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Vertically oriented Ni3S2/RGO/Ni3S2 nanosheets on Ni foam for superior supercapacitors

机译:镍泡沫上的垂直取向Ni3S2 / RGO / Ni3S2纳米片,可用于超级电容器

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摘要

A unique sandwich structure of Ni3S2/RGO/Ni3S2 consisting of Ni3S2 nanosheets was designed and constructed on nickel foam (NF) by a one-step hydrothermal process. The lower Ni3S2 layer was converted in situ from the Ni foam substrate, while the upper Ni3S2 layer with vertical nanosheets resulted from Ni2+ ions in the solution. This Ni3S2/RGO/Ni3S2/NF nanocomposite was directly utilized as a supercapacitor electrode, which possessed a high areal mass loading of 5.2 mg cm(-2), and superior performance: a specific capacitance of up to 16.82 F cm(-2) (i.e., 3234.62 F g(-1)) at a current density of 20 mA cm(-2) (3.85 A g(-1)) and 90% retention of the initial capacitance after 1000 cycles at the high rate of 100 mA cm(-2) (19.23 A g(-1)).
机译:通过一步水热法,在泡沫镍(NF)上设计并构建了由Ni3S2纳米片组成的Ni3S2 / RGO / Ni3S2独特的三明治结构。下部Ni3S2层从Ni泡沫基材上原位转化,而具有垂直纳米片的上部Ni3S2层由溶液中的Ni2 +离子产生。该Ni3S2 / RGO / Ni3S2 / NF纳米复合材料直接用作超级电容器电极,具有5.2 mg cm(-2)的高单位面积质量负载和卓越的性能:比电容高达16.82 F cm(-2) (即3234.62 F g(-1))在20 mA cm(-2)(3.85 A g(-1))的电流密度下,在以100 mA的高速率进行1000次循环后初始电容保持90% cm(-2)(19.23 A g(-1))。

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