Vulcanizing time controlled synthesis of NiS microflowers and its application in asymmetric supercapacitors
Vulcanizing time controlled synthesis of NiS microflowers and its application in asymmetric supercapacitors
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NiS微花的硫化时间控制合成及其在不对称超级电容器中的应用
DOI:
10.1016/j.electacta.2017.02.032
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发表时间:
2017-03
影响因子:
6.6
通讯作者:
Zhang Huaihao
中科院分区:
文献类型:
--
作者:
Zhao Jing;Guan Bing;Hu Bin;Xu Zongying;Wang Dawei;Zhang Huaihao
Hierarchical NiS was synthesized under different vulcanizing time via a facial sacrificial template method with Ni(OH)2microflowers as precursors. The as-prepared samples were characterized by XRD, BET, XPS, SEM and TEM. The results show that the NiS microstructure changes from microflower to microspheres gradually with the increase of vulcanizing time. Impressively, with the reaction time extending to 18 h, the NiS-18 microflowers have the largest surface areas (20.5 m2·g−1) and the roughest surface. Electrochemical measurements showed that NiS-18 possessed the highest specific capacitance (1315.4 F·g−1at current density of 1 A·g−1) and excellent cycling stability (89.2% of theCmretained after 5000 GCD cycles at current density of 10 A·g−1). More importantly, an asymmetric supercapacitor (SC), consisting of NiS-18 as positive electrode and active carbon (AC) as negative electrode (NiS//AC), achieves a high potential window of 1.6 V. The NiS//AC displays a high energy density of 33.4 Wh·kg−1at power density of 0.8 kW·kg−1. Additionally, NiS//AC SC exhibits excellent cycling performance (87.3%Cmretained after 5000 GCD cycles at current density of 5 A·g−1) and nearly 100% Coulombic efficiency.
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