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Proton Conducting Membrane based on Crosslinked Sulfonated Polyimide for Direct Methanol Fuel Cell
성경아,김완근,오근환,주민주,박정기 한국전기화학회 2009 한국전기화학회지 Vol.12 No.3
Crosslinked membrane based on sulfonated polyimide was prepared by the introduction of crosslinkable monomer in polymerization process and crosslinking during membrane casting. Crosslinked membranes showed different properties from non-crosslinked membranes. Crosslinking decreased methanol crossover and therefore unit cell using crosslinked membrane showed increased open circuit voltage, 0.81 V, in comparison with unit cell using noncrosslinked membrane, 0.71 V. In addition, water uptake of crosslinked membrane, 40.5%, was lower than that of non-crosslinked membrane, 57.0%, and this resulted in improved dimensional stability. However, proton conductivity of crosslinked membranes showed rather low relative to non-crosslinked membrane due to reduced water uptake.
강홍석,남관우,소순용,오근환 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
In polymer electrolyte membrane fuel cell, the poor power performance of hydrocarbon (HC)-basedmembranes in low relative humidity conditions arises from the materials’ inherently inadequateproton conductivity under water-deficient conditions. In this study, we introduce boehmite into thecatalyst layer as a water retention material to enhance the power performance of a HC-basedmembrane/electrode assembly (MEA) in low RH conditions. The addition of well-dispersed boehmiteinto the CCL increased the water concentration and consequently accelerated water back diffusion tothe MEA at a low RH. The power performance also improved upon the addition of an optimal percentcontent of boehmite.