Dual sulfonated poly(arylene ether ketone) membrane grafted with 15-crown-5-ether for enhanced proton conductivity and anti-oxidation stability
발표자
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초록
내용
In PEMFC, durability is recently the critical issue in cell operation. As cerium ion (Ce+3) is a potential scavenger of ∙OH and ∙OOH radicals, the main causes of the chemical degradation of the membrane, aminomethyl-15-crown-5-ether (CRE) and dual sulfonated functional group were grafted onto the PAEK in order to alleviate its migration and proton conductivity reduction effects. The chemical and physical structures of the synthesized CRE grafted dual sulfonated PAEK membrane (CRE-DSPAEK) and the coordination complex of CRE and Ce ions were investigated using FT-IR, 1H-NMR and SAXs, and XPS spectroscopy. Fenton’s test showed the huge improvement of anti-oxidation stability by the presence of CRE, and its effect on the anti-migration of Ce+3 was confirmed by monitoring its residual amount inside the membrane. While the CRE/Ce coordinated membrane showed higher proton conductivity than the Ce+3 dispersed one along with the considerable chemical stability enhancement.