High‐Energy‐Density Chelated Chromium Flow Battery Electrolyte at Neutral pH

Robb, Brian H.; Waters, Scott E.; Marshak, Michael P.

doi:10.1002/asia.202200700

High‐Energy‐Density Chelated Chromium Flow Battery Electrolyte at Neutral pH

Journal Article · 01 September 2022 · Chemistry - An Asian Journal

DOI:https://doi.org/10.1002/asia.202200700· OSTI ID:2422274

^[1]; Waters, Scott E. ^[2]; ^[3]

Department of Chemical and Biological Engineering University of Colorado Boulder USA; OSTI
Department of Chemistry University of Colorado Boulder Boulder CO-80309 USA
Department of Chemistry University of Colorado Boulder Boulder CO-80309 USA; Renewable and Sustainable Energy Institute University of Colorado Boulder USA

Abstract

High‐concentration operation of redox flow batteries (RFBs) is essential for increasing their energy‐storage capacity, but non‐acidic electrolytes struggle to achieve the high concentrations of metal ions dissolved in acid, limiting the development of energy‐dense neutral pH electrolytes. We report neutral pH RFB operation of chromium 1,3‐propylenediaminetetraacetate (CrPDTA) at concentrations of 1.2 M at room temperature and 1.6 M at 40 °C, demonstrating 60% higher negolyte capacity, up to 42.9 Ah L⁻¹, than previously reported for non‐additive‐utilizing solutions of this promising material. With extended full cell cycling, we demonstrate the importance of buffer selection and pH when using the Fumasep E‐620(K) membrane. Finally, we expand the pH operation range of CrPDTA to pH 7, which when cycled at 100 mA cm⁻²against a ferrocyanide posolyte demonstrated excellent coulombic efficiencies >99.7% and energy efficiencies >87%, while operating at almost 700 mV more negative than the thermodynamic hydrogen evolution window.

Research Organization:: Raytheon Technologies Corp., Waltham, MA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

DOE Contract Number:: AR0000994

OSTI ID:: 2422274

Journal Information:: Chemistry - An Asian Journal, Journal Name: Chemistry - An Asian Journal Journal Issue: 19 Vol. 17; ISSN 1861-4728

Publisher:: Wiley

Country of Publication:: United States

Language:: English

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