期刊
ELECTROCHIMICA ACTA
卷 123, 期 -, 页码 158-166出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.12.187
关键词
Nickel hydroxide; Hydrothermal synthesis; Nanoflower; Supercapacitor; Asymmetric supercapacitor
资金
- Natural Science Foundation of Hebei Province [B2013203199, B2012203043]
- China Postdoctoral Science Foundation [2012M520597]
- Key Technology Research and Development Program of Qinhuangdao [2012021A072]
- State Key Laboratory of Advanced Technology for Material Synthesis and Processing (Wuhan University of Technology) [2013-KF-11]
To construct suitable nanostructures for electronic and ionic transport in the electrode of a supercapacitor, a flower-like nanostructured nickel hydroxide (Ni(OH)(2)) was synthesized by a facile hydrothermal process in this study. For comparison, an additional two Ni(OH)(2) samples were synthesized to investigate the formation mechanism of the flower-like Ni(OH)(2). Physicochemical characterizations indicate that the Ni(OH)(2) nanoflower was formed by stacked hexagonal 3-phase of the Ni(OH)(2) nanoflakes. The dissolution-recrystallization of Ni(OH)(2) and the stacking of nanoflakes play important roles in the formation of Ni(OH)(2) nanoflowers. Due to the higher conductivity and the suitable macropores for ionic transport, the nanoflower-like Ni(OH)(2) exhibits a high specific capacitance of 2653.2 F g(-1) at 2 A g(-1) and 1998.5 F g(-1) at 40 A g(-1). An asymmetric supercapacitor, which was assembled with Ni(OH)(2) as the positive material and HNO3-treated activated carbon as the negative material, exhibited a high cell voltage of 1.6 V. Due to the high specific capacitance and high cell voltage, the as-prepared asymmetric supercapacitor exhibited a high energy density of 32.7 Wh kg(-1) at 71.5 W kg(-1) and 25.5 Wh kg(-1) at 1.28 kW kg(-1). (C) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据