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.
Original language | English |
---|---|
Pages (from-to) | 9130-9136 |
Number of pages | 7 |
Journal | Journal of Materials Chemistry A |
Volume | 7 |
Issue number | 15 |
DOIs | |
State | Published - 2019 |
Externally published | Yes |