4.8 Article

A Chlorine-Based Redox Electrochemical Capacitor

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 21, Pages 24396-24403

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c03951

Keywords

chlorine-based ionic liquid; electrochemical capacitors; microporous carbon; redox electrolytes; reversible redox reactions

Funding

  1. National Natural Science Foundation of China [51525206, 51972313]
  2. Youth Innovation Promotion Association of the Chinese Academy of Sciences [Y201942]
  3. Liaoning Revitalization Talents Program [XLYC1908015, XLYC2007080]
  4. Strategic Priority Research Program of the Chinese Academy of Sciences [XDA22010602]

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This study reports a chlorine-based redox electrochemical capacitor in an ionic liquid electrolyte, which uses activated carbon as the working electrode to achieve high-energy storage. It provides a solution for new types of high-energy electrochemical capacitors.
Electrochemical capacitors are under the spotlight due to their high power density, but they have a low energy density. Redox electrolytes have emerged as a promising approach to design high-energy electrochemical energy storage devices. Herein, a chlorine-based redox electrochemical capacitor is reported in an ionic liquid electrolyte. The commercial activated carbon is employed as the working electrode to render the reversible redox of chloride ions in an ionic liquid, by the restriction of micropores on neutral chlorine. The carbon material can simultaneously provide electrical double-layer capacitance. The effective integration of a chlorine redox reaction and electrical double layer allows for high-energy electrochemical capacitors. By this means, a rechargeable chlorine-based redox electrochemical capacitor with reversible capacity and good rate capability and cycling stability is obtained. This work offers a solution for a new type of high-energy electrochemical capacitors.

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