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Characterization of a regenerative hydrogen-vanadium fuel cell using an experimentally validated unit cell model

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Pino-Muñoz_2019_J._Electrochem._Soc._166_A3511.pdfPublished version2.43 MBAdobe PDFView/Open
Title: Characterization of a regenerative hydrogen-vanadium fuel cell using an experimentally validated unit cell model
Authors: Pino-Munoz, CA
Chakrabarti, BK
Yufit, V
Brandon, NP
Item Type: Journal Article
Abstract: A hydrogen-vanadium electrochemical system was characterized using extensive experimental tests at different current densities and flow rates of vanadium electrolyte. The maximum peak power density achieved was 2840 W m− 2 along with a limiting current density of over 4200 A m− 2. The cycling performance presented a stable coulombic efficiency over 51 cycles with a mean value of 99.8%, while the voltage efficiency decreased slowly over time from a value of 90.3% to 87.0%. The capacity loss was of 5.6 A s per cycle, which could be related to crossover of ionic species and liquid water. A unit cell model, previously proposed by the authors, was modified to include the effect of species crossover and used to predict the cell potential. Reasonable agreement between the model simulations and the experimental charge-discharge data was observed, with Normalized Root-Mean-Square Errors (NRMSEs) within the range of 0.8–5.3% and 2.9–19.0% for charge and discharge, respectively. Also, a good degree of accuracy was observed in the simulated trend of the polarization and power density, with NRMSEs of 3.1% and 1.0%, and 1.1% and 1.9%, for the operation at a flow rate of vanadium electrolyte of 100 and 50 mL min− 1, respectively, while the voltage efficiency during the cycling test were estimated within a Root-Mean-Square Error (RMSE) of 1.9%. A study of the effect of the component properties on the cell potential was carried out by means of a model sensitivity analysis. The cell potential was sensitive to the cathodic transfer coefficient and the cathode porosity, which are directly related to the cathodic overpotential through the Butler-Volmer equation and the cathodic ohmic overpotential. It was recognized that a kinetic study for the cathodic reaction is needed to obtain more reliable kinetic parameters at practical vanadium concentrations, as well as reliable microstructural parameters of carbon electrodes.
Issue Date: 17-Oct-2019
Date of Acceptance: 1-Jan-2019
URI: http://hdl.handle.net/10044/1/78103
DOI: 10.1149/2.0211914jes
ISSN: 0013-4651
Publisher: Electrochemical Society
Start Page: A3511
End Page: A3524
Journal / Book Title: Journal of The Electrochemical Society
Volume: 166
Issue: 15
Copyright Statement: © The Author(s) 2019. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.
Keywords: Science & Technology
Physical Sciences
Technology
Electrochemistry
Materials Science, Coatings & Films
Materials Science
REDOX-FLOW BATTERY
ENERGY-STORAGE
PERFORMANCE
SIMULATION
ELECTRODES
DERIVATION
DIFFUSION
TRANSPORT
Science & Technology
Physical Sciences
Technology
Electrochemistry
Materials Science, Coatings & Films
Materials Science
REDOX-FLOW BATTERY
ENERGY-STORAGE
PERFORMANCE
SIMULATION
ELECTRODES
DERIVATION
DIFFUSION
TRANSPORT
Energy
0303 Macromolecular and Materials Chemistry
0306 Physical Chemistry (incl. Structural)
0912 Materials Engineering
Publication Status: Published
Open Access location: https://iopscience.iop.org/article/10.1149/2.0211914jes
Online Publication Date: 2019-01-01
Appears in Collections:Earth Science and Engineering
Grantham Institute for Climate Change