Details
| Original language | English |
|---|---|
| Pages (from-to) | 190-196 |
| Number of pages | 7 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 99 |
| Issue number | 1-2 |
| Early online date | 31 Oct 2006 |
| Publication status | Published - 1 Feb 2007 |
Abstract
A detailed comparison of the proton conductivity of three highly ordered mesoporous silica host materials with large inner surface (Si-MCM-41, Si-SBA-15, Si-SBA-16) functionalised with sulfonic acid groups, which were obtained by anchoring and oxidation of thiol groups, is presented. The samples were characterised by X-ray diffraction, nitrogen adsorption, electron microscopy, FT-infrared spectroscopy and TGA/DTA measurements. The proton conductivity is deduced from impedance spectra taken in the temperature range 60-140 °C. All materials show strong dependence of the proton conductivities on the relative humidity, the degree of functionalisation and the pore geometry parameters. Whereas Si-SBA-16 composite materials are poor proton conductors due to the non-directed cubic 3D pore arrangement, functionalised Si-SBA-15 and Si-MCM-41 with hexagonal 1D pore channels exhibit promising proton conductivities at temperatures above 100 °C. For Si-MCM-41 the higher water storage capability is of additional advantage.
Keywords
- Functionalised mesoporous silica, Impedance spectroscopy, PEM fuel cell membranes, Proton conductivity, Solid proton conductors
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
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In: Microporous and Mesoporous Materials, Vol. 99, No. 1-2, 01.02.2007, p. 190-196.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Proton conductivity of sulfonic acid functionalised mesoporous materials
AU - Marschall, Roland
AU - Bannat, Inga
AU - Caro, Jürgen
AU - Wark, Michael
PY - 2007/2/1
Y1 - 2007/2/1
N2 - A detailed comparison of the proton conductivity of three highly ordered mesoporous silica host materials with large inner surface (Si-MCM-41, Si-SBA-15, Si-SBA-16) functionalised with sulfonic acid groups, which were obtained by anchoring and oxidation of thiol groups, is presented. The samples were characterised by X-ray diffraction, nitrogen adsorption, electron microscopy, FT-infrared spectroscopy and TGA/DTA measurements. The proton conductivity is deduced from impedance spectra taken in the temperature range 60-140 °C. All materials show strong dependence of the proton conductivities on the relative humidity, the degree of functionalisation and the pore geometry parameters. Whereas Si-SBA-16 composite materials are poor proton conductors due to the non-directed cubic 3D pore arrangement, functionalised Si-SBA-15 and Si-MCM-41 with hexagonal 1D pore channels exhibit promising proton conductivities at temperatures above 100 °C. For Si-MCM-41 the higher water storage capability is of additional advantage.
AB - A detailed comparison of the proton conductivity of three highly ordered mesoporous silica host materials with large inner surface (Si-MCM-41, Si-SBA-15, Si-SBA-16) functionalised with sulfonic acid groups, which were obtained by anchoring and oxidation of thiol groups, is presented. The samples were characterised by X-ray diffraction, nitrogen adsorption, electron microscopy, FT-infrared spectroscopy and TGA/DTA measurements. The proton conductivity is deduced from impedance spectra taken in the temperature range 60-140 °C. All materials show strong dependence of the proton conductivities on the relative humidity, the degree of functionalisation and the pore geometry parameters. Whereas Si-SBA-16 composite materials are poor proton conductors due to the non-directed cubic 3D pore arrangement, functionalised Si-SBA-15 and Si-MCM-41 with hexagonal 1D pore channels exhibit promising proton conductivities at temperatures above 100 °C. For Si-MCM-41 the higher water storage capability is of additional advantage.
KW - Functionalised mesoporous silica
KW - Impedance spectroscopy
KW - PEM fuel cell membranes
KW - Proton conductivity
KW - Solid proton conductors
UR - http://www.scopus.com/inward/record.url?scp=33845964246&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2006.08.037
DO - 10.1016/j.micromeso.2006.08.037
M3 - Article
AN - SCOPUS:33845964246
VL - 99
SP - 190
EP - 196
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - 1-2
ER -