Single-Molecule Redox-Targeting Reactions for a pH-Neutral Aqueous Organic Redox Flow Battery |
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Authors: | Dr Mingyue Zhou Dr Yan Chen Dr Manohar Salla Hang Zhang Xun Wang Dr Srinivasa Reddy Mothe Prof Qing Wang |
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Institution: | Department of Materials Science and Engineering, National University of Singapore, 117576 Singapore, Singapore |
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Abstract: | Aqueous organic redox flow batteries (AORFBs) have received considerable attention for large-scale energy storage. Quinone derivatives, such as 9,10-anthraquinone-2,7-disulphonic acid (2,7-AQDS), have been explored intensively owing to potentially low cost and swift reaction kinetics. However, the low solubility in pH-neutral electrolytes restricts their application to corrosive acidic or caustic systems. Herein, the single molecule redox-targeting reactions of 2,7-AQDS anolyte are presented to circumvent its solubility limit in pH-neutral electrolytes. Polyimide was employed as a low-cost high-capacity solid material to boost the capacity of 2,7-AQDS electrolyte to 97 Ah L−1. Through in situ FTIR spectroscopy, a hydrogen-bonding mediated reaction mechanism was disclosed. In conjunction with NaI as catholyte and nickel hexacyanoferrate as the catholyte capacity booster, a single-molecule redox-targeting reaction-based full cell with energy density up to 39 Wh L−1 was demonstrated. |
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Keywords: | anthraquinone energy storage redox flow batteries redox targeting spectroelectrochemistry |
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