| 초록 |
In this paper, we modified Nafion by means of chemical in-situ polymerization of Pt-anchored pyrrole monomers for fuel cell membrane. After polymerization, nanoparticles of ca. 40-80 nm were dispersed. XPS and FT-IR was used to characterize the modified membranes, demonstrating that positively pyrrole monomers played a role of linking Nafion with Pt precursor via mutual interaction. To confirm potential for application in Fuel cells, thermal stability, proton conductivity, methanol permeability, water uptake, and cell performance were measured. After modification, Nafion/Pt/Ppy had higher thermal stabilities of sulfonic groups and side chains than Nafion and Nafion/Ppy. Proton conductivity of Nafion/Pt-Ppy was always lower than that of Nafion at room temperature, while proton conductivities of Nafion/Pt/Ppy had comparable to or higher than that of Nafion above 100 oC. Nafion/Pt/Ppy had higher performance than Nafion in DMFC operation owing to reduction of methanol crossover. |
