| 초록 |
In polymer electrolyte membrane fuel cells (PEMFCs), Nafion membranes are generally used as they possess high ionic conductivity along with good mechanical properties. A PEMFC is normally operated below 80℃ under fully hydrated conditions. However, Nafion membranes cannot be used at higher temperatures (＞80℃) as the ionic conductivity is strongly dependent on humidity, and an increase in temperature above 80℃ leads to a loss in fuel cell performance due to a drastic decrease in ionic conductivity by the loss of water by evaporation. In this study, chemical structure and morphology of Nafion membranes were investigated before and after high temperature aging. The differences between aging were investigated by FT-IR, AFM, XPS, TEM and TGA. Detailed results will be presented. |
