High-performance asymmetric supercapacitors based on cobalt chloride carbonate hydroxide nanowire arrays and activated carbon

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• 作者：Dong Wu^a ; ^b ; ^d ; Ting Xiao^a ; ^d ; ^{tingxiao@ctgu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xinyu Tan^a ; ^d ; ^{husttanxin@mail.tsinghua.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Peng Xiang^a ; Lihua Jiang^a ; Zhe Kang^c ; ^d ; Pin Tan^c ; ^d
• 关键词：cobalt chloride carbonate hydroxide ; nanowire arrays ; asymmetric supercapacitors
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 April 2016
• 年：2016
• 卷：198
• 期：Complete
• 页码：1-9
• 全文大小：3179 K

文摘

Cobalt chloride carbonate hydroxide nanowire arrays (CCCH NWAs) with an average length of ∼8 μm grown on Ni foam was successfully fabricated via a simple hydrothermal process. Electrochemical tests show a specific capacitance as high as 1737 F/g at 2.5 mA/cm², and an good cycling stability demonstrated by a 87.3% capacitance retention after 2000 cycles at a current of 7.5 mA/cm². An asymmetric supercapacitor was also successfully assembled with CCCH NWAs and activated carbon (AC) applied as positive and negative electrode, respectively. The asymmetric supercapacitor exhibited a maximum energy density of 29.1 Wh/kg at power density of 100 W/kg in the wide voltage region of 0–1.6 V, as well as a good electrochemical stability. The impressive results presented here may pave the way for promising applications in cheap, easy preparation and high energy density storage systems.