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Understanding the role of the porous electrode microstructure in redox flow battery performance using an experimentally validated 3D pore-scale lattice Boltzmann model

Zhang, Duo, Forner-Cuenca, Antoni, Taiwo, Oluwadamilola O., Yufit, Vladimir, Brushett, Fikile R., Brandon, Nigel P., Gu, Sai and Cai, Qiong (2020) Understanding the role of the porous electrode microstructure in redox flow battery performance using an experimentally validated 3D pore-scale lattice Boltzmann model Journal of Power Sources, 447, 227249.

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Abstract

The porous structure of the electrodes in redox flow batteries (RFBs) plays a critical role in their performance. We develop a framework for understanding the coupled transport and reaction processes in electrodes by combining lattice Boltzmann modelling (LBM) with experimental measurement of electrochemical performance and X-ray computed tomography (CT). 3D pore-scale LBM simulations of a non-aqueous RFB are conducted on the detailed 3D microstructure of three different electrodes (Freudenberg paper, SGL paper and carbon cloth) obtained using X-ray CT. The flow of electrolyte and species within the porous structure as well as electrochemical reactions at the interface between the carbon fibers of the electrode and the liquid electrolyte are solved by a lattice Boltzmann approach. The simulated electrochemical performances are compared against the experimental measurements with excellent agreement, indicating the validity of the LBM simulations for predicting the RFB performance. Electrodes featuring one single dominant peak (i.e., Freudenberg paper and carbon cloth) show better electrochemical performance than the electrode with multiple dominant peaks over a wide pore size distribution (i.e., SGL paper), whilst the presence of a small fraction of large pores is beneficial for pressure drop. This framework is useful to design electrodes with optimal microstructures for RFB applications.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Zhang, Duo
Forner-Cuenca, Antoni
Taiwo, Oluwadamilola O.
Yufit, Vladimir
Brushett, Fikile R.
Brandon, Nigel P.
Gu, Saisai.gu@surrey.ac.uk
Cai, Qiongq.cai@surrey.ac.uk
Date : 31 January 2020
Funders : Engineering and Physical Sciences Research Council (EPSRC), European Commission 7th Framework Programme, iComFluid Projects
DOI : 10.1016/j.jpowsour.2019.227249
Copyright Disclaimer : © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Redox flow battery; Porous electrodes; Lattice Boltzmann model; X-ray computed tomography; Electrochemical performance
Depositing User : Clive Harris
Date Deposited : 20 Nov 2019 13:50
Last Modified : 20 Nov 2019 13:50
URI: http://epubs.surrey.ac.uk/id/eprint/853190

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