气泡
两相流
流量(数学)
电解质
机械
计算机模拟
相(物质)
材料科学
环境科学
物理
电极
量子力学
作者
Jinpeng Li,Hongwei Liang,Mirza Abdullah Rehan,Guiqiang Li
标识
DOI:10.1016/j.applthermaleng.2024.122890
摘要
The electrolysis of water to produce hydrogen is thought to be one of the most promising strategies to achieve carbon neutrality. However, the evolution of bubbles causes possible hindrances to its mass mobility between electrolytic solution and catalyst because they envelop the catalyst surface, which ultimately leads to a reduction in conversion efficiency. At present, the correlation between vigorous bubble evolution and electrolytic water performance has not been thoroughly investigated. Therefore, to quantitatively analyze this correlation, this work constructs an integrated model of the alkaline electrolytic cell based on COMSOL software that considers the effect of bubble coverage. The results show that increasing the bubble contact angle facilitates the generation and separation of bubbles and can decrease bubble coverage's effect on the electrolytic cell's current density at the same voltage. The current density can increase from 850 A/m2 to 1100 A/m2 with an increase in bubble contact angles from 90° to 140° at an electrolytic cell voltage of 1.83 V. In addition, although increasing the operating temperature (50–80 °C) enhances the negative effects due to bubble coverage, increasing the temperature still can increase the hydrogen production efficiency. Therefore, it can be believed that the work in this paper may guide the development and utilization of alkaline electrolytic cells.
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