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Energy Materials and Devices 2023, 1(1): 9370009 https://doi.org/10.26599/EMD.2023.9370009
Review | Open Access | Issue | Published: 26 October 2023

Redox electrolyte-enhanced carbon-based supercapacitors: recent advances and future perspectives

Show Author's Information Jiyong Shi1,2,  Xiaodong Tian1,3( ),  Yan Song1,3( ),  Tao Yang1,  Shengliang Hu2( ),  Zhanjun Liu1,3
CAS Key Laboratory for Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
North University of China, Taiyuan 030051, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Keywords:
supercapacitor, carbon materials, self-discharge, redox electrolyte
Cite this article:
Shi J, Tian X, Song Y, et al. Redox electrolyte-enhanced carbon-based supercapacitors: recent advances and future perspectives. Energy Materials and Devices, 2023, 1(1): 9370009. https://doi.org/10.26599/EMD.2023.9370009
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Abstract Full text About this article

With the continuous advancement in the dual-carbon strategy, the upswell in the demand for renewable energy sources has motivated extensive research on the development of novel energy storage technologies. As a new type of energy storage device, carbon-based redox-enhanced supercapacitors (RE-SCs) are designed by employing soluble redox electrolytes into the existing devices, exploiting the merits of the diffusion-controlled faradaic process of the redox electrolyte at the surface of carbon electrodes, thus leading to improved energy density without the cost of power density. During the past years, great progress has been made in the design of novel redox electrolytes and the configuration of new devices. However, the development of these systems is plagued by severe self-discharge. Herein, a comprehensive picture of the fundamentals, together with a discussion and outline of the challenges and future perspectives of RE-SCs, are provided. We highlight the impacts of redox electrolytes on capacitance, energy density, and power output. Notably, the self-discharge behavior owing to the introduction of redox electrolyte and its mechanism are also discussed, followed by a summary of the strategies from materials to system optimization. Furthermore, possible directions for future research are discussed.


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About this article

Redox electrolyte-enhanced carbon-based supercapacitors: recent advances and future perspectives

Show Author's information Jiyong Shi1,2, Xiaodong Tian1,3( ), Yan Song1,3( ), Tao Yang1, Shengliang Hu2( ), Zhanjun Liu1,3
CAS Key Laboratory for Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
North University of China, Taiyuan 030051, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Abstract

With the continuous advancement in the dual-carbon strategy, the upswell in the demand for renewable energy sources has motivated extensive research on the development of novel energy storage technologies. As a new type of energy storage device, carbon-based redox-enhanced supercapacitors (RE-SCs) are designed by employing soluble redox electrolytes into the existing devices, exploiting the merits of the diffusion-controlled faradaic process of the redox electrolyte at the surface of carbon electrodes, thus leading to improved energy density without the cost of power density. During the past years, great progress has been made in the design of novel redox electrolytes and the configuration of new devices. However, the development of these systems is plagued by severe self-discharge. Herein, a comprehensive picture of the fundamentals, together with a discussion and outline of the challenges and future perspectives of RE-SCs, are provided. We highlight the impacts of redox electrolytes on capacitance, energy density, and power output. Notably, the self-discharge behavior owing to the introduction of redox electrolyte and its mechanism are also discussed, followed by a summary of the strategies from materials to system optimization. Furthermore, possible directions for future research are discussed.

Keywords: supercapacitor, carbon materials, self-discharge, redox electrolyte

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Publication history
Copyright
Acknowledgements
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Publication history

Received: 20 September 2023
Revised: 15 October 2023
Accepted: 16 October 2023
Published: 26 October 2023
Issue date: October 2023

Copyright

© The Author(s) 2023. Published by Tsinghua University Press.

Acknowledgements

Acknowledgment

The financial support for this work was provided by National Natural Science Foundation of China (52072383, U21A2061, 22209197), Youth Innovation Promotion Association of the Chinese Academy of Sciences (20233432), Natural Science Foundation of Shanxi Province (202203021211002, 202203021222399), and Innovation Fund of Shanxi Institute of Coal Chemistry (SCJC-XCL-2022-08).

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