Synthesis of honeycomb-like NiS2/NiO nano-multiple materials for high performance supercapacitors

Synthesis of honeycomb-like NiS2/NiO nano-multiple materials for high performance supercapacitors
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高性能超级电容器蜂窝状NiS2/NiO纳米多元材料的合成

DOI:
10.1016/j.electacta.2015.05.070
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发表时间:
2015-08
影响因子:
6.6
通讯作者:
Li Qiang
Li Qiang
中科院分区:
材料科学2区
文献类型:
--
作者:
Zhang Dongming;Zhou Xiaobin;Ye Ke;Li Yiju;Song Congying;Cheng Kun;Cao Dianxue;Wang Guiling;Li Qiang

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采用简单的水热法在泡沫镍表面制备了多孔的NiS 2纳米片,成功地制备了三维蜂窝状NiS 2/NiO纳米复合材料。采用扫描电子显微镜、X射线能谱仪、透射电子显微镜、X射线衍射仪等对NiS 2/NiO的形貌和相结构进行了表征,并采用循环伏安法、恒流充放电和电化学阻抗谱等测试手段对NiS 2/NiO的电化学性能进行了测试。NiS 2/NiO电极与裸NiO基板相比具有更低的电化学阻抗,并表现出优异的电容性能,在1 A g-1的电流密度下提供2251 F g-1的高比电容,而在20 A g-1下保持1192 F g-1。更重要的是,在2000次循环后,比电容保持在1275 F g−1(5 A g−1),电容保持率为78%。因此,NiS 2/NiO电极表现出了优异的电化学性能,在电化学超级电容器中具有良好的应用前景。
Three dimensional (3D) honeycomb-like NiS2/NiO nano-multiple materials were successfully prepared by fabricating cribrate NiS2on the surface of NiO nanosheets through simple hydrothermal process on nickel foam. The morphology and phase structure of the NiS2/NiO are characterized by scanning electron microscopy equipped with energy dispersive X-ray spectrometer, transmission electron microscope, X-ray diffractometer and the electrochemical properties are tested by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. The NiS2/NiO electrode owns lower electrochemical impedance compared with bare NiO substrate and exhibits exceptional capacitance performance with a high specific capacitance of 2251 F g−1delivered at current density of 1 A g−1, while 1192 F g−1retained at 20 A g−1. What's more, after 2000 cycles, the specific capacitance remains 1275 F g−1(at 5 A g−1) with a capacitance retention of 78%. Therefore, the NiS2/NiO electrode shows remarkable electrochemical performance and has a promising future for electrochemical supercapacitors.
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