20.500.12556/RUL-177813 Understanding water management and cathode performance in LT-PEMFCs via EIS and DRT diagnostics Low-Temperature Proton Exchange Membrane Fuel Cells (LT-PEMFCs) are key to sustainable energy technologies, but their performance is highly dependent on cathode operating conditions and membrane hydration. This study employs Electrochemical Impedance Spectroscopy (EIS) and the Distribution of Relaxation Times (DRT) to analyze the effects of cathode stoichiometry, temperature, cathode feed composition, and hydration levels on key electrochemical processes. The findings highlight the impact of operational parameters on oxygen reduction reaction (ORR) kinetics, proton transport, and mass transport resistance. DRT analysis identifies flooding and membrane drying as dominant performance-limiting phenomena. Pure oxygen feed mitigates mass transport limitations, while variations in air stoichiometry and temperature influence charge transfer resistance and proton conductivity. This study enhances understanding of LT-PEMFC behavior under diverse conditions and provides insights for optimizing performance and durability. The results provide diagnostic features and fundamental insights that can guide the development of future diagnostic frameworks for improved fuel cell control, enhanced water management strategies, and long-term operational stability. low-temperature proton exchange membrane fuel cell LT-PEMFC electrochemical impedance spectroscopy EIS distribution of relaxation times analysis DRT fuel cell performance diagnostics nizkotemperaturne gorivne celice protonske izmenjevalne membrane elektrokemična impedančna spektroskopija analiza porazdelitev relaksacijskih časov diagnostika delovanja true false true Angleški jezik Slovenski jezik Članek v reviji 2026-01-08 10:57:33 2026-01-08 10:57:39 2026-01-09 04:30:04 0000-00-00 00:00:00 2026 0 0 23 str. Vol. 15, art. 109024 2026 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 0000-00-00 621.352.6:543.42 2352-4847 10.1016/j.egyr.2025.109024 263908355 Todorovski_...._Understanding_water_...pdf Todorovski_...._Understanding_water_...pdf 1 64BE565BD95536039503E153AEFAD995 f774931e6408b6585789f3a58176de0c587bdb56a1c8a9d0365b62864c23a8b5 b1f1aade-ec78-11f0-bf92-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=225147 https://www.sciencedirect.com/science/article/pii/S235248472500900X 1 768c4356-ec78-11f0-bf92-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=225146 Fakulteta za strojništvo 0 0 0