Ultra-thin NiS nanosheets as advanced electrode for high energy density supercapacitors.

Ultra-thin NiS nanosheets as advanced electrode for high energy density supercapacitors.
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超薄 NiS 纳米片作为高能量密度超级电容器的先进电极

DOI:
10.1039/c9ra09486e
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发表时间:
2020-02-27
期刊:
影响因子:
3.9
通讯作者:
--
中科院分区:
化学3区
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超级电容器的低能量密度是其实际应用的主要缺点之一。本文采用水热法在泡沫镍上合成了NiS纳米片。具有粗糙表面的NiS纳米片保证了用于能量存储的大的电活性表面积,并且在0.2 A g-1的扫描速率下显示出2587 F g-1的超高电容(对应于5563 s的放电时间)。NiS纳米片在4000次循环后也表现出95.8%的出色循环稳定性。作为混合超级电容器(HSC)的正极材料,NiS纳米结构提供了1.7 V的宽电压窗口。我们的器件在1.5 kW kg−1的功率密度下还显示出38 W h kg− 1的高能量密度。
Low energy density of supercapacitors is one of the major downsides for their practical applications. Here, a simple hydrothermal method was developed to synthesize NiS nanosheets on Ni foam. NiS nanosheets with a rough surface promise large electroactive surface area for energy storage, and show an ultra-high capacitance of 2587 F g−1 at a scan rate of 0.2 A g−1 (corresponding to the discharge time of 5563 s). The NiS nanosheets also present an outstanding cycling stability of 95.8% after 4000 cycles. As a positive electrode material for hybrid supercapacitors (HSC), NiS nanostructures provide a broad voltage window of 1.7 V. Our device also shows a high energy density of 38 W h kg−1 at a power density of 1.5 kW kg−1.
用于高性能超级电容器的介孔、分层核/壳结构ZnCo2O4/MnO2纳米锥森林
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