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Title: Carbon nanotubes/carbon xerogel-nafion electrodes: A comparative study of preparation methods
Author: Ordenana-Martinez, A.S.
Rincon, M.E.
Vargas, M.
Estrada-Vargas, A.
Casillas, N.
Barcena-Soto, M.
Ramos, E.
Issue Date: 2012
Abstract: We report the preparation and electrochemical characterization of carbon nanotubes (CNT)/carbon xerogel-nafion (CXN) electrodes obtained by casting carbon nanotube inks on carbon xerogel-nafion matrixes under terrestrial (g) and enhanced (13g) gravity. The impregnated electrodes were compared with composites prepared by mixing CXN dispersions with CNT inks. For casted CNT, alternate current scanning electrochemical microscopy studies along the film-electrode area showed differences that can be correlated with the position of the electronic conducting CNT phase on the more resistive matrix. It revealed the transition from a conductive to dielectric surface when impregnation takes place at terrestrial and enhanced gravity, respectively. Although the addition of CNT enhances the capacitance and mechanical properties of CXN in all preparation methods, the largest specific capacitance was observed in electrodes impregnated at 1 g. Electrodes prepared by mixing and those casted at 13g show similar capacitance values regardless of contrasting conductivity. A mechanism explaining the microstructural, electrical, and adsorptive differences brought out by the various preparation methods is proposed. Zapotitlán Springer-Verlag 2012.
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