Earth-abundant redox couples using durable boron doped diamond electrodes: Beyond vanadium redox couples

Alex M. Bates, William F. Paxton, Joshua M. Spurgeon, Sam D. Park and Mahendra K. Sunkara

Applied Energy, 2021, vol. 282, issue PB, No S0306261920316433

Abstract: In this study, boron doped diamond (BDD) is utilized as a redox flow battery (RFB) electrode, demonstrating its capability with several low-cost redox couples for the first time. Active species cost, electrode corrosion, energy density, and power density are the current issues hindering the widespread adoption of RFBs. Several high-potential and low-cost redox couples, including Ce3+/Ce4+ and Mn2+/Mn3+, are shown to exhibit low overpotentials, high efficiency, and good cyclability on BDD electrodes. Using the Ce3+/Ce4+ redox couple, a formal potential of 1.67 V vs. SHE and a peak separation of 288 mV during cyclic voltammetry was obtained. Low-cost redox species significantly decrease RFB system cost while high potentials increase energy and power density. Demonstrated here, high potentials cannot be supported by traditional carbon-based RFB electrodes due to significant corrosion and gas evolution; however, the inherent properties of BDD negate this effect. This study exhibits the potential of BDD, as an alternative to traditional carbon-based electrodes, to enable a long cycle life, at high coulombic efficiencies, and with high-potential and low-cost redox couples.

Keywords: Boron doped diamond; Cerium; Corrosion; Gas evolution; Low-cost; Redox flow battery (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (1)

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DOI: 10.1016/j.apenergy.2020.116252

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