High-performance Co4S3-MnS-MoS2@CC catalysts for the hydrogen evolution reaction†

By leveraging the self-assembly properties of polyoxometalates (POMs), we synthesized a trimetallic-integrated POM compound, [Co(NH₃)₆]₂(MnMo₉O₃₂) (Co₂MnMo₉), and subsequently fabricated a composite catalytic material, Co₄S₃-MnS-MoS₂@CC, anchored on carbon cloth through a hydrothermal-calcination strategy. Experimental results demonstrate that the incorporation of trace amounts of Co₄S₃ and MnS substantially enhances the electrocatalytic performance of the hybrid material. At a current density of 10 mA cm⁻², the overpotential of the composite is reduced to 88 mV in alkaline media and 140 mV in acidic media, markedly superior to pristine MoS₂ (197 mV in alkaline and 237 mV in acidic conditions). Through comprehensive characterization techniques and electrochemical analyses, we elucidated the synergistic enhancement mechanism arising from multi-metallic doping. This work provides novel insights and technical benchmarks for the development of cost-effective, high-efficiency electrocatalysts.