Diagnosis and Accelerated Test of Composite Membrane Degradation in High Temperature PEM Fuel Cell

• Main Authors: Chung-Cheng Chi, 紀宗成
• Other Authors: Ay Su
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/03492709271686984577

碩士 === 元智大學 === 機械工程學系 === 96 === Home made Nafion composite membranes were studied for long-term operation under constant current mode at 120℃ as a control. The same MEA was also aged under cyclic humidity and current loading conditions. The stability, durability and degradation behavior of the composite membrane is investigated in detail by using “In-situ”and “Ex-situ”diagnostics. Electrochemical test methods (linear sweep voltammetry, cyclic voltammetry and polarization curves) and AC impedance analysis were performed as diagnostic tools to understand materials changes occurring during accelerated aging test. Post mortem analyses like scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD) were also performed to verify the material structure degradation mechanism.