气泡
机械
入口
半径
电解
电流(流体)
极化(电化学)
电流密度
质子交换膜燃料电池
材料科学
化学
热力学
电极
电解质
物理
膜
机械工程
量子力学
工程类
物理化学
生物化学
计算机安全
计算机科学
作者
Xin Su,Liang Xu,Bing Hu
标识
DOI:10.1016/j.ijhydene.2022.04.154
摘要
The bubble covering phenomenon has been considered one of the most critical factors affecting Proton Exchange Membrane Electrolysis Cell (PEMEC) at high current densities. However, the relationship between bubble dynamics and electrochemistry has not been clearly defined. This study analyzes the bubble coverage and PEMEC performance under different input conditions and develops a mathematical model of PEMEC incorporating bubble dynamics. The model successfully predicted the polarization curves and coincided with the experimental data. The results show that bubble coverage increases with increasing current density, bubble detachment radius, and temperature. It decreases with increasing pressure and water inlet velocity. Bubble coverage is influenced by temperature, pressure, wettability, current density, and water inlet velocity. Meanwhile, bubbles covering the electrode deteriorate the performance of the PEMEC, leading to higher overpotentials and lower efficiencies, which becomes more apparent with increasing current density. This paper elucidates the relationship between bubble growth/detachment, bubble coverage, and electrochemistry for the first time, and the results can provide a reference for the development and optimization of high-performance PEMEC.
科研通智能强力驱动
Strongly Powered by AbleSci AI