| 초록 |
Triazole is an effective proton conductor under anhydrous conditions and high temperature. The proton conduction in triazole at high temperatures results from the transfer of protons between neighboring protonated and unprotonated molecules. Since triazole is a small molecule, it may leach out gradually with time during fuel cell operation, which would lead to the decrease in proton conductivity and consequently fuel cell performance. Therefore, a proton conductive pathway is constructed by immobilizing benzotriazole-5-carboxylic acid into mesoporous silica SBA-15, dispersed in Nafion. The SBA-15 has mesoporous structure providing proton transfer channels, through which intermolecular proton transfer occurs between adjacent triazole groups, and exhibited a thermal stability up to 200 ℃. As the temperature increased up to 140°C, the proton conductivity was 8.52 X 10-4 S/cm at low humidity.(~10%). |
