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Issue 15, 2019
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A 1.51 V pH neutral redox flow battery towards scalable energy storage

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Abstract

Aqueous redox flow batteries using low-cost organic and inorganic active materials have received growing interest for sustainable energy storage. In this study, a low-cost, high redox potential (1.08 V vs. NHE) and high capacity ammonium bromide (NH4Br, 214.4 A h L−1) catholyte was coupled with an organic viologen anolyte to demonstrate 1.51 V high voltage (SPr)2V/Br aqueous redox flow batteries under pH neutral conditions for the first time. Benefitting from the high water solubility of both the NH4Br catholyte and (SPr)2V anolyte, the newly designed (SPr)2V/Br organic flow battery was operated at up to 1.5 M and an energy density of up to 30.4 W h L−1. Using multiwall carbon nanotubes as an electrochemical additive for the Br3/Br redox couple, the highly energy dense (SPr)2V/Br flow battery manifested outstanding current performance, up to 78% energy efficiency at 40 mA cm−2 current density and 227 mW cm−2 power density, the highest power density known for pH neutral organic flow batteries.

Graphical abstract: A 1.51 V pH neutral redox flow battery towards scalable energy storage

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Supplementary files

Article information


Submitted
08 Feb 2019
Accepted
12 Mar 2019
First published
13 Mar 2019

J. Mater. Chem. A, 2019,7, 9130-9136
Article type
Paper
Author version available

A 1.51 V pH neutral redox flow battery towards scalable energy storage

J. Luo, W. Wu, C. Debruler, B. Hu, M. Hu and T. L. Liu, J. Mater. Chem. A, 2019, 7, 9130
DOI: 10.1039/C9TA01469A

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