The thermal decomposition of a linear perfluoropolyether peroxide produced perfluoropolyether radicals that covalently bonded the unsaturated moieties on the surface of carbon black and carbon cloth. Measurements of contact angles demonstrated that water droplets were enduringly stable on the treated materials and that contact angle values were significantly high, exceeding the superhydrophobicity threshold. On the contrary, the droplets were adsorbed in few seconds by the native materials. Conductivity measurements showed that the covalent linkage of fluorinated chains weakly modified the electrical properties of the conductive carbonaceous materials, even if the surface properties changed so deeply. The relationship between the linkage of fluorinated chains and the variations of physical-chemical properties were studied combining X-ray photoelectron spectroscopy, resistivity measurements, scanning electron microscopy and surface area analysis. The modified carbon cloth was also tested out as gas-diffusion layer in a fuel cell and preliminary results were recorded.

Conductivity and superhydrophobic effect on PFPE-modified porous carbonaceous materials / M. Sansotera, W. Navarrini, M. Gola, G. Dotelli, P. Gallo Stampino, C.L. Bianchi. - In: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY. - ISSN 0360-3199. - 37:7(2012), pp. 6277-6284. ((Intervento presentato al 12. convegno International Symposium on Polymer Electrolytes: New Materials for Application in Proton Exchange Membrane Fuel Cells tenutosi a Padova nel 2010.

Conductivity and superhydrophobic effect on PFPE-modified porous carbonaceous materials

C.L. Bianchi
Ultimo
2012

Abstract

The thermal decomposition of a linear perfluoropolyether peroxide produced perfluoropolyether radicals that covalently bonded the unsaturated moieties on the surface of carbon black and carbon cloth. Measurements of contact angles demonstrated that water droplets were enduringly stable on the treated materials and that contact angle values were significantly high, exceeding the superhydrophobicity threshold. On the contrary, the droplets were adsorbed in few seconds by the native materials. Conductivity measurements showed that the covalent linkage of fluorinated chains weakly modified the electrical properties of the conductive carbonaceous materials, even if the surface properties changed so deeply. The relationship between the linkage of fluorinated chains and the variations of physical-chemical properties were studied combining X-ray photoelectron spectroscopy, resistivity measurements, scanning electron microscopy and surface area analysis. The modified carbon cloth was also tested out as gas-diffusion layer in a fuel cell and preliminary results were recorded.
Fuel cells ; Microporous layer ; Gas-diffusion layer ; Water management
Settore CHIM/04 - Chimica Industriale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/180307
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