Preparation and Characterization of TiO2 Nanotube Arrays in Ionic Liquid for Water Splitting

摘要: Abstract In the present work, it is described fabrication and characterization of TiO 2 nantotubes prepared potentiostatically using 1.0 or 5.0 vol.% ionic liquid electrolyte medium at 10 20 °C. These experimental conditions led to nanotubes with 63-77 nm pore diameter, crystallite sizes between 27-33 nm, band-gap values in 3.1-3.2 eV range. Although morphology were similar, water splitting reaction showed differences terms photocurrent, up 300%. Besides, we report also important changes those parameters related electronic defects, such as carrier density ( N D ), width depletion layer w ) Debye length (λ ). Then, enhancement on photoelectrochemical properties could be a decrease rate surface recombination processes. Finally, these proposition are agreement open-circuit voltage-decay, where was observed higher electron lifetime for NT obtained liquid.