Abstract
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.
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The present work is financially supported by the Natural Science Foundation under the Grants of NSFC (51602289), the Startup Research Fund of Zhengzhou University (51090104).
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Zhang, Y., Xu, J., Zhang, Y. et al. Facile fabrication of flower-like CuCo2S4 on Ni foam for supercapacitor application. J Mater Sci 52, 9531–9538 (2017). https://doi.org/10.1007/s10853-017-1119-1
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DOI: https://doi.org/10.1007/s10853-017-1119-1