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Dynamic modelling of hydrogen evolution effects in the all-vanadium redox flow battery

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Shah, Akeel A., Al-Fetlawi, H. and Walsh, F. C. (2010) Dynamic modelling of hydrogen evolution effects in the all-vanadium redox flow battery. Electrochimica Acta, Vol.55 (No.3). pp. 1125-1139. doi:10.1016/j.electacta.2009.10.022 ISSN 0013-4686.

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Official URL: http://dx.doi.org/10.1016/j.electacta.2009.10.022

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Abstract

A model for hydrogen evolution in an all-vanadium redox flow battery is developed, coupling the dynamic conservation equations for charge, mass and momentum with a detailed description of the electrochemical reactions. Bubble formation at the negative electrode is included in the model, taking into account the attendant reduction in the liquid volume and the transfer of momentum between the gas and liquid phases, using a modified multiphase-mixture approach. Numerical simulations are compared to experimental data for different vanadium concentrations and mean linear electrolyte flow rates, demonstrating good agreement. Comparisons to simulations with negligible hydrogen evolution demonstrate the effect of gas evolution on the efficiency of the battery. The effects of reactant concentration, flow rate, applied current density and gas bubble diameter on hydrogen evolution are investigated. Significant variations in the gas volume fraction and the bubble velocity are predicted, depending on the operating conditions.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: Electrochimica Acta
Publisher: Pergamon
ISSN: 0013-4686
Official Date: 1 January 2010
Dates:
DateEvent
1 January 2010Published
Volume: Vol.55
Number: No.3
Number of Pages: 15
Page Range: pp. 1125-1139
DOI: 10.1016/j.electacta.2009.10.022
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Technology Strategy Board, UK, Re-Fuel Ltd and Scottish Power

Data sourced from Thomson Reuters' Web of Knowledge

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