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Structural and electrochemical performances of α-MnO2 doped with tin for supercapacitors

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Abstract

To improve the electrochemical performances of α-MnO2 as electrode materials for supercapacitors, Sn-doped α-MnO2 in the presence of the doping amount of 1%-4% was successfully synthesized by hydrothermal method. As-prepared α-MnO2 presents nanorod shape and no other impurities exist. By ultraviolet-visible absorption spectroscopy, it is convinced that the band gaps of α-MnO2 decrease with increasing Sn-doping amount. Cyclic voltammetry investigation indicates that undoped and doped α-MnO2 all have regular capacitive response. As the scan rate enlarged, the profiles of curves gradually deviate from rectangle. Compared with undoped α-MnO2, doped α-MnO2 has larger specific capacitance. The specific capacitance of 3% doped α-MnO2 reaches 241.0 F/g while undoped α-MnO2 only has 173.0 F/g under 50 mA/ g current density in galvanostatical charge-discharge measurement. Enhanced conductivity by Sn-doping is considered to account for doped sample’s enhanced electrochemical specific capacitance.

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Authors and Affiliations

  1. School of Environmental and Materials Engineering, College of Engineering, Shanghai Polytechnic University, Shanghai, 201209, China

    Yang Li  (黎阳), Jing Li, Huaqing Xie, Fan Yang & Yuhong Zhou

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  1. Yang Li  (黎阳)
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  2. Jing Li
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  3. Huaqing Xie
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  4. Fan Yang
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  5. Yuhong Zhou
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Correspondence to Yang Li  (黎阳).

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Funded by The National Natural Science Foundation of China (51402185) and the Natural Science Foundation of Shanghai (13ZR1454700)

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Li, Y., Li, J., Xie, H. et al. Structural and electrochemical performances of α-MnO2 doped with tin for supercapacitors. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 32, 237–244 (2017). https://doi.org/10.1007/s11595-017-1586-x

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  • DOI: https://doi.org/10.1007/s11595-017-1586-x

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