Mathematical Model and Working Characteristics Analysis of Alkaline Electrolyzer

Hydrogen production from renewable energy has become an effective way to improve the utilization rate of renewable energy. In order to deeply tap the flexible regulation ability of hydrogen production system, a semi empirical mathematical model of alkaline electrolyzer is established in this paper, including voltage model, Faraday efficiency model, hydrogen production model and energy efficiency model. According to the mathematical model of alkaline electrolyzer, the working characteristics of alkaline electrolyzer cell are simulated by MATLAB simulation software. The simulation results show that the U-I characteristics and efficiency characteristics of electrolyzer are sensitive to temperature change, while Faraday efficiency and hydrogen production are not sensitive to temperature change. Since increasing the temperature can reduce the polarization overvoltage of the electrolyzer and reduce the loss caused by polarization overvoltage, increasing the temperature can improve the performance of alkaline electrolyzer.