流动电池
钒
氢
电解质
传质
化学
氧化还原
热力学
气泡
电池(电)
电化学
电极
分析化学(期刊)
机械
无机化学
色谱法
物理
物理化学
有机化学
功率(物理)
作者
Akeel A. Shah,H. Al-Fetlawi,Frank C. Walsh
标识
DOI:10.1016/j.electacta.2009.10.022
摘要
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.
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