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

作者：Wu, Dong; Xiao, Ting^*; Tan, Xinyu^*; Xiang, Peng; Jiang, Lihua; Kang, Zhe; Tan, Pin

来源：Electrochimica Acta, 2016, 198: 1-9.

DOI：10.1016/j.electacta.2016.01.194

• cobalt chloride carbonate hydroxide
• nanowire arrays
• asymmetric supercapacitors

Cobalt chloride carbonate hydroxide nanowire arrays (CCCH NWAs) with an average length of similar to 8 mm 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/cm(2), and an good cycling stability demonstrated by a 87.3% capacitance retention after 2000 cycles at a current of 7.5 mA/cm(2). 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.

• 出版日期2016-4-20
• 单位三峡大学