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EnglishComposite membranes based on Nafion with the inclusion of cationic and anionic nanoclays, Laponite, and layered double hydroxide (LDH), respectively, were used to increase the operating temperature of a direct methanol fuel cell (DMFC). The electrochemical behavior of the hybrid nanocomposites was investigated in a single cell at different temperatures (from 90 to 110 °C), and the results were compared with those obtained on the filler-free Nafion membrane. Cell resistance measurements showed a significant improvement of the water retention capability at intermediate temperature for the composite membranes, in particular the LDH-based one. This feature was investigated and explained by a thorough NMR study (diffusometry, relaxometry, and 1H spectral analysis) on the different membranes. Furthermore, the dispersion of 2D plate-like nanolayers in the polymeric matrix demonstrates to be a physical barrier, considerably reducing the methanol mobility through an increase of the tortuosity of the diffusional paths of methanol molecules
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| Titolo: | Methanol and Proton Transport in Layered Double Hydroxide and Smectite Clay based-Composites: Influence on the Electrochemical Behavior of Direct Methanol Fuel Cells at Intermediate Temperatures |
| Autori: | |
| Data di pubblicazione: | 2015 |
| Rivista: | |
| Handle: | http://hdl.handle.net/20.500.11770/157663 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/20.500.11770/157663
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