Raman and Electrochemical Impedance Studies of Sol–Gel Titanium Oxide and Single Walled Carbon Nanotubes Composite Films
Titanium oxide grown by a sol–gel route on single-walled carbon nanotubes was studied by Raman and Electrochemical Impedance techniques and compared with mixtures obtained by mechanical grinding. In spite of the superior dispersion of single-walled carbon nanotubes bundles in sol–gel composites, the lost of the small-diameter carbon nanotubes in the oxidizing sol–gel bath was inferred from their Raman spectra and the lower capacitive current of the voltammograms in 0.1 M H2SO4. We proposed proton electrosorption as the main charge storage mechanism for sol–gel composites, favoured by the hydroxylation and n-type conductivity of the oxide, while electrodes based on mixtures were dominated by double-layer charging, developing some pseudocapacitance with potential cycling due to the reversible oxidation of carbon nanotubes. Comparsion with TiO2/Carbon Blacks composites shows the effective role of single-walled carbon nanotubes as templates to control the mesoporous nature of sol–gel composite electrodes.
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Document Type: Research Article
Publication date: April 1, 2007
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