期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 19, 期 7, 页码 2053-2061出版社
SPRINGER
DOI: 10.1007/s10008-014-2701-y
关键词
LDH; Nanoclay; Composite Nafion membrane; Methanol crossover; Direct methanol fuel cell; NMR
资金
- PRIN project Advanced nanocomposite membranes and innovative electro-catalysts for durable polymer electrolyte membrane fuel cells (NAMED-PEM)
Composite 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 degrees 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 H-1 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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