Organic Electrolytes for pH‐Neutral Aqueous Organic Redox Flow Batteries

Due to decoupled energy and power, the aqueous organic redox flow battery (AORFB) represents a promising energy storage technology that stores energy in redox‐active organic compounds dissolved in aqueous electrolytes. The organic compounds are composed of earth‐abundant elements and are therefore p...

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Bibliographic Details
Published in:Advanced functional materials 2022-02, Vol.32 (9), p.n/a
Main Authors: Chen, Qianru, Lv, Yangguang, Yuan, Zhizhang, Li, Xianfeng, Yu, Guihua, Yang, Zhengjin, Xu, Tongwen
Format: Article
Language:English
Subjects:
Aqueous electrolytes
aqueous organic redox flow batteries
Electrolytes
Energy storage
Inorganic salts
Materials science
molecular engineering
Nonaqueous electrolytes
Organic compounds
pH‐neutral
Rechargeable batteries
review
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Summary:Due to decoupled energy and power, the aqueous organic redox flow battery (AORFB) represents a promising energy storage technology that stores energy in redox‐active organic compounds dissolved in aqueous electrolytes. The organic compounds are composed of earth‐abundant elements and are therefore potentially cost‐effective. Their structures are diverse and highly tunable, rendering it possible to regulate the redox potential, water solubility, and cycling lifespan. Therefore, the adoption of redox‐active organics greatly expands the space for enabling exceeding performance merits compared to their inorganic counterparts. Herein, this work reviews the molecular design and engineering scheme of organic electrolytes, focusing exclusively on pH‐neutral AORFB that uses non‐corrosive and nonflammable pH‐neutral aqueous electrolytes with inexpensive inorganic salts as supporting electrolytes and features high safety, low corrosivity, low cost, and environmental benignity. Some comments on the present challenges and prospects of this ascendant domain are also presented. The pH‐neutral aqueous organic redox flow battery (AORFB) represents a safe and cost‐effective energy storage technology. Redox‐active organic compounds are critical components that directly determine AORFB performances. This review summarizes the recent progress in molecular engineering of redox‐active compounds targeting exclusively pH‐neutral AORFB and concludes the general design principles that can be used as guidelines. Challenges and perspectives are also discussed.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202108777