화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.12, No.4, 413-421, August, 2004
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Preparation and Characterization of Sulfonated Poly(phthalazinone ether sulfone ketone) (SPPESK)/Silica Hybrid Membranes for Direct Methanol Fuel Cell Applications
Dae Sik Kim, Kwang Ho Shin, Ho Bum Park, and Young Moo Lee†
  • National Research Laboratory for Membranes, School of Chemical Engineering,College of Engineering, Hanyang University, Seoul 133-791, Korea
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Sulfonated poly(phthalazinone ether sulfone ketone) (SPPESK) membranes and sol-gel derived SPPESK/silica hybrid membranes have been investigated as potential polymer electrolyte membranes for direct methanol fuel cell (DMFC) applications. In comparison with the SPPESK membrane, the SPPESK/silica membranes exhibited higher water content, improved proton conductivity, and lower methanol permeability. Notably, the silica embedded in the membrane acted as a material for reducing the fraction of free water and as a barrier for methanol transport through the membrane. From the results of proton conductivity and methanol permeability studies, we suggest that the fractions of bound and free water should be optimized to obtain desirable proton conductivities and methanol permeabilities. The highly sulfonated PPESK hybrid membrane (HSP-Si) displayed higher proton conductivity (3.42 × 102 S/cm) and lower methanol permeability (4.15 × 107 cm2/s) than those of Nafion 117 (2.54 × 102 S/cm; 2.36 × 106 cm2/s, respectively) at 30 °C. This characteristic of the SPPESK/silica membranes is desirable for future applications related to DMFCs.
Keywords:sulfonated poly(phthalazinone ether sulfone ketone) (SPPESK);silica;proton conductivity;methanol permeability;hybrid membrane
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