Journal of Materials Chemistry A
08 May 2021
Ionophobic nanopores enhancing the capacitance and charging dynamics in supercapacitors with ionic liquids
Zhongdong Gan,ab Yanlei Wang,*bcd Mi Wang,bc Enlai Gao,e Feng Huo,bc Weilu Ding,bc Hongyan He*bcd and Suojiang Zhang*abc
a School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
b Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
c University of Chinese Academy of Sciences, Beijing 100049, China
d Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China
e Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, China
10.1039/D1TA01818C
Nano-porous electrodes combined with ionic liquids (ILs) are widely favored to promote the energy density of supercapacitors. However, this is always accompanied by the reduced power density, especially considering the high viscosity and large steric hindrance of ILs. Here, we use computational simulations coupled with the equivalent circuit model to quantify the charging process and overall performance of the IL-based supercapacitor. We find that the ions in the electrode with ionophobic pores display a new charging mechanism under a threshold potential, namely co-ion adsorption, which has been ignored before. This identified abnormal charging process can not only efficiently enhance the differential capacitance but also remarkably speed up the charging dynamics.
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