Progress and prospects of pH-neutral aqueous organic redox flow batteries: Electrolytes and membranes

Peng, Kang; Tang, Gonggen; Zhang, Chao; Yang, Xian; Zuo, Peipei; Xiang, Zhanfeng; Yao, Zhong; Yang, Zhengjin; Xu, Tongwen

doi:10.1016/j.jechem.2024.04.031

Journal of Energy Chemistry

2024

DOI: 10.1016/j.jechem.2024.04.031

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Progress and prospects of pH-neutral aqueous organic redox flow batteries: Electrolytes and membranes

Kang Peng,

Gonggen Tang,

Chao Zhang

et al.

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Cited by 3 publications

References 166 publications

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Azoniafluorenones: A New Family of Two‐Electron Storage Electrolytes for Sustainable Near‐Neutral pH Aqueous Organic Flow Battery

Artault,

Gonzalez,

Damlin

et al. 2024

Advanced Energy Materials

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Fluorenones are suitable candidates for negolytes in flow batteries, as they demonstrate the ability to store 2 electrons, and can achieve reversibility, solubility, and stability with appropriate molecular design. However, limitations persist such as the use of alkaline media, high redox potentials, and a limited scope for optimization. Herein, azoniafluorenones is reported as a novel class of negolytes. They can be readily accessed in a highly modular fashion from inexpensive commercially available materials (e.g., boronic acids). Variations in the substitution patterns reveal the 3‐substituted N‐alkylated AZON3, which demonstrates excellent solubility at neutral pH (1.64 m) with two low reversible redox potentials (−0.31 and −0.58 V vs Ag/AgCl). AZON3 exhibits high stability when evaluated at high concentration in a neutral supporting electrolyte (1 m in 3 m KCl), paired with BTMAP‐Fc on the positive side. Capacity retentions of 99.95% and 99.91% per cycle (99.35% and 99.21% per day) are achieved when cycling with 1 and 2 electrons, respectively, coupled with high volumetric capacity of 46.4 Ah L−1 (87% of capacity utilization).

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Azoniafluorenones: A New Family of Two‐Electron Storage Electrolytes for Sustainable Near‐Neutral pH Aqueous Organic Flow Battery

Artault,

Gonzalez,

Damlin

et al. 2024

Advanced Energy Materials

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Metal Coordination Compounds for Organic Redox Flow Batteries

Gao,

Xia,

et al. 2024

Batteries & Supercaps

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Along with the continuous optimization of the energy structure, more and more electricity come from intermittent renewable energy sources such as wind and solar energy. Redox flow batteries (RFBs) have the advantage that energy and power can be regulated independently, so they are widely used in large‐scale energy storage. Redox active materials are the important components of RFBs, which determine the performance of the battery and the cost of energy storage. Some metal coordination compounds (MCCs) and their derivatives have been considered redox active materials that can replace metal‐based redox flow batteries due to their properties such as tunability, high abundance and sustainability. MCCs can provide higher energy density because they are highly soluble both in the initial state and in any charged state during the battery cycling process. MCCs have also attracted a lot of attention from researchers because of their high economic value, low toxicity, and wide availability. This review provides an overview of the recent development of soluble metal coordination compounds, such as Ferrocene, and concludes with an in‐depth discussion of the prospects of metal coordination compounds for application in organic redox flow batteries.

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Redox-active molecules for aqueous electrolytes of energy storage devices: A review on fundamental aspects, current progress, and prospects

Chen,

Zhitomirsky

et al. 2024

Materials Science and Engineering: R: Reports

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Progress and prospects of pH-neutral aqueous organic redox flow batteries: Electrolytes and membranes

Cited by 3 publications

References 166 publications

Azoniafluorenones: A New Family of Two‐Electron Storage Electrolytes for Sustainable Near‐Neutral pH Aqueous Organic Flow Battery

Azoniafluorenones: A New Family of Two‐Electron Storage Electrolytes for Sustainable Near‐Neutral pH Aqueous Organic Flow Battery

Metal Coordination Compounds for Organic Redox Flow Batteries

Redox-active molecules for aqueous electrolytes of energy storage devices: A review on fundamental aspects, current progress, and prospects

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