Comparative Study of Organic Radical Cation Stability and Coulombic Efficiency for Nonaqueous Redox Flow Battery Applications

N. Harsha Attanayake, T. Malsha Suduwella, Yichao Yan, Aman Preet Kaur, Zhiming Liang, Melanie S. Sanford, Susan A. Odom

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

When building energy dense redox flow batteries, the cell voltage of the flow cell is critical. However, the stability of the charged forms of redox-active species often suffers at extreme redox potentials due to either self-discharge in electrolyte solutions or molecular degradation, presenting a challenge for achieving high cell voltages. In this work, we explore the chemical and cycling stability of a series of organic posolytes with a 0.8 V vs Cp2Fe0/+range in oxidation potentials in nonaqueous electrolyte systems. The relationship between the coulombic efficiency of posolytes during galvanostatic cycling and the chemical stability of their charged forms was compared by performing bulk electrolysis and UV-vis spectroscopy experiments. In general, these studies show that organic posolytes with high oxidation potentials exhibit either self-discharge and/or molecular degradation in their charged forms, lowering coulombic efficiency and/or cycle lifetime in galvanostatic cycling.

Original languageEnglish
Pages (from-to)14170-14179
Number of pages10
JournalJournal of Physical Chemistry C
Volume125
Issue number26
DOIs
StatePublished - Jul 8 2021

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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