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Review | Open Access

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

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
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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

supercapacitorcarbon materialsself-dischargeredox electrolyte

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Energy Materials and Devices
Volume 1 Issue 1,
September 2023
Article number: 9370009
DOI: 10.26599/EMD.2023.9370009
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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Received: 20 September 2023
Revised: 15 October 2023
Accepted: 16 October 2023
Published: 26 October 2023
© The Author(s) 2023. Published by Tsinghua University Press.

The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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