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Author

Lee, Sang-Young
Energy Soft-Materials Lab (ESML)
Research Interests
  • Soft Materials for Energy Storage/ Conversion Systems

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Effect of silane hydrophilicity on membrane transport properties of in-situ hybrid Nafion/organically modified silicate proton conductors for DMFC applications

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Title
Effect of silane hydrophilicity on membrane transport properties of in-situ hybrid Nafion/organically modified silicate proton conductors for DMFC applications
Author
So, Soon YongKim, Sung ChuLee, Sang-Young
Keywords
Direct methanol fuel cells; Hydrophilicity; In-situ hybridization; Nafion; Silane; Silicates
Issue Date
201006
Publisher
ELSEVIER SCIENCE BV
Citation
SOLID STATE IONICS, v.181, no.15-16, pp.714 - 718
Abstract
In order to build a better understanding of in-situ hybrid Nafion/ORMOSIL (Organically MOdified SILicates) membranes for DMFC (direct methanol fuel cells) applications, we investigate the effect of silane hydrophilicity on membrane transport properties of the hybrid proton conductors in terms of water-channel structure and state of water. The following three contrast silanes are introduced in the decreasing order of hydrophilicity: tetraethoxy silane (TEOS), methyl triethoxy silane (MTES), and diethoxy dimethyl silane (DEDMS). To focus exclusively on the silane hydrophilicity, a pre-requisite condition assuring that the same concentration of silanes should be immersed into Nafion115 is fulfilled by examining the silane diffusion behavior. As the silane hydrophilicity increases, the water-channel size and water uptake of the hybrid membranes become larger but the number of freezable water molecules decreases. Meanwhile, the hybrid membranes prepared from the hydrophobic silanes show the higher proton conductivity, leading to the superior selectivity. This interesting transport behavior is explained by considering the morphological change and state of water in the hybrid membranes.
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DOI
http://dx.doi.org/10.1016/j.ssi.2010.03.033
ISSN
0167-2738
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