The effect of wetting area in carbon paper electrode on the performance of vanadium redox flow batteries: A three-dimensional lattice Boltzmann study

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Title: The effect of wetting area in carbon paper electrode on the performance of vanadium redox flow batteries: A three-dimensional lattice Boltzmann study
Author(s): Zhang, D
Cai, Q
Taiwo, OO
Yufit, V
Brandon, NP
Gu, S
Item Type: Journal Article
Abstract: The vanadium redox flow battery (VRFB) has emerged as a promising technology for large-scale storage of intermittent power generated from renewable energy sources due to its advantages such as scalability, high energy efficiency and low cost. In the current study, a three-dimensional(3D) Lattice Boltzmann model is developed to simulate the transport mechanisms of electrolyte flow, species and charge in the vanadium redox flow battery at the micro pore scale. An electrochemical model using the Butler-Volmer equation is used to provide species and charge coupling at the surface of active electrode. The detailed structure of the carbon paper electrode is obtained using X-ray Computed Tomography(CT). The new model developed in the paper is able to predict the local concentration of different species, over-potential and current density profiles under charge/discharge conditions. The simulated capillary pressure as a function of electrolyte volume fraction for electrolyte wetting process in carbon paper electrode is presented. Different wet surface area of carbon paper electrode correspond to different electrolyte volume fraction in pore space of electrode. The model is then used to investigate the effect of wetting area in carbon paper electrode on the performance of vanadium redox flow battery. It is found that the electrochemical performance of positive half cell is reduced with air bubbles trapped inside the electrode.
Publication Date: 1-Sep-2018
Date of Acceptance: 6-Jul-2018
URI: http://hdl.handle.net/10044/1/63393
DOI: https://dx.doi.org/10.1016/j.electacta.2018.07.027
ISSN: 0013-4686
Publisher: Elsevier
Start Page: 1806
End Page: 1819
Journal / Book Title: Electrochimica Acta
Volume: 283
Copyright Statement: © 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Physical Sciences
Electrochemistry
Vanadium redox flow battery
Lattice Boltzmann method
Pore scale
Micro-CT tomography
Wetting surface area
GRAPHITE FELT ELECTRODE
GAS-DIFFUSION LAYERS
PORE-SCALE
FUEL-CELL
ENERGY-STORAGE
DENSITY RATIO
SIMULATION
TRANSPORT
SURFACE
MODEL
Science & Technology
Physical Sciences
Electrochemistry
Vanadium redox flow battery
Lattice Boltzmann method
Pore scale
Micro-CT tomography
Wetting surface area
GRAPHITE FELT ELECTRODE
GAS-DIFFUSION LAYERS
PORE-SCALE
FUEL-CELL
ENERGY-STORAGE
DENSITY RATIO
SIMULATION
TRANSPORT
SURFACE
MODEL
03 Chemical Sciences
09 Engineering
02 Physical Sciences
Energy
Publication Status: Published
Embargo Date: 2019-07-11
Online Publication Date: 2018-07-11
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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