술폰화된 poly(fluorenyl ether nitrile oxynaphthalate)를 기반으로 한 수소 이온 전도성 복합막의 합성 및 전기화학적 특성

Abstract

A series of sulfonated poly(fluorenyl ether nitrile oxynaphthalate) (SPFENO) copolymers with different degree of sulfonation (DS) are synthesized via nucleophilic polycondensation reactions with commercially available monomers. Incorporation of the naphthalanesulfonate group into the copolymers and their copolymer structures are confirmed by 1H-NMR spectroscopy. Thermal stability, mechanical properties, water uptake, swelling behavior, proton conductivity and methanol permeability of the SPFENO membranes are investigated with respect to their structures. In addition, the core-shell structured SiO2 particles were synthesized and introduced into the SPFENO membranes with various contents of core-shell structured silica particles in order to improve properties of membranes. The electrochemical performance of a direct methanol fuel cell (DMFC) assembled with the SPFENO membrane and SPFENO composite membranes was evaluated and compared to a DMFC with a Nafion 117 membrane. The DMFC assembled with the SPFENO membrane of proper DS and SPFENO composite membranes exhibits better electrochemical performance compared to the Nafion 117-based cell.