Preparation of Nafion?/SBA-15 Composites as Proton Exchange Membranes and Their Applications in DMFC
Date Issued
2016
Date
2016
Author(s)
Wang, Yueh-Chu
Abstract
Direct methanol fuel cell (DMFC) is considered a promising power supplier for various applications because of its high theoretical energy density of methanol, low emission, and moderate operation temperature. null Generally, a high selective membrane with high proton conductivity and low methanol crossover is suitable for DMFC. Commercialized Nafion® exhibits high chemical stability and proton conductivity, but suffers high methanol crossover which leads to decrease of cell voltage and lifetime. null In the present study, mesoporous SBA-15 silica was used as the additive of Nafion membrane. Mesoporous silica SBA-15 of different morphologies with and without surfactant are synthesized then imbedded into the Nafion® membrane by solvent-recasting procedure using N,N’-dimethylacetamide (DMAc) and 2-propanol (iPA) as the solvents. null Pore directing agent of SBA-15, P123, can serve as nonaqueous proton transporter which may assist proton conductivity of composite membrane. null The additive materials were characterized with powder-XRD, N2 sorption, and SEM. The characteristics of composite membranes prepared by solvent recasting procedure were examined with thickness from spiral micrometer, methanol permeability, proton conductivity, selectivity, and single cell performance test.
Subjects
Direct methanol fuel cell (DMFC)
Proton exchange membrane (PEM)
composite membrane
SDGs
Type
thesis
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