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research-article

Membrane-less Hydrogen Iron Redox Flow Battery

[+] Author and Article Information
Kyamra Marma

Electrochemical and Thermal Energy Laboratory, Department of Mechanical Engineering, Northern Illinois University, DeKalb, Illinois, 60115
kymr.me@gmail.com

Jayanth Kolli

Electrochemical and Thermal Energy Laboratory, Department of Mechanical Engineering, Northern Illinois University, DeKalb, Illinois, 60115
jayanth34@gmail.com

Kyu Taek Cho

Electrochemical and Thermal Energy Laboratory, Department of Mechanical Engineering, Northern Illinois University, DeKalb, Illinois, 60115
kcho@niu.edu

1Corresponding author.

ASME doi:10.1115/1.4040329 History: Received January 19, 2018; Revised May 10, 2018

Abstract

In this study, a new type of redox flow battery (RFB) named 'membrane-less hydrogen-iron RFB' was investigated for the first time to resolve the key issues of conventional battery systems such as high cost and safety concerns. Research focus in this study was placed on defining key design parameters to make this new system promising as a RFB. Crossing rate of reactants over carbon porous electrode (CPE) was controlled by modifying its pore structure with Teflon impregnation, and effects of the Teflon on crossover, kinetic, ohmic and mass transfer was investigated by cell-based test and one-dimensional computational model. It was found that cell performance of the membrane-less system was equivalent to that of membrane system. Especially, cell resistance in the membrane-less system was much more stable than in the membrane system, indicating the membrane-less system is more durable than the membrane system. A physics-based one dimensional model was developed additionally to understand the electrochemical behavior of reactants and voltage losses in the cell during operation, and it was found that the reactant crossover, which is the most changeling issue in the conventional membrane-less system, is not the critical issue in the system, and research in the future should be focused on increasing the kinetic losses by using carbon porous electron having least contents of Teflon.

Copyright (c) 2018 by ASME
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