Abstract In the present work, Mesoporous Rhombohedral β-NiS (Nickel Sulphide) was synthesized by a solvothermal route using thiourea as Sulphur source. Rietveld refinement confirms the single phase formation of Rhombohedral β-NiS. Reaction temperature affects the electro-catalytic, optical and morphology of the synthesized β-NiS nanoparticles. 1-D nano-rods and cluster beans like structures are observed in FESEM images. At lower temperature, energy band gap of the synthesized β-NiS nanoparticles is found to be 2.75 eV. Carbonaceous free electrodes were used for electrocatalytic studies in 1 M aqueous LiOH electrolyte. Electrocatalytic activity of β-NiS nanoparticles were studied by cyclic voltammetry technique and electrochemical impedance spectroscopy. During the analysis of cyclic voltammetry technique it was found that the synthesized β-NiS electrode showed maximum areal capacitance 12.02 F cm−2 with 83% cyclic stability over 1000 cyclic voltammetry cycles.

中文翻译：

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溶剂热合成介孔菱面体硫化镍的电催化活性增强

摘要 在目前的工作中，以硫脲为硫源，通过溶剂热法合成了介孔菱面体 β-NiS（硫化镍）。Rietveld 精修证实了菱形 β-NiS 的单相形成。反应温度影响合成的 β-NiS 纳米粒子的电催化、光学和形态。在 FESEM 图像中观察到一维纳米棒和簇豆状结构。在较低温度下，合成的 β-NiS 纳米颗粒的能带隙为 2.75 eV。无碳电极用于在 1 M LiOH 电解质中进行电催化研究。采用循环伏安法和电化学阻抗谱研究了β-NiS纳米颗粒的电催化活性。