Issue 25, 2024

Highly stable and high performance iodine redox flow batteries using host–guest interaction of (2-hydroxypropyl)-β-cyclodextrin additive

Abstract

Solutions to enhance the performance of aqueous redox flow batteries (ARFBs) using iodine as the active material for the catholyte are explored. When iodine is used, the most serious problem that occurs is undesirable I2 film as a byproduct of redox reactions of the iodine electrolyte. To suppress the formation of I2 film, host–guest interaction of (2-hydroxypropyl)-β-cyclodextrin (HP-β-CD) additive is suggested. With the unique structure of HP-β-CD, the aqueous solubility of I2 increases, and the desired reactions of iodine to form the I3 ion from the complex consisting of I2 and HP-β-CD works well, promoting stable operation of ARFBs using iodine with HP-β-CD included in the electrolyte over a long time, even with high iodine concentrations. Thus, these ARFBs address the undesirable I2 film issue and enhance the aqueous solubility and reactivity for the desirable reaction of iodine, increasing the potential for commercialization of ARFBs.

Graphical abstract: Highly stable and high performance iodine redox flow batteries using host–guest interaction of (2-hydroxypropyl)-β-cyclodextrin additive

Supplementary files

Article information

Article type
Paper
Submitted
30 Nov 2023
Accepted
31 Jan 2024
First published
03 Feb 2024

J. Mater. Chem. A, 2024,12, 15186-15193

Highly stable and high performance iodine redox flow batteries using host–guest interaction of (2-hydroxypropyl)-β-cyclodextrin additive

M. Shin, C. Noh and Y. Kwon, J. Mater. Chem. A, 2024, 12, 15186 DOI: 10.1039/D3TA07413G

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