Effects of Humidification on the Membrane Electrode Assembly of Proton Exchange Membrane Fuel Cells at Relatively High Cell Temperatures
作者： K.-M. Yin , C.-P. Chang
关键词: Analytical chemistry 、 Dielectric spectroscopy 、 Cathode 、 Chemistry 、 Proton exchange membrane fuel cell 、 Nernst equation 、 Oxygen transport 、 Polarization (electrochemistry) 、 Membrane electrode assembly 、 Electrolyte
摘要: This study focuses on the performances of proton exchange membrane fuel cells (PEMFCs) at 80 and 90 °C with feeds varying degrees humidification. The results show that ohmic resistance solid electrolyte decreases as current density is raised because back diffusion liquid water, is, generated in cathode active layer. On other hand, severe water accumulation occurs high densities, which hinders oxygen transport gas layer (GDL) resulting Nernst limitation. polarization measurement correlates well electrochemical impedance spectroscopy (EIS) analysis. effects humidification hydration, activity catalyst layer, over-potential GDL are elucidated proposed equivalent circuit model operating densities.
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