Mécanismes de vieillissement de l'Assemblage-Membrane-Électrodes dans une pile à combustible de type PEM par approche expérimentale

Abstract : This thesis highlights the aging mechanisms of PEM Fuel Cell submitted to two main aging conditions: air relative humidity (RH) cycling, and MEA (Membrane Electrode Assembly) pinhole test of operation. First, the aging mechanisms of PEMFC main components (membrane, catalyst, carbon support, GDL, bipolar plates and gaskets), have been reviewed from the literature. Then the on-line diagnostic tools (chronopotentiometry, electrochemical impedance spectroscopy, water management and water analysis), off-line ones (cyclic voltammetry and linear sweep voltammetry) and post-mortem analyses (nuclear magnetic resonance, transmission electron microscopy, scanning electron microscopy and X-ray diffraction) have been described. Experimentally, the high and low air RH cycling runs have been carried out with a 25 cm2 single cell: the high air RH cycling run promoted serious loss of the ElectroChemical Surface Area (ECSA); the low air RH cycling run caused significant increase in hydrogen crossover. The low air RH cycling has been also performed with a 100 cm2 single cell and the aging mechanism was different from that of 25 cm2 cell: the hydrogen crossover remained very low but the fuel cell voltage exhibited strong fluctuations at the end of the run: this was attributed to the presence of dead volumes and liquid water retention within the cell. Finally, MEA pinhole effect has been investigated with a 100 cm2 single cell: the perforation by a 0.7 mm diameter pin promoted slight increase in the hydrogen crossover; the perforation by a 1.2 mm diameter pin caused significant cell voltage losses and serious increase in the cathode diffusion resistance due to significant hydrogen crossover
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Botao Huang. Mécanismes de vieillissement de l'Assemblage-Membrane-Électrodes dans une pile à combustible de type PEM par approche expérimentale. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0268⟩. ⟨tel-01749462⟩

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