Abstract
Asymmetric supercapacitors (ASCs) are successfully developed with configuration of negative electrode using hierarchical MoO3–PPy core–shell nanobelts (MoO3–PPy) and positive electrode with “worm-like” MWNTs–MnO2 core–shell materials (CNTs–MnO2) in Na2SO4 aqueous electrolyte. The MoO3 nanobelts are prepared by a facile hydrothermal method and get significant improvement in specific capacitance with modification of PPy layer from 124 to 285 F/g. Furthermore, the optimized ASCs based on the MoO3–PPy//CNTs–MnO2 can achieve 1.8 V high voltage even in Na2SO4 aqueous solution and possess a high energy density of 21.03 Wh/kg at the power density of 0.22 kW/kg. Additionally, the ASCs exhibit excellent cycle stability, with 76% retention of its original value even after 10000 cycles. The ASCs are further demonstrated to light up a red light-emitting diode in series. These encouraging results indicate a promising application in the energy-storage devices with high power density and energy density.
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Acknowledgements
This project was granted financial support by the Natural Science Foundation of Gansu Province (Grant No. 1606RJYA249) and the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2017-99).
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Du, P., Wei, W., Liu, D. et al. Fabrication of hierarchical MoO3–PPy core–shell nanobelts and “worm-like” MWNTs–MnO2 core–shell materials for high-performance asymmetric supercapacitor. J Mater Sci 53, 5255–5269 (2018). https://doi.org/10.1007/s10853-017-1927-3
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DOI: https://doi.org/10.1007/s10853-017-1927-3