Facile fabrication of flower-like CuCo2S4 on Ni foam for supercapacitor application

作者：Zhang, Yan; Xu, Jie^*; Zhang, Yingjiu; Zheng, Yayun; Hu, Xing; Liu, Zhongxia

来源：Journal of Materials Science, 2017, 52(16): 9531-9538.

DOI：10.1007/s10853-017-1119-1

• HIGH-PERFORMANCE SUPERCAPACITORS
• ELECTROCHEMICAL ENERGY-STORAGE
• BINDER-FREE ELECTRODES
• HIGH-RATE CAPABILITY
• ASYMMETRIC SUPERCAPACITORS
• NANOSHEET ARRAYS
• NICKEL FOAM
• NANOWIRE ARRAYS
• CONSTRUCTION
• CARBON

Electrochemical performance and production cost are the main concerns of electrode materials for the practical supercapacitor applications. Here we use a simple and universally applicable two-step hydrothermal treatment process to prepare the flower-like CuCo2S4 nanosheet arrays directly grown on Ni foam and employ it as binder-free and conductive-agent-free electrode for pseudocapacitors. The electrode at a current density of 5 mA cm(-2) exhibits an ultrahigh capacitance of 908.9 F g(-1) and at 30 mA cm(-2) delivers an outstanding cycling stability with retaining 91.1% after 2000 cycles compared with its initial capacity. Furthermore, the assembled flower-like nanostructured CuCo2S4//active carbon asymmetric supercapacitor displays a specific capacitance of 93.5 F g(-1) at 1 mA cm(-2), an energy density of 29.2 Wh kg(-1) at 127 W kg(-1), as well as 126.39% capacitance retention through 2000 cycles at the high current density of 25 mA cm(-2), suggesting the flower-like CuCo2S4 nanosheet arrays hold promise for practical application of high-performance supercapacitors.

• 出版日期2017-8
• 单位郑州大学