Deterioration of Nafion 115 membrane in direct methanol fuel cells
Source abstract
Abstract
Abstract 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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fuel Cells and Related Materials · Electrocatalysts for Energy Conversion · Membrane-based Ion Separation Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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