V，Ru共掺杂NiS2 高尔夫微球作为碱性介质析氢反应的高效电催化剂

Golf-like (V, Ru)-co-doped NiS2 Microspheres as Efficient Electrocatalysts for Hydrogen Evolution Reaction in Alkaline Media

摘要:

通过溶剂热法和滴钌法（室温）将钒和钌引入到NiS₂中，并制备了包覆在泡沫镍上的V，Ru共掺杂NiS₂微球(V, Ru)-NiS₂/NF电催化剂。通过硫化过程产生粗糙的高尔夫球状结构暴露出丰富的活性位点，此外，钒和钌的协同作用可以优化NiS₂的电子结构，提供额外的催化活性位点，进一步增强本征催化活性。泡沫镍的加入对催化材料起到支撑作用，避免聚集，同时提高导电性。结果表明，(V, Ru)-NiS₂/NF电催化剂在碱性条件下表现出优异的电催化性能和优异的析氢反应稳定性。在10 mA·cm^-2的电流密度下，(V, Ru)-NiS₂/NF提供了38 mV的过电位，小于商业Pt/C的过电位，并且具有较低的Tafel斜率（80.3 mV·dec^-1）、较高的电化学活性表面（ECSA）和在KOH溶液中24 h出色的稳定性。

Abstract:

Vanadium and ruthenium were introduced into NiS₂ via solvothermal method and ruthenium drop method (room temperature) to prepare (V, Ru)-co-doped NiS₂ microspheres coated on Ni foam ((V, Ru)-NiS₂/NF) as electrocatalysts. The rough golf-like structure allowed the exposure of abundant active sites via sulfuration process. Moreover, the cooperation of vanadium and ruthenium could optimize the electronic structure of NiS₂, provide extra catalytically active sites, and further strengthen the intrinsic catalytic activity. Besides, the addition of nickel foam could support the catalytic material, avoid the aggregation, and enhance the conductivity. Results show that the obtained (V, Ru)-NiS₂/NF electrocatalysts exhibit excellent electrocatalytic performance and superior stability for hydrogen evolution reaction (HER) in alkaline media. At the current density of 10 mA·cm^-2, the presented (V, Ru)-NiS₂/NF delivers an overpotential of 38 mV, which is smaller than that of commercial Pt/C, and possesses lower Tafel slope (80.3 mV·dec^-1), higher relative electrochemical active surface area (ECSA) and excellent durability in 1 mol/L KOH for 24 h.