔的氮掺杂碳包裹的Co-Mo ₂ C双Mott-Schottky异质结构。发现异质结构具有Co和Mo _2的特征C纳米颗粒均匀地封装在高度多孔的叶状N掺杂碳纳米片基质中。如此薄的多孔双莫特-肖特基构型可提供丰富的表面活性位点，并增强电子转移，从而促进水分解。至于氢/氧放出反应（HER / OER），在1 M KOH中的电流密度为10 mA cm ^{-2的情况下}，它已显示出92 mV（HER）和338 mV（OER）的快速动力学和低过电势。此外，在10 mA cm ^{-2的情况下}，以1.68 V的低电池电压稳定地输送了整个水分解液在1 M KOH中。密度泛函理论（DFT）计算表明，界面相关性有利于电子通过水进行转移，并加速了吸附和水的离解。此处的工作为合理设计和创新MOF衍生的Mott-Schottky电催化剂以实现高效水电解开辟了有趣的可能性。