Non-Noble\nMetal V‑Doped Ni<sub>3</sub>S<sub>2</sub> Electrocatalyst for\nGlycerol Oxidation Synergistic Coupling\nto Promote Hydrogen Evolution Reaction

Hydrogen\nenergy represents a novel energy source characterized\nby its diverse range of origins, high energy density, and absence\nof carbon emissions. Coupled hydrogen evolution (CHE) is to achieve\nefficient, energy-saving, and economical generation of hydrogen by\nconstructing systems that promote synergistic interactions between\nmultiple reaction steps in order to reduce energy consumption and\noptimize resource utilization. This study reports the design and preparation\nof a vanadium(V)-doped Ni<sub>3</sub>S<sub>2</sub> (V-Ni<sub>3</sub>S<sub>2</sub>@NF) electrocatalyst on a nickel foam substrate. The\nelectrocatalytic material exhibits excellent electrochemical performance\nwhen catalyzing the glycerol oxidation reaction (GOR) and hydrogen\nevolution reaction (HER). Specifically, the electrode only needs to\napply a voltage equivalent to the reversible hydrogen electrode potential\n(RHE) of 1.41 and 0.56 V when driving the current intensity of GOR\nand HER to 100 mA cm<sup>–2</sup>. In addition, the 0.15 V-Ni<sub>3</sub>S<sub>2</sub>@NF electrode material exhibits excellent stability\ncharacteristics under continuous operation conditions for 10 h. In\nconclusion, 0.15 V-Ni<sub>3</sub>S<sub>2</sub>@NF was employed as\na bifunctional electrode material, and a comprehensive analysis of\nits performance in the context of GOR synergistically enhancing HER\nwas conducted. For the conversion of glycerol to formate, the Faradaic\nefficiency (FE) consistently remains at a high level of over 85%.\nSimilarly, in the hydrogen evolution reaction system, the FE of hydrogen\nproduction at the electrode consistently remains approximately 99%.\nThe findings suggest that the 0.15 V-Ni<sub>3</sub>S<sub>2</sub>@NF\nelectrode exhibits significant efficiency of energy conversion and\nselectivity during the processes of GOR and HER, and few side reactions\noccur to consume electrical energy.