Electrical conductivity of sulfonated poly(ether ether ketone) based composite membranes containing sulfonated polyhedral oligosilsesquioxane
| Autor: | Raquel Santos Mauler, Fabrício Celso, Serge Kaliaguine, Marco Antônio Siqueira Rodrigues, Serguei D. Mikhailenko |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Composite number Energy Engineering and Power Technology 02 engineering and technology Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Dielectric spectroscopy Membrane Chemical engineering Electrical resistivity and conductivity Polymer chemistry Electrical and Electronic Engineering Physical and Theoretical Chemistry Thin film 0210 nano-technology Electrical conductor |
| Zdroj: | Journal of Power Sources. 305:54-63 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2015.10.112 |
| Popis: | Composite proton exchange membranes (PEMs) intended for fuel cell applications were prepared by embedding of various amounts of dispersed tri-sulfonic acid ethyl POSS (S-Et-POSS) and tri-sulfonic acid butyl POSS (S-Bu-POSS) in thin films of sulfonated poly ether–ether ketone. The electrical properties of the PEMs were studied by Impedance spectroscopy and it was found that their conductivity σ changes with the filler content following a curve with a maximum. The water uptake of these PEMs showed the same dependence. The investigation of initial isolated S-POSS substances revealed the properties of typical electrolytes, which however in both cases possessed low conductivities of 1. 17 × 10−5 S cm−1 (S-Et-POSS) and 3.52 × 10−5 S cm−1 (S-Bu-POSS). At the same time, the insoluble in water S-POSS was found forming highly conductive interface layer when wetted with liquid water and hence producing a strong positive impact on the conductivity of the composite PEM. Electrical properties of the composites were analysed within the frameworks of effective medium theory and bounding models, allowing to evaluate analytically the range of possible conductivity values. It was found that these approaches produced quite good approximation of the experimental data and constituted a fair basis for interpretation of the observed relationship. |
| Databáze: | OpenAIRE |
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