| 초록 |
The crucial problem to higher efficiency of direct methanol fuel cells (DMFCs) is methanol crossover of Nafion® membrane. α-Zirconium phosphate (α-ZrP) has been introduced to reduce the methanol crossover of Nafion. Exfoliated α-ZrP can be obtained with ultra-sonication and basic surfactant (tetrabutylammonium hydroxide, TBA+OH-). Polyallylamine is used to render ionic bonding with α-ZrP and Nafion. A novel α-ZrP/Nafion nanocomposite electrolyte membrane was fabricated by coating the α-ZrP/Nafion solution on Nafion® 117 membrane. By using X-ray diffraction (XRD) and transmission electron microscopy (TEM), it was found that α-ZrP was well-dispersed in Nafion matrix. Scanning electron microscopy (SEM) measurements indicated that the nanocomposite layers have uniform thickness and good adhesion with Nafion® 117 membrane. There was a significant decreases in methanol permeability of the nanocomposite electrolyte membrane compared with Nafion® 117 membrane, while the proton conductivity of that was slightly less than that for Nafion® 117 membrane. |
