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Aqueous organic redox flow batteries

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Abstract

Redox flow batteries (RFBs) are promising candidates to establish a grid-scale energy storage system for intermittent energy sources. While the current technology of vanadium RFBs has been widely exploited across the world, the rise in the price of vanadium and its limited volumetric energy density have necessitated the development of new kinds of redox active molecules. Organic molecules can be used as new and economical redox couples in RFBs to address these issues. In addition, the redox organic species also provide ample advantages to increase the voltage and solubility, provide multiple numbers of electron transfer, and ensure electrochemical/chemical stability by molecular engineering through simple synthetic methods. This review focuses on the recent developments in aqueous organic RFBs, including the molecular design and the corresponding cycling performance as these organic redox molecules are employed as either the negolyte or posolyte. Various strategies for tuning the electrochemical/chemical characteristics of organic molecules have improved their solubility, redox potential, cycling stability, and crossover issue across a separating membrane. We also put forward new strategies using nanotechnology and our perspective for the future development of this rapidly growing field.

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Acknowledgements

The work is supported by the Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-MA1702-05.

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  1. Vikram Singh and Soeun Kim contributed equally to this work.

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  1. Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea

    Vikram Singh, Soeun Kim, Jungtaek Kang & Hye Ryung Byon

  2. KAIST Institute for NanoCentury, Advanced Battery Center, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea

    Vikram Singh, Soeun Kim & Hye Ryung Byon

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Singh, V., Kim, S., Kang, J. et al. Aqueous organic redox flow batteries. Nano Res. 12, 1988–2001 (2019). https://doi.org/10.1007/s12274-019-2355-2

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