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Enhanced energy density of asymmetric supercapacitors via optimizing negative electrode material and mass ratio of negative/positive electrodes

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Abstract

An asymmetric supercapacitor based on manganese dioxide/Au/nickel foam (MANF) electrode as positive electrode and graphene or commercial activated carbons (AC) as negative electrode was fabricated. The effect of different negative electrode materials and mass ratios of negative/positive electrodes on the electrochemical properties of the asymmetric supercapacitor was carefully investigated. The results suggest that the mass ratio of negative/positive electrode has a significant impact on the specific capacitance of the asymmetric supercapacitor. Especially, it is found that the optimal mass ratio of the negative/positive electrode is slightly lower than that calculated according to charge balance. On the other hand, the asymmetric supercapacitor with commercialized AC as negative electrode possesses higher specific capacitance and better rate capability than that of the asymmetric supercapacitor with graphene as negative electrode. The negative material has slight impact on the cycle stability of the asymmetric supercapacitor. In addition, the optimized asymmetric supercapacitor with MANF composite as positive electrode and AC as negative electrode can obtain an energy density as high as 65.9 Wh kg−1 at a power density of 180 W kg−1 and a cell voltage of 1.8 V in the neutral Na2SO4 aqueous solution.

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Acknowledgments

This work was supported by grants from the Natural Science Foundation of China (NSFC no. 20903050), the Fundamental Research Funds for the Central University (Lzujbky-2012-22 and Lzujbky-2012-79), and the Science and Technology Program of Gansu Province of China (1107RJYA004).

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Authors and Affiliations

  1. Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, People’s Republic of China

    Pengyi Tang, Yongqing Zhao, Cailing Xu & Kunpeng Ni

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  1. Pengyi Tang
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  2. Yongqing Zhao
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  3. Cailing Xu
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  4. Kunpeng Ni
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Correspondence to Yongqing Zhao or Cailing Xu.

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Tang, P., Zhao, Y., Xu, C. et al. Enhanced energy density of asymmetric supercapacitors via optimizing negative electrode material and mass ratio of negative/positive electrodes. J Solid State Electrochem 17, 1701–1710 (2013). https://doi.org/10.1007/s10008-013-2021-7

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  • DOI: https://doi.org/10.1007/s10008-013-2021-7

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