Xia Ye, Gao Mengyu, Yu Jincheng, Si Yang, Chen Laijun, Mei Shengwei
New Energy (Photovoltaic) Industry Research Center, Qinghai University, Xining 810016, China.
State Key Laboratory of Control and Simulation of Power System and Power Generation Equipment, Electric Machinery Department, Tsinghua University, Beijing 100084, China.
Materials (Basel). 2022 Jul 15;15(14):4927. doi: 10.3390/ma15144927.
This study constructed a two-dimensional alkaline water electrolyzer model based on the two-phase flow Euler-Euler model. In the model, the micro-nano surface electrodes with different structure types and graphic parameters (distance, height, and width) were used and compared with the vertical flat electrode to evaluate their influence on electrolysis performance. The simulation results show that the performance of the micro-nano surface electrode is much better than that of the vertical flat electrode. The total length of micro-nano structural units relates to the contact area between the electrode and the electrolyte and affects the cell voltage, overpotential, and void fraction. When rectangular structural units with a distance, height, and width of 0.5 µm, 0.5 µm, and 1 µm are used, the total length of the corresponding micro-nano surface electrode is three times that of the vertical flat electrode, and the cathode overpotential decreases by 65.31% and the void fraction increases by 54.53% when it replaces the vertical flat electrode.
本研究基于两相流欧拉 - 欧拉模型构建了二维碱性水电解槽模型。在该模型中，使用了具有不同结构类型和图形参数（间距、高度和宽度）的微纳表面电极，并与垂直平板电极进行比较，以评估它们对电解性能的影响。模拟结果表明，微纳表面电极的性能远优于垂直平板电极。微纳结构单元的总长度与电极和电解质之间的接触面积有关，并影响电池电压、过电位和空隙率。当使用间距、高度和宽度分别为0.5 µm、0.5 µm和1 µm的矩形结构单元时，相应微纳表面电极的总长度是垂直平板电极的三倍，当它取代垂直平板电极时，阴极过电位降低了65.31%，空隙率增加了54.53%。
