An activated carbon cloth anode obtained with a fast molten salt method for high-performance supercapacitors

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作者：
Han, Xiangyu [1 ,3 ]
Zhang, Yafei [4 ]
Wan, Jing [2 ]
Xu, Weina [2 ]
Li, Jien [2 ]
Hu, Chenguo [2 ]
Liu, Guanlin [2 ]
Cheng, Xinlu [1 ]
机构：
[1] Institute of Atomic and Molecular Physics, Sichuan University, Chengdu,610065, China
[2] Department of Applied Physics, Chongqing University, Chongqing,400044, China
[3] School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing,400074, China
[4] College of Information Science and Engineering, Chengdu University, Chengdu,610106, China
来源：
Journal of Alloys and Compounds | 2021年 / 838卷
关键词：
Carbon materials are the most important anode materials used in supercapacitors. However; there are still great challenges in improving their low specific capacitance and energy density. In this study; a fast molten salt method was developed for the preparation of a super-high capacity activated carbon cloth anode. The nitrogen-activated carbon cloth electrode (NCC) showed better electrochemical performance than most of the carbon-based materials reported on previously. The maximum areal capacitance of the nitrogen-activated carbon cloth electrode was 6.72 F cm−2 at the current density of 2 mA cm−2. By employing the first-principle calculations method; it was derived that the adsorption energy of the K atoms on the graphite increased with the increase in nitrogen doping; especially on the pyridinic nitrogen (N-6). In addition; when the NCC and Ni-Co-S@CC electrodes were assembled into an asymmetric supercapacitor (ASC); the ASC demonstrated an operation in a large potential window of 1.8 V; and it achieved a high volumetric energy density of 23.51 mWh cm−3 at a power density of 1808 mW cm−3. This work showed the super high capacity of activated carbon cloth as a new anode material for high-performance supercapacitors prepared using a simple molten salt method. © 2020 Elsevier B.V;
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