School of Electrical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Republic of Korea.
Dalton Trans. 2019 Jan 2;48(2):578-586. doi: 10.1039/c8dt04139c.
In the present study, a NiS@ZnS composite nanostructure was synthesized on a nickel foam substrate by a facile chemical bath deposition (CBD) method. The prepared composites were analyzed by X-ray photoelectron spectroscopy, high resolution transmission electron microscopy, and field emission scanning electron microscopy. The electrochemical performance of the supercapacitor (SC) electrodes was examined by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The NiS@ZnS composite exhibited a cabbage leaf like nanostructure and showed outstanding electrochemical performance in SCs with a specific capacitance of 1533.0 F g-1 at a current density of 7.5 A g-1, good cycling stability with 97.9% retention over 3000 cycles, greater energy density, and excellent rate capability compared to the bare NiS (1279.83 F g-1) and ZnS (616.66 F g-1)-based electrodes in SCs. The facile, novel synthesis method, outstanding performance, well defined surface morphology, synergetic effect and low cost make the NiS@ZnS composite an ideal electrode material for electrochemical energy storage devices.
在本研究中，通过简便的化学浴沉积（CBD）方法在镍泡沫基底上合成了 NiS@ZnS 复合纳米结构。通过 X 射线光电子能谱、高分辨率透射电子显微镜和场发射扫描电子显微镜对制备的复合材料进行了分析。通过循环伏安法、恒电流充放电和电化学阻抗谱研究了超级电容器（SC）电极的电化学性能。NiS@ZnS 复合材料呈现出类似卷心菜叶的纳米结构，在 SC 中表现出出色的电化学性能，在 7.5 A g-1 的电流密度下具有 1533.0 F g-1 的比电容，在 3000 次循环后保持 97.9%的优异循环稳定性，与裸 NiS（1279.83 F g-1）和 ZnS（616.66 F g-1）基电极相比，具有更高的能量密度和优异的倍率性能。在电化学储能器件中，NiS@ZnS 复合材料具有简便、新颖的合成方法、优异的性能、明确的表面形态、协同效应和低成本等优点，是一种理想的电极材料。
