| 초록 |
Poly(arylene ether ketone) was synthesized in a variety of chemical structure for the application in fuel cell electrolyte membranes. Ce3+ ion was introduced along with 18-crown-6-ether to the membranes in order to enhance the anti-oxidation property of the membranes, as it quenches the hydroxyl radicals, the major oxidation promoter, in fuel cell operation. The chemical and physical structures of the composite membranes were investigated usingFTIR,1H-NMR, SEM, EDX, and SAXS. According to Fenton's test, the pristine sPEEK membrane was completely degraded by oxidation in 24h but the composite membranes containing Ce3+/18-crown-6-ether complex was stable up to 70 h without any degradation. As the concentration of Ce3+ ions increased, the ion cluster dimension of the membranes decreased and thus reduced the proton conductivity. Other properties such as thermal and mechanical stability and water uptake were not noticeably affected at the low concentration of Ce3+ up to 2 mole % based on sulfonic acid groups. |
