| Summary: | 碩士 === 元智大學 === 機械工程學系 === 98 === Proton exchange membrane fuel cell has widely application. It can be used on set-type power generator, and also can be used on automotive applications. It will affect the lifetime of MEA in fuel cell at different applications and conditions. It makes a stable output in Steady-state load, therefore it needs a long time procedure to degradation. But the dynamic load accompany with a lot of kinds of effect, which accelerated the effects of degradation in short time. And comprehend the relationship between MEA’s lifetime with steady-state and dynamic load. This paper used a dynamic load as a way for accelerated degradation. And consider the general use of fuel cell, using low humidify, low flow rate as the experimental conditions. The experiment use high-frequency and low frequency dynamic load achieve 100 hours of degradation test. During the load period, use the polarization curves, open circuit voltage measurement, AC impedance, cyclic voltammetry measurement, linear sweep voltammetry measurement and Transmission Electron Microscopy to find out the degradation phenomenon.
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