کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1289719 | 973306 | 2009 | 8 صفحه PDF | دانلود رایگان |
A membrane electrode assembly (MEA) based on a Nafion 115 membrane shows a 29% loss in power density after continuous testing in a single direct methanol fuel cell for 1000 h at 50 °C. One of the main reasons for this behaviour is a deterioration of the membrane, namely, its ion-exchange capacity is reduced by 17%. The thermal decomposition behaviour of an untested and degraded membrane is studied by evolved gas analysis-mass spectrometry, pyrolysis-gas chromatography–mass spectrometry, thermo-gravimetric analysis, differential scanning calorimetry, and in situ FTIR reflectance absorption spectra. The results reveal a decrease in thermal stability of the degraded membrane. The Nafion 115 membrane is suggested to lose ion-exchange capacity after the sulfonic acid group is transformed to a thermally less-stable group, such as the persulfonic acid –SO2OOH group during MEA operation. The structural changes may prevent the formation of ionic clusters.
Journal: Journal of Power Sources - Volume 191, Issue 2, 15 June 2009, Pages 312–319