Organic-inorganic composite membranes as addition of SiO2 for high temperature-operation in polymer electrolyte membrane fuel cells (PEMFCs) |
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Authors: | You Mee Kim Heung Chan Lee Keon Kim Ho-In Lee |
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Affiliation: | a Division of Chemistry and Molecular Engineering, Korea University, 5-1, Anamdong, SungBuk-Ku, Seoul, 136-701, South Korea b School of Chemical Engineering and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-742, South Korea |
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Abstract: | Organic-inorganic composite membranes for operation above 100 °C in polymer electrolyte membrane fuel cells (PEMFCs) were prepared, characterized and cell-tested. Composite membranes were obtained by mixing organic polymers, which have a SO3H group as a proton conductor with inorganic material, SiO2, using the sol-gel process. Electron probe micro analyser (EPMA) was used to show the homogeneous and uniform distribution of SiO2. The physico-chemical properties of all membranes were investigated regarding their tensile strength, water uptake and thermogravimetric analyzer (TGA). Due to a higher water uptake and thermal stability of composite membranes, the cell performances at high temperatures above 100 °C, were improved. In addition, the SiOH group in the composite membrane was shown to play a major role in capturing water strongly and maintaining proton conductivity even at high temperature. Furthermore, the fuel cell performance of organic-inorganic composite membranes was superior to that of the Nafion membrane at high current density over all ranges of temperature. |
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Keywords: | Polymer electrolyte High temperature-operation Organic-inorganic composite membrane SiO2 Cell performance |
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