Interface engineering is a method of enhancing catalytic activity while maintaining a material's surface properties. Thus, we explored the interface effect mechanism a hierarchical structure of MoP/CoP/CuP/CF. Remarkably, the heterostructure MoP/CoP/CuP/CF demonstrates an outstanding overpotential of 64.6 mV at 10 mA cm with a Tafel slope of 68.2 mV dec in 1 M KOH. DFT calculations indicate that the MoP/CoP interface in the catalyst exhibited the most favorable H* adsorption characteristics (-0.08 eV) compared to the pure phases of CoP (0.55 eV) and MoP (0.22 eV). This result can be attributed to the apparent modulation of electronic structures within the interface domains. Additionally, the CoCH/Cu(OH)/CF‖MoP/CoP/CuP/CF electrolyzer demonstrates excellent overall water splitting performance, achieving 10 mA cm in 1 M KOH solution with a modest voltage of only 1.53 V. This electronic structure adjustment interface effects provides a new and efficient approach to prepare high-performance hydrogen production catalysts.
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