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A 1.51 V pH Neutral Redox Flow Battery towards Scalable Energy Storage

Abstract

Aqueous redox flow batteries using low-cost organic and inorganic active materials have received growing interest for sustainable energy storage. In this study, low-cost, high redox potential (1.08 V vs NHE) and high capacity ammonium bromide (NH4Br, 214.4 Ah/L) catholyte was coupled with the organic viologen anolyte to demonstrate 1.51 V high voltage (SPr)2V/Brˉ aqueous redox flow batteries under pH neutral conditions for the first time. Benefitted from the high water solubility of both NH4Br catholyte and (SPr)2V anolyte, the newly designed (SPr)2V/Brˉ organic flow battery was operated at up to 1.5 M and an energy density of up to 30.4 Wh/L. Using multiwall carbon nanotubes as electrochemical additive for Br3ˉ/Brˉ redox couple, the highly energy dense (SPr)2V/Brˉ flow battery manifested outstanding current performance, up to 78% energy efficiencies at 40 mA/cm2 current density, and 227 mW/cm2 power density, the highest power density known for pH neutral organic flow batteries.

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Supplementary files

Publication details

The article was received on 08 Feb 2019, accepted on 12 Mar 2019 and first published on 13 Mar 2019


Article type: Paper
DOI: 10.1039/C9TA01469A
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    A 1.51 V pH Neutral Redox Flow Battery towards Scalable Energy Storage

    J. Luo, W. Wu, C. R. DeBruler, B. Hu, M. Hu and T. Liu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA01469A

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