Abstract
Infrared Reflectance Absorption Spectroscopy (IRRAS) has been used to study the thermal stability of Nafion (du Pont, equivalent weight=1100) and a similar perfluorinated sulphonic acid ionomer (PFSI) made by the Dow Chemical Company (equivalent weight=560). Purified aqueous PFSI electrolytes solutions were prepared, PFSI films (0.5–5 μm) were cast from these aqueous PFSI solutions onto Pt foil substrates for spectral study after heating at various temperatures. Spectra were recorded at room temperature in a vacuum after a film on Pt had been heated at a particular temperature in the presence of air. The temperature range was 22–300°C. Spectral changes for a PFSI film on Pt were not significant when heated at up to 200°C in an air atmosphere; however, when heated at 300°C there was a significant decrease in intensity for S-O related bands indicating substantial loss of the sulphonic acid groups from these ionomers.
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Chu, D., Gervasio, D., Razaq, M. et al. Infrared reflectance absorption spectroscopy (IRRAS). Study of the thermal stability of perfluorinated sulphonic acid ionomers on Pt. J Appl Electrochem 20, 157–162 (1990). https://doi.org/10.1007/BF01012486
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DOI: https://doi.org/10.1007/BF01012486