In the present work, two different phases of nickel sulphide (β-NiS and NiS₂) were successfully synthesized via facile hydrothermal route. The physical and chemical characterizations such as X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy confirms formation of β-NiS and NiS₂. Mesoporous caterpillar and cabbage-like nanostructures were observed in FESEM image with enlarged specific area 247.22 m²/g and 251.47 m²/g, respectively. Due to large surface area of the synthesized β-NiS and NiS₂ nanoparticles, bandgap was found to be reduced as 0.98 eV and 0.74 eV, respectively, than the bulk NiS. Charge transfer characteristics were examined by electrochemical impedance spectroscopy (EIS) technique; caterpillar-like nanostructures (β-NiS) has lowest charge transfer resistance 2.91 Ω, due to its unique structure. Cyclic Voltammetry (CV) analysis reveals that the synthesized β-NiS and NiS₂ nanoparticles show that the charge storage mechanism is non-Faradaic. Cabbage-like β-NiS nanoparticles show maximum areal capacitance 14.24 F cm⁻² in 1 M LiOH electrolyte and show 89% cyclic stability over 1000 cycles. The electrocatalytic performance, such as high areal capacitance and lower charge transfer resistance indicate that the synthesized β-NiS and NiS₂ nanoparticles facilitate fast ion diffusion during redox processes.

在目前的工作中，通过简便的水热法成功地合成了两个不同的硫化镍相（β-NiS和NiS ₂）。诸如X射线光电子能谱（XPS），X射线衍射（XRD）和傅里叶变换红外（FTIR）光谱等物理和化学特征证实了β-NiS和NiS _2的形成。在FESEM图像中观察到介孔的毛毛虫状和卷心菜状的纳米结构，其比表面积分别增加了247.22 m ² / g和251.47 m ² / g。由于合成的β-NiS和NiS _2的表面积大在纳米粒子中，带隙被发现比整体NiS分别降低了0.98 eV和0.74 eV。通过电化学阻抗谱（EIS）技术检查电荷转移特性；毛毛虫状纳米结构（β-NiS）由于其独特的结构而具有最低的电荷转移电阻2.91Ω。循环伏安法（CV）分析表明，合成的β-NiS和NiS ₂纳米粒子表明电荷存储机制是非法拉第的。卷心菜状的β-NiS纳米颗粒在1 M LiOH电解质中显示的最大面电容为14.24 F cm ^-2，在1000次循环中显示89％的循环稳定性。高面积电容和较低的电荷转移电阻等电催化性能表明合成的β-NiS和NiS ₂ 纳米粒子有助于氧化还原过程中离子的快速扩散。