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A Sulfonate-Functionalized Viologen Enabling Neutral Cation Exchange, Aqueous Organic Redox Flow Batteries toward Renewable Energy Storage
journal contribution
posted on 2018-02-13, 00:00 authored by Camden DeBruler, Bo Hu, Jared Moss, Jian Luo, T. Leo LiuRedox flow batteries
using synthetically tunable and resource abundant
organic molecules have gained increasing attention for large-scale
energy storage. Herein we report a sulfonate-functionalized viologen
molecule, 1,1′-bis(3-sulfonatopropyl)-4,4′-bipyridinium, (SPr)2V, as an anolyte
in neutral aqueous organic redox flow batteries (AORFBs) functioning
through a cation charge-transfer mechanism. Demonstrated (SPr)2V/KI AORFBs manifested high
current performance from 40 to 100 mA/cm2 with up to 71%
energy efficiency. In extended cycling studies, the (SPr)2V/KI redox flow battery delivered
stable cycling performance at 60 mA/cm2, up to 67% energy
efficiency, and 99.99% capacity retention per cycle. Density functional
theory modeling of the electrostatic charge surface of (SPr)2V and its charged state, [(SPr)2V]–1, suggests charge repulsion and size exclusion enable their
compatibility with a cation exchange membrane. The present findings
expand the battery design of neutral viologen AORFBs and represent
an attractive RFB technology for sustainable and benign renewable
energy storage.
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SPrsulfonate-functionalized viologen moleculeSulfonate-Functionalized Viologen Enabling Neutral Cation ExchangeAORFB2 VAqueous Organic Redox Flow BatteriesefficiencyRFBcyclingmAcation charge-transfer mechanismcation exchange membraneenergy storageKIredox flow batteriesperformanceRenewable Energy Storage Redox flow batteries
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