Effects of temperature and pressure on the limiting current density of PEM electrolysis cells based on a theoretical prediction model and experiments

• DOI: 10.1016/j.ijhydene.2024.05.345
• Publication Date: 2024-05-27T13:33:46Z
• Authors: Songsong Ma; Linjun Li; Ryuta Kohama; Hironori Nakajima; Kohei Ito
• Keywords: Limiting current; Saturation (graph theory); Electrolysis of water

Operation at high current density of polymer electrolyte membrane electrolysis cell (PEMEC) can reduce its electrode area and capital expense. The operation is limited by the limiting (LCD), where voltage abruptly increases. Effects operating temperature pressure on LCD were evaluated in a lab-scale PEMEC within range from 70 to 90 °C 0.1 0.3 MPa. Also, theoretical model was developed predict LCD, clarify what determines how conditions influence LCD. analysis suggests that when close water mass transport anode reaches limitation, which indicates saturation almost zero anodic catalyst layer. also finds lower higher oxygen gas raise porous layer anode, finally enlarge