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Electrochemical Energy Reviews ›› 2024, Vol. 7 ›› Issue (1): 7-.doi: 10.1007/s41918-023-00205-6

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Recent Advances in Redox Flow Batteries Employing Metal Coordination Complexes as Redox-Active Species

Bin Liu1, Yiju Li1,3,4, Guocheng Jia2, Tianshou Zhao1,3   

  1. 1. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China;
    2. Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China;
    3. Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
    4. Institute for Advanced Study, The Hong Kong University of Science and Technology, Kowloon, Hong Kong 999077, China
  • 收稿日期:2022-10-26 修回日期:2023-08-23 发布日期:2024-04-03
  • 通讯作者: Guocheng Jia,E-mail:chjiag@ust.hk;Tianshou Zhao,E-mail:zhaots@sustech.edu.cn E-mail:chjiag@ust.hk;zhaots@sustech.edu.cn
  • 基金资助:
    The work described in this paper was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. T23-601/17-R). The authors thank Dr. Chun Wai Tang for valuable advice.

Recent Advances in Redox Flow Batteries Employing Metal Coordination Complexes as Redox-Active Species

Bin Liu1, Yiju Li1,3,4, Guocheng Jia2, Tianshou Zhao1,3   

  1. 1. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China;
    2. Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China;
    3. Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
    4. Institute for Advanced Study, The Hong Kong University of Science and Technology, Kowloon, Hong Kong 999077, China
  • Received:2022-10-26 Revised:2023-08-23 Published:2024-04-03
  • Contact: Guocheng Jia,E-mail:chjiag@ust.hk;Tianshou Zhao,E-mail:zhaots@sustech.edu.cn E-mail:chjiag@ust.hk;zhaots@sustech.edu.cn
  • Supported by:
    The work described in this paper was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. T23-601/17-R). The authors thank Dr. Chun Wai Tang for valuable advice.

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摘要： Redox flow batteries (RFBs) that employ sustainable, abundant, and structure-tunable redox-active species are of great interest for large-scale energy storage. As a vital class of redox-active species, metal coordination complexes (MCCs) possessing the properties of both the organic ligands and transition metal ion centers are attracting increasing attention due to the advantages of multielectron charge transfer, high structural tailorability, and reduced material crossover. Herein, we present a critical overview of RFBs that employ MCCs as redox-active materials in both aqueous and nonaqueous mediums. The progress is comprehensively summarized, including the design strategies, solubility characteristics, electrochemical properties, and battery cycling performance of MCCs. Emphasis is placed on the ligand selection and modification strategies used to tune the critical properties of MCCs, including their redox potential, solubility, cycling stability, and electron transfer redox reactions, to achieve stable cycled RFBs with a high energy density. Furthermore, we discuss the current challenges and perspectives related to the development of MCC-based RFBs for large-scale energy storage implementations.

关键词: Energy storage, Redox flow battery, Metal coordination complex, Electrochemistry, Redox noninnocent ligands

Abstract: Redox flow batteries (RFBs) that employ sustainable, abundant, and structure-tunable redox-active species are of great interest for large-scale energy storage. As a vital class of redox-active species, metal coordination complexes (MCCs) possessing the properties of both the organic ligands and transition metal ion centers are attracting increasing attention due to the advantages of multielectron charge transfer, high structural tailorability, and reduced material crossover. Herein, we present a critical overview of RFBs that employ MCCs as redox-active materials in both aqueous and nonaqueous mediums. The progress is comprehensively summarized, including the design strategies, solubility characteristics, electrochemical properties, and battery cycling performance of MCCs. Emphasis is placed on the ligand selection and modification strategies used to tune the critical properties of MCCs, including their redox potential, solubility, cycling stability, and electron transfer redox reactions, to achieve stable cycled RFBs with a high energy density. Furthermore, we discuss the current challenges and perspectives related to the development of MCC-based RFBs for large-scale energy storage implementations.

Key words: Energy storage, Redox flow battery, Metal coordination complex, Electrochemistry, Redox noninnocent ligands

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