One-step Electrodeposition Prepared MoS2 Composed Ni3S2/Ni(OH)2 Nanosheets as High Efficient and Stable Metal Sulfide Catalyst for Hydrogen Precipitation in Alkaline Solutions

Hydrogen evolution reaction (HER) in alkaline media demands cost-effective and highly active electrocatalysts to replace noble metals. Herein, we report a ternary MoS₂/Ni₃S₂/Ni(OH)₂ nanoflower composite supported on nickel foam (NF) via a facile one-step electrodeposition strategy. This method enables precise control of MoS₂ morphology while mitigating aggregation-induced active site blockage. The synergistic interplay among MoS₂ (exposing edge sites), conductive Ni₃S₂, and Ni(OH)₂ (modulating electronic structure) significantly enhances HER kinetics. Notably, the optimal catalyst (5-min deposition) achieves ultralow overpotentials of 48 mV at 10 mA cm⁻² and 175 mV at 100 mA cm⁻² in 1.0 M KOH, surpassing most reported Ni- or Mo-based catalysts. Furthermore, it exhibits exceptional stability with negligible activity loss after 5000 cycles and 72-hour continuous operation. XPS analysis reveals that a high Mo⁴⁺/Mo⁶⁺ ratio facilitates electron delocalization, accelerating hydrogen intermediate desorption. This work establishes a new paradigm in HER catalyst design through interface-engineered ternary systems. By unifying electronic synergy theory with the SPRE synthesis method, we overcome the activity-stability trade-off plaguing binary catalysts. The demonstrated 500-hour stability at industrial current densities (100 mA cm⁻²) positions this approach as a transformative solution for scalable green hydrogen production. Graphical