| 초록 |
This study is to prepare and characterize ZrO2-SiO2/Nafion® composite membranes for polymer electrolyte membrane fuel cells (PEMFCs) operation at high temperature above 100 ℃. The ZrO2-SiO2 binary oxide of fine particle was synthesized by sol-gel technique. The composite membranes were prepared by mixing a 10% (w/w) Nafion®-water dispersion with the inorganic compound using the Doctor-Blade casting method. From FT-IR spectrums, oxygen linkages between Zr and Si (Zr-O-Si) of the binary oxide were verified. Water uptake and proton conductivity of the composite membrane were increased with increasing the content of silicon and zircon in the binary oxide, respectively. Moreover, the composite membranes were tested in a 9 cm2 commercial single cell at 80 °C, 1 atm and 120 °C, 2 atm under H2/air of different relative humidity (RH). The performances of the single cells for composite membranes were better than that of the Nafion® at the same condition. |
