Perfluorosulfonic acid ionomer – silica composite membranes prepared using hyperbranched polyethoxysiloxane for polymer electrolyte membrane fuel cells
| Autor: | Radu Fechete, Dimitri A. Ivanov, Andreas Graichen, Carmen I. Horvat, R. A. Vinokur, Xiaomin Zhu, Dan E. Demco, David Türp, Denis V. Anokhin, Oliver Conradi, Martin Möller |
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| Rok vydání: | 2012 |
| Předmět: |
chemistry.chemical_classification
Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology Proton exchange membrane fuel cell Polymer Electrolyte Condensed Matter Physics Dielectric spectroscopy chemistry.chemical_compound Fuel Technology Membrane chemistry Chemical engineering Transmission electron microscopy Polymer chemistry Ionomer Sol-gel |
| Zdroj: | International Journal of Hydrogen Energy. 37:14454-14462 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2012.07.014 |
| Popis: | We report on the preparation and characterization of perfluorosulfonic acid ionomer (PFSA) – silica composite membranes using hyperbranched polyethoxysiloxane (PEOS) as silica precursor. The membranes were formed via an in situ sol–gel process of PEOS in a PFSA solution and subsequent solution casting. Transmission electron microscopy and small-angle X-ray scattering data showed that at low silica content ultra-small silica particles with a size smaller than the diameter of the ionic channels were homogeneously dispersed in the PFSA matrix. Such morphology leads to enhanced proton mobility as probed by impedance spectroscopy and 1H solid-state NMR, and eventually resulted in the improvement of fuel cell performance. |
| Databáze: | OpenAIRE |
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