Chemical Research in Chinese Universities ›› 2025, Vol. 41 ›› Issue (3): 464-471.doi: 10.1007/s40242-025-5051-7

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Towards Bio-derived Electrolytes for Sustainable Redox Flow Batteries

HUO Xiaoyu1, SHI Xingyi2, AN Liang1,3,4   

  1. 1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR 999077, P. R. China;
    2. Department of Energy Science and Engineering, City University of Hong Kong (Dongguan), Dongguan 523808, P. R. China;
    3. Research Institute for Advanced Manufacturing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR 999077, P. R. China;
    4. Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR 999077, P. R. China
  • Received:2025-03-31 Revised:2025-05-06 Online:2025-06-01 Published:2025-05-27
  • Contact: SHI Xingyi,E-mail:xingyi.shi@cityu-dg.edu.cn;AN Liang,E-mail:liang.an@polyu.edu.hk E-mail:xingyi.shi@cityu-dg.edu.cn;liang.an@polyu.edu.hk
  • Supported by:
    This work was supported by a grant from the Research Institute for Smart Energy (No. CDB2), a grant from the Research Institute for Advanced Manufacturing (No. CD8Z) and a grant from the Carbon Neutrality Funding Scheme (No. WZ2R) at The Hong Kong Polytechnic University, China.

Abstract: The transition to renewable energy systems has intensified the need for sustainable, large-scale energy storage solutions, and redox flow batteries (RFBs) have emerged as a promising technology due to their scalability, safety, and long cycle life. However, conventional RFBs that rely on metal-based electrolytes face significant challenges, including high cost, resource scarcity, and environmental toxicity. Bio-derived electrolytes offer a sustainable alternative that combines renewable sources with tunable electrochemical properties. This review comprehensively summarizes the latest progress of RFB bio-derived electrolytes and discusses the electrochemical performances of plant-derived quinones, lignin derivatives, and fungal metabolites. The limitations in the systems, such as lower solubility limits, crossover issues, and long-term stability are evaluated, with suggested future research directions. The work provides valuable insights for the development of next-generation green RFB systems, which align with global sustainability goals.

Key words: Redox flow battery, Electrolyte, Bio-derived electrolyte, Biomaterial, Sustainability