20.500.12556/RUL-148318 Elucidating mechanistic background of the origin and rates of peroxide formation in low temperature proton exchange fuel cells Degradation of electrode-membrane assembly of the low-temperature hydrogen fuel cells represents one of the main obstacles in wider adoption of these clean and efficient electrochemical sources of electrical energy. Chemical degradation of proton exchange membrane is initiated by hydrogen peroxide formation, which forms in the fuel cell as a byproduct to water in oxygen reduction reaction and decomposes to reactive radical species, damaging to the membrane chemical structure. Depending on the operating conditions of the fuel cell, the source of hydrogen peroxide can be either cathode, anode, or, as we argue in the paper, also the Pt particles in the membrane, which originate from the cathode catalyst dissolution, diffusion into the membrane and redeposition of Pt ions inside the membrane. In the paper we propose a mathematical model of intertwined physical processes in membrane and catalyst layer, aimed at unifying the description of hydrogen peroxide formation throughout entire membrane-electrode assembly at any fuel cell operating conditions. The model results, compared to experimental data, indicate that Pt particles inside the membrane can indeed be an important source of hydrogen peroxide in aged fuel cells. For a fresh fuel cell, numerical simulation using proposed model show that hydrogen peroxide can be formed at either cathode or anode, depending on the fuel cell operating condition, but with anode production being more prominent in standard fuel cell operating conditions. fuel cells membrane degradation hydrogen peroxide modelling gorivne celice membrane degradacija vodikov peroksid modeliranje true false true Angleški jezik Slovenski jezik Članek v reviji 2023-08-11 13:46:48 2023-08-11 13:46:50 2025-08-08 13:22:32 0000-00-00 00:00:00 2023 0 0 Str. 753-770 no. 5 Vol. 13 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.352.6 1847-9286 10.5599/jese.1659 161131267 Kregar,_Katrasnik_-_Elucidating_mechanistic_background_of_the_origin_and_rates_of_peroxide_formation_in_low_temperature_proton_exchange_fuel_cells.pdf Kregar,_Katrasnik_-_Elucidating_mechanistic_background_of_the_origin_and_rates_of_peroxide_formation_in_low_temperature_proton_exchange_fuel_cells.pdf 1 EDAE2C7E72744C7F1AD2F0F2CFFC5775 1a775e0c656302e4cc636febbf337adb986e59be05f03cf4222464dcbd2eab35 26463698-383e-11ee-b9d7-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172433 https://pub.iapchem.org/ojs/index.php/JESE/article/view/1659 1 c1c6034a-383c-11ee-b9d7-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172430 Fakulteta za strojništvo 0 0 0