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Transport in PEMFC | 7/14 | UPV

Título: Transport in PEMFC Descripción: El objetivo es comprender los fenómenos de transporte que tienen lugar en las membranas utilizadas en PEMFC Ribes Greus, MD. (2010). Transport in PEMFC. http://hdl.handle.net/10251/8161 Descripción automática: In this video, the speaker provides an overview of transport mechanisms in proton exchange membrane fuel cells (PEMFCs) and the importance of these processes for the cell's efficiency. They discuss how hydrogen, which acts as fuel, is oxidized at the anode to produce protons and electrons. While electrons create an external electric current, protons move through the electrolyte to the cathode, where they combine with oxygen to form water. The video emphasizes the central role of proton transport through the electrolyte, detailing that any delay in this process can slow down the entire power generation cycle. Consequently, understanding and optimizing the electrolyte's structure is critical to improving fuel cell performance. The speaker mentions Nafion as the most commonly used membrane, highlighting its perfluorinated structure with ionic groups that facilitate proton exchange. Two key proton transport mechanisms are explained: the Grotthuss mechanism, which involves the movement of protons via hydrogen bonds, and the vehicle mechanism, in which protons hitch a ride with water molecules. Both mechanisms are crucial for the membrane's function, which should separate gas flows and maintain high water content without permitting gas crossover. Finally, the presentation underscores the need for ongoing research to enhance proton transport within PEMFCs. The speaker calls for meticulous studies to discriminate between the different mechanisms—hydrogen bonds and vehicle mechanisms—to boost efficiency. The objective is to ensure high proton conductivity and water retention while preventing gas permeability, aiding in the design of effective fuel cells. Autor/a: PoliMedia Administrador Curso: Este vídeo es el 7/14 del curso Introduction to Fuel Cells Course | Universitat Politècnica de València (UPV).    • Introduction to Fuel Cells Course | U...   Universitat Politècnica de València UPV: https://www.upv.es Más vídeos en:    / valenciaupv   Accede a nuestros MOOC: https://upvx.es #Fuel cells #Power generation #Renewable energy sources #Transport #MAQUINAS Y MOTORES TERMICOS