Few-layered Ni(OH)2 nanosheets for high-performance supercapacitors

Few-layered Ni(OH)2 nanosheets for high-performance supercapacitors
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DOI:
10.1016/j.jpowsour.2015.07.024
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发表时间:
2015-11-01
影响因子:
9.2
通讯作者:
Yan, Qingyu
Yan, Qingyu
中科院分区:
工程技术2区
文献类型:
--
作者:
Sun, Wenping;Rui, Xianhong;Yan, Qingyu

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合成了少层Ni(OH)(2)纳米片(厚度为4-5 nm),用于高性能超级电容器。在三电极和非对称电极中,Ni(OH)(2)纳米片均表现出较高的比电容和良好的倍率性能。在三电极器件中,Ni(OH)(2)纳米片在2 A g(-1)下提供2064 F g(-1)的高电容,并且在20 A g(-1)的高电流密度下电容仍然具有1837 F g(-1)的保持率。这种优异的性能是迄今为止Ni(OH)2电极的最佳性能之一。在双电极非对称器件中,在1Ag(-1)时的比电容为248 Fg(-1),在20 Ag(-1)时达到113 Fg(-1)。在2A g(-1)的循环电压下,该非对称器件的电容在第4000次循环中保持在166 F g(-1),表明该器件具有良好的循环稳定性。此外,非对称装置在0.8kW kg(-1)的功率密度下表现出22 Wh kg(-1)的重量能量密度。目前的结果表明,超薄Ni(OH)(2)纳米片是实现快速充电/放电和大容量超级电容器的非常有吸引力的电极材料。(C)2015 Elsevier B. V.版权所有。
Few-layered Ni(OH)(2) nanosheets (4-5 nm in thickness) are synthesized towards high-performance supercapacitors. The ultrathin Ni(OH)(2) nanosheets show high specific capacitance and good rate capability in both three-electrode and asymmetric devices. In the three-electrode device, the Ni(OH)(2) nanosheets deliver a high capacitance of 2064 F g(-1) at 2 A g(-1), and the capacitance still has a retention of 1837 F g(-1) at a high current density of 20 A g(-1). Such excellent performance is by far one of the best for Ni(OH)2 electrodes. In the two-electrode asymmetric device, the specific capacitance is 248 F g(-1) at I A g(-1), and reaches 113 F g(-1) at 20 A g(-1). The capacitance of the asymmetric device maintains to be 166 F g(-1) during the 4000th cycle at 2 A g(-1), suggesting good cycling stability of the device. Besides, the asymmetric device exhibits gravimetric energy density of 22 Wh kg(-1) at a power density of 0.8 kW kg(-1). The present results demonstrate that the ultrathin Ni(OH)(2) nanosheets are highly attractive electrode materials for achieving fast charging/discharging and high-capacity supercapacitors. (C) 2015 Elsevier B.V. All rights reserved.