Engineering Ultrathin MoS 2 Nanosheets on Co x P/Nitrogen‐Doped Carbon Nanocubes for Efficient Hydrogen Evolution

Designing core‐shell heterostructures is essential for electrocatalytic hydrogen evolution reaction (HER). In this study, ultrathin MoS 2 sheets are uniformly anchored on Co x P/nitrogen dual‐doped carbon nanocubes (Co x P/NC) through a template sacrificial method followed by a hydrothermal reaction. The resultant hybrid Co x P/NC@MoS 2 possesses a core‐shell structure and superior catalytic activity to individual counterparts. The hybrid catalyst needs a low overpotential of 148 mV to drive the current density of 10 mA cm −2 , together with an extremely small Tafel slope of 33 mV dec −1 and outstanding stability in acidic media. Most importantly, the best catalytic activity is achieved by coupling MoS 2 nanosheets with the matrix Co x P/NC rather than Co/NC. The remarkably high HER activity of Co x P/NC@MoS 2 mainly benefits from the core‐shell feature and strong synergistic interaction between Co x P/NC and MoS 2 . The present study inspires a continuous exploration of engineering MoS 2 nanosheets on nanostructured metal phosphides for electrochemical applications.