Silicon carbide nanowires@Ni(OH)2 core–shell structures on carbon fabric for supercapacitor electrodes with excellent rate capability

Silicon carbide nanowires@Ni(OH)2 core–shell structures on carbon fabric for supercapacitor electrodes with excellent rate capability
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碳织物上碳化硅纳米线@Ni(OH)2核壳结构的超级电容器电极具有优异的倍率性能

DOI:
10.1016/j.jpowsour.2014.09.113
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发表时间:
2015
影响因子:
9.2
通讯作者:
Jian Sha
Jian Sha
中科院分区:
工程技术2区
文献类型:
--
作者:
Ren Lu;Wei Wang;Xinsheng Peng;Jian Sha

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采用化学气相沉积法(CVD)在柔性碳织物上生长碳化硅(SiC)纳米线,并采用电化学阴极沉积法在纳米线表面沉积Ni(OH)2。基于纯Ni(OH)2计算了制备的电极的电容性能,获得了很高的倍率容量。在2 A g−1条件下,电极的比电容达到1724 F g−1,在100 A g−1的超高充放电电流密度下,电极的比电容仍然达到1412 F g−1。优异的倍率性能意味着超级电容器电极具有优异的功率特性。当充放电倍率为100 A g−1时,电池的功率密度达到27.5 kW kg−1,能量密度仍保持在59.4 Wh kg−1。在碳纤维上制备了SiC NWs@Ni(OH)2固态超级电容器,具有良好的柔性和循环性能。
Silicon carbide (SiC) nanowires (NWs) are grown on flexible carbon fabric by chemical vapor deposition (CVD) method and Ni(OH)2are deposited on the surface of SiC NWs by electrochemical cathodic deposition. The capacitive performance of the as-prepared electrode was calculated based on pure Ni(OH)2and a very-high rate capability is achieved. A high specific capacitance of 1724 F g−1is got at 2 A g−1and the electrode still has a specific capacitance of 1412 F g−1at an ultrahigh charging/discharging current density of 100 A g−1. The excellent rate capability means great power characteristics of the supercapacitor electrode. With the charge/discharge rate of 100 A g−1, a high power density of 27.5 kW kg−1is achieved and the energy density still holds 59.4 Wh kg−1. Solid-state supercapacitor based on SiC NWs@Ni(OH)2on carbon fabric is also made and shows good flexible and cycling properties.
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