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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 157-162 |
| Number of pages | 6 |
| Journal | Journal of Applied Electrochemistry |
| Volume | 20 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1990 |
| Externally published | Yes |
ASJC Scopus subject areas
- General Chemical Engineering
- Electrochemistry
- Materials Chemistry