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Tangming Mo, Liang Zeng, Zhenxiang Wang, Svyatoslav Kondrat, Guang Feng. Symmetrizing cathode-anode response to speed up charging of nanoporous supercapacitors. Green Energy&Environment, 2022, 7(1): 95-104. doi: 10.1016/j.gee.2021.05.001
Citation: Tangming Mo, Liang Zeng, Zhenxiang Wang, Svyatoslav Kondrat, Guang Feng. Symmetrizing cathode-anode response to speed up charging of nanoporous supercapacitors. Green Energy&Environment, 2022, 7(1): 95-104. doi: 10.1016/j.gee.2021.05.001
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Symmetrizing cathode-anode response to speed up charging of nanoporous supercapacitors

doi: 10.1016/j.gee.2021.05.001

  • a State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology (HUST), Wuhan, 430074, China;

  • b Nano Interface Centre for Energy, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074, China;

  • c Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw, 01-224, Poland;

  • d Max-Planck-Institut Für Intelligente Systeme, Stuttgart, D-70569, Germany;

  • e IV. Institut Für Theoretische Physik, Universit€ at Stuttgart, Stuttgart, D-70569, Germany

  • Received date 15 February 2021, Accepted date 05 May 2021, RevRecd date 03 May 2021, Publish date 07 May 2021,
    Abstract
  • Asymmetric behaviors of capacitance and charging dynamics in the cathode and anode are general for nanoporous supercapacitors. Understanding this behavior is essential for the optimal design of supercapacitors. Herein, we perform constant-potential molecular dynamics simulations to reveal asymmetric features of porous supercapacitors and their effects on capacitance and charging dynamics. Our simulations show that, counterintuitively, charging dynamics can be fast in pores providing slow ion diffusion and vice versa. Unlike electrodes with singlesize pores, multi-pore electrodes show overcharging and accelerated co-ion desorption, which can be attributed to the subtle interplay between the dynamics and charging mechanisms. We find that capacitance and charging dynamics correlate with how the ions respond to an applied cell voltage in the cathode and anode. We demonstrate that symmetrizing this response can help boost power density, which may find practical applications in supercapacitor optimization.

     

    • • Capacitance and charging dynamics of supercapacitors correlate with ion response in the cathode and anode. • Symmetrizing ion response in the cathode and anode can boost the charging dynamics of supercapacitors. • Charging dynamics of narrow pores can be fast despite slow in-pore ion diffusion. • Over-charging occurs in electrodes with multiple pore sizes, which speeds up their charging dynamics.
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