Journal
CURRENT OPINION IN ELECTROCHEMISTRY
Volume 37, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.coelec.2022.101188
Keywords
Energy storage Redox flow batteries Bipolar redox-active materials; Bipolar membranes Redox-active organic materials Aqueous acid; base redox flow batteries
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The development of post-vanadium electrolytes using abundant materials with versatile redox chemistries enables cost-effective energy storage and widespread implementation of redox flow batteries (RFBs). Cross-contamination of catholyte/anolyte in membrane-based RFBs has been a technological hurdle toward long-term cyclability, but new materials chemistry and cell chemistry have been demonstrated to tackle this challenge. The use of bipolar redox-active materials and bipolar membranes shows promise in solving the cross-contamination issue.
The development of post-vanadium electrolytes using abundant materials with versatile redox chemistries will enable costeffective energy storage and widespread implementation of redox flow batteries (RFBs). However, performance-loss due to cross-contamination of catholyte/anolyte in the membranebased RFBs becomes a technological hurdle toward long-term cyclability. To tackle such challenge, new materials chemistry and cell chemistry have been demonstrated. A promising class of bipolar redox-active materials emerges, which permits the use of the same electrolyte in both half-cells and can ultimately solve the detrimental cross-contamination. In addition, new cell configuration, by using bipolar membranes with stacked anionand cation-selective layers, is developed to suppress the crosscontamination through the Donnan-exclusion effect. Here, an overview of the most recent advances in bipolar redox-active materials and bipolar membranes for RFBs is provided.
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