Visualization and Electrical Response of Electroconvective Vortices on the Surface of Homo/Heterogeneous Ion Exchange Membranes

Myeonghyeon Cho; Jinwoong Choi; Bumjoo Kim

doi:10.3740/MRSK.2023.33.1.21

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2023 Vol.33, Issue 1 Preview Page

Research Paper

Visualization and Electrical Response of Electroconvective Vortices on the Surface of Homo/Heterogeneous Ion Exchange Membranes 이온교환막의 균질/비균질 표면 형상에 따른 전기 와류 가시화 및 전기적 특성 분석

27 January 2023. pp. 21-28

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Abstract

The electromembrane process, which has advantages such as scalability, sustainability, and eco-friendliness, is used in renewable energy fields such as fuel cells and reverse electrodialysis power generation. Most of the research to visualize the internal flow in the electromembrane process has mainly been conducted on heterogeneous ion exchange membranes, because of the non-uniform swelling characteristics of the homogeneous membrane. In this study, we successfully visualize the electroconvective vortices near the Nafion homogeneous membrane in PDMS-based microfluidic devices. To reinforce the mechanical rigidity and minimize the non-uniform swelling characteristics of the homogeneous membrane, a newly developed swelling supporter was additionally adapted to the Nafion membrane. Thus, a clear image of electroconvective vortices near the Nafion membrane could be obtained and visualized. As a result, we observed that the heterogeneous membrane has relatively stronger electroconvective vortices compared to the Nafion homogeneous membranes. Regarding electrical response, the Nafion membrane has a higher limiting current and less overlimiting current compared to the heterogeneous membrane. Based on our visualization, it is assumed that the heterogeneous membrane has more activated electroconvective vortices, which lower electrical resistance in the overlimiting current regime. We anticipate that this work can contribute to the fundamental understanding of the ion transport characteristics depending on the homogeneity of ion exchange membranes.

Keywords

ion exchange membrane

Nafion 211

homogeneity

heterogeneity

electroconvective vortex

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 33
No :1
Pages :21-28
Received Date : 2022-12-26
Revised Date : 2023-01-08
Accepted Date : 2023-01-17
DOI :https://doi.org/10.3740/MRSK.2023.33.1.21

Korean Journal of Materials ResearchISSN:1225-0562(Print) 2287-7258(Online)한국재료학회

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