| 초록 |
Nafion, a perfluorosulfonate ionomer, is the major membrane material used in polymer electrolyte membrane fuel cells (PEMFC). However, the Nafion membrane is a poor barrier to methanol crossover. In this study, Nafion 117 membranes were modified with a thin film of sulfonated polyaniline(sPANI) by a diffusion-controlled enzymatic polymerization process using a two compartment cell with the monomer aniline-2-sulfonic acid on one side of the membrane and the oxidizing agent H2O2 and, horseradish peroxidase(HRP) on the other side. The performance of the modified membranes were evaluated in terms of methanol permeability, proton conductivity and single cell performance. Compared with Nafion 117 membranes, the methanol permeability of the modified membranes is reduced remarkably while proton conductivity is comparable. Effects of the polymerization condition on the performance of the modified membrane were also examined. |
