期刊
GREEN ENERGY & ENVIRONMENT
卷 7, 期 1, 页码 95-104出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.gee.2021.05.001
关键词
Nanoporous carbon; Charging dynamics; Charge storage mechanism; Overfilling; Overcharging
类别
资金
- Na-tional Natural Science Foundation of China [51876072]
- Hubei Provincial Natural Science Foundation of China [2019CFA002, 2020CFA093]
- Program for HUST Academic Frontier Youth Team
Asymmetric behaviors of capacitance and charging dynamics in nanoporous supercapacitors play a crucial role in the optimal design of supercapacitors. Molecular dynamics simulations reveal the asymmetric features of porous supercapacitors and their effects on capacitance and charging dynamics. The response of ions to an applied cell voltage influences the capacitance and charging dynamics, and symmetrizing this response can enhance the power density of supercapacitors.
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. (c) 2021, Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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