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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
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Official URL: http://dx.doi.org/10.1016/j.electacta.2009.10.022
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 | ||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology |
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| Divisions: | Faculty of Science > Engineering | ||||
| Journal or Publication Title: | Electrochimica Acta | ||||
| Publisher: | Pergamon | ||||
| ISSN: | 0013-4686 | ||||
| Official Date: | 1 January 2010 | ||||
| Dates: |
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| 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 |
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