聚合物电解质膜电解
限制
电流(流体)
电解
限制电流
热力学
材料科学
环境科学
化学
机械
电化学
物理
电极
电解质
机械工程
物理化学
工程类
作者
Songsong Ma,Linjun Li,Ryuta Kohama,Hironori Nakajima,Kohei Ito
标识
DOI:10.1016/j.ijhydene.2024.05.345
摘要
Operation at high current density of polymer electrolyte membrane electrolysis cell (PEMEC) can reduce its electrode area and capital expense. The high current density operation is limited by the limiting current density (LCD), where electrolysis voltage abruptly increases. Effects of operating temperature and pressure on the LCD were evaluated in a lab-scale PEMEC within a range from 70 to 90 °C and from 0.1 to 0.3 MPa. Also, a theoretical model was developed to predict the LCD, and to clarify what determines LCD and how the operating conditions influence the LCD. The theoretical analysis suggests that when current density is close to the LCD, water mass transport at anode reaches a limitation, which indicates that water saturation reaches almost zero at anodic catalyst layer. The analysis also finds that lower operating temperature and higher operating pressure can reduce oxygen gas saturation and raise the water saturation in porous transport layer at anode, and finally enlarge the LCD.
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