The rational design and construction of efficient electrocatalysts play a leading role for water splitting, but very rarely Pt-like activity has been obtained by these non-noble metal catalysts. It is obvious that the cooperative coupling of non-noble metal catalysts could be regarded as a preferred alternative to Pt-based materials in hydrogen evolution reaction (HER). Herein, a heterostructure electrocatalyst on Ni foam with CoP nanowires coupled with the defective CoMoP nanosheets (CoP/CoMoP) is first synthesized via hydrothermal method followed by low-temperature phosphidation. Results indicate that CoP/CoMoP shows extraordinarily efficient HER activity and robust stability, especially, high activity superior to that of commercial Pt/C in alkaline electrolyte, due to the cooperative effect of interfaces between CoP and CoMoP. Density functional theory (DFT) calculations certified that the interface between the CoP and CoMoP can improve the activity of HER, especially in alkaline condition, by facilitating the H₂O-dissociation on the CoMoP and H-adsorption on the CoP. Moreover, the CoMoP with P defects can enhance the activity of HER by preventing the active sites of CoMoP and CoP from the blocking of OH*. It is expected that such heterostructure CoP/CoMoP could provide a powerful interface-engineering strategy to design and construct efficient cooperative electrocatalysts for HER.

高效电催化剂的合理设计和结构在水分解中起着主导作用，但是这些非贵金属催化剂很少获得类似Pt的活性。显然，在氢气析出反应（HER）中，非贵金属催化剂的协同偶联可被视为基于Pt的材料的优选替代方案。在此，对Ni泡沫配上缺陷CoMoP纳米片（COP / CoMoP）扶贫纳米线异质结构电首先合成通过水热法，然后进行低温磷酸化。结果表明，由于CoP和CoMoP之间的界面协同作用，CoP / CoMoP表现出非常有效的HER活性和强大的稳定性，尤其是在碱性电解质中具有优于商用Pt / C的高活性。密度泛函理论（DFT）计算证明，CoP和CoMoP之间的界面可以通过促进H ₂来改善HER的活性，特别是在碱性条件下CoMoP上的O-解离和CoP上的H-吸附。此外，具有P缺陷的CoMoP可以通过阻止CoMoP和CoP的活性位点阻止OH *来增强HER的活性。预期这种异质结构的CoP / CoMoP可以为设计和构建用于HER的高效协同电催化剂提供强大的界面工程策略。