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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received July 23, 2020
Accepted October 3, 2020

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Electrochemical analysis on how structural and compositional modification of electrode affects power generation in reverse electrodialysis

Jisu Jeong^{1 2} Heajung Song^{1 2} Insoo Choi^1†

¹Division of Energy Engineering, Kangwon National University, 346 Jungang-ro, Samcheok 25913, Korea ²Department of Chemical Engineering, Kangwon National University, 346 Jungang-ro, Samcheok 25913, Korea

ischoi@kangwon.ac.kr

Korean Journal of Chemical Engineering, January 2021, 38(1), 170-178(9), 10.1007/s11814-020-0690-3

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Abstract

We suggest a modified Ti-based electrode for reverse electrodialysis to increase power density and retain long-term durability. Specifically, a mesh-type Ti electrode and electrochemically fabricated Pt/Ti electrode are employed in the reverse electrodialysis single cell. The electrode systems are compared in terms of power output, resistance, specific capacitance, and redox-couple reaction kinetics near the electrode surface. Among the electrodes, Pt/Ti meshembedded cell exhibits the highest jmax (-16.13 A m-2) and Pmax (-0.702 W m-2). The improvement in performance is ascribed to the reduced resistance associated with heterogeneous charge transfer and to the enlarged electrochemical surface area, verified by impedance analysis, and by monitoring the capacitive behavior of the electrodes, respectively. The highest exchange current density of Pt/Ti mesh electrode is attributed to facile electron transfer and reduced power loss in the electrode compartment. Furthermore, the Pt/Ti mesh electrode allows stable operation of reverse electrodialysis for an extended time. Finally, we demonstrate the power generation of a reverse electrodialysis stack built up with multiple pairs of ion exchange membranes for potential commercial application.

Keywords

Reverse Electrodialysis Electrode Modification Composition Structure Power Generation

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