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In operando visualization of redox flow battery in membrane-free microfluidic platform

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Title
In operando visualization of redox flow battery in membrane-free microfluidic platform
Author(s)
Park, Hyungjoo; Kwon, Giyun; Lee, Hyomin; Lee, Kyunam; Park, Soo Young; Kwon, Ji Eon; Kisuk Kang; Kim, Sung Jae
Publication Date
2022-03
Journal
Proceedings of the National Academy of Sciences of the United States of America, v.119, no.9
Publisher
NLM (Medline)
Abstract
Copyright © 2022 the Author(s). Published by PNAS.Redox flow batteries (RFBs) are attractive large-scale energy storage techniques, achieving remarkable progress in performance enhancement for the last decades. Nevertheless, an in-depth understanding of the reaction mechanism still remains challenging due to its unique operation mechanism, where electrochemistry and hydrodynamics simultaneously govern battery performance. Thus, to elucidate the precise reactions occurring in RFB systems, an appropriate analysis technique that enables the real-time observation of electrokinetic phenomena is indispensable. Herein, we report in operando visualization and analytical study of RFBs by employing a membrane-free microfluidic platform, that is, a membrane-free microfluidic RFB. Using this platform, the electrokinetic investigations were carried out for the 5,10-bis(2-methoxyethyl)-5,10-dihydrophenazine (BMEPZ) catholyte, which has been recently proposed as a high-performance multiredox organic molecule. Taking advantage of the inherent colorimetric property of BMEPZ, we unravel the intrinsic electrochemical properties in terms of charge and mass transfer kinetics during the multiredox reaction through in operando visualization, which enables theoretical study of physicochemical hydrodynamics in electrochemical systems. Based on insights on the electrokinetic limitations in RFBs, we verify the validity of electrode geometry design that can suppress the range of the depletion region, leading to enhanced cell performance.
URI
https://pr.ibs.re.kr/handle/8788114/11987
DOI
10.1073/pnas.2114947119
ISSN
0027-8424
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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