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Bauer, Felix ; Willert-Porada, Monika:
Microwave Assisted Synthesis of Hybrid Organic-Inorganic Membranes for Fuel Cell Applications.
In:
3rd World Congress on Microwave and Radio Frequency Applications. -
Sydney
: Institute of Engineers
,
2002
. - S. 233-234
ISBN 9781877040122
Abstract
There is still a need for the further development of membrane materials for the direct methanol
cell (DMFC). Existing materials properties can be improved by addition of inorganic fillers. In this paper the applicability of microwave processing was examined for its use for in-situ synthesis of inorganic filler materials in Nafion membranes. For a better understanding of the processes occuring during the exposure to microwave frequency radiation the dielectric properties of Nafion were examined under different conditions of temperature, humidity and filler material. Titanium butylate was used as precursor for titania. The inverse micelle structural model of Nafion was applied to explain the experimental results. Two different reaction routes hydrolysis and pyrolysis were carried out, respectively. The hybrid membranes were characterised by their Xray diffraction patterns, and in case of the hydrolysis reaction route the effective diffusion coefficient and the conductivity as a function of humidity was measured and compared to the parent material. At 100 °C in water saturated air the conductivity of Nafion 117 and a Nafion-TiO2 (23 wt%) hybrid membrane were 0.1 Ω-1cm-1 diffusion coefficients measured at 20 °C were 2.0⋅10-10 m2s-1 and 4.2⋅10-11 m2s-1, respectively. The results seem to be promising for further tests in a single DMFC.
Weitere Angaben
| Publikationsform: | Aufsatz in einem Buch |
|---|---|
| Begutachteter Beitrag: | Nein |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren > Lehrstuhl Werkstoffverarbeitung - Univ.-Prof. Dr. Monika Willert-Porada Fakultäten Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverfahrenstechnik Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 30 Apr 2015 08:17 |
| Letzte Änderung: | 30 Apr 2015 08:17 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/11223 |