Effect of electrolyte composition on TiO₂ nanotubular structure formation and its electrochemical evaluation
By Deen, K.M.; Farooq, A.; Raza, M.A. & Haider, W.
Published in Electrochimica Acta
NULL
2014
Abstract
Nanotubular structures of TiO₂ were synthesized on Ti6Al4 V alloy in various electrolytes with and without fluoride ions and were then evaluated by potentiodynamic polarization tests and electrochemical impedance spectroscopy. The resultant surface features were revealed through scanning electron microscopy. It was observed that barrier type oxide film is formed in halide free acidic electrolyte. From potentiodynamic polarization scans it was deduced that high current density in 0.15 M NH₄F containing electrolyte corresponded to the formation of TiO₂ nanotubes by slow field driven Ti⁴⁺ ions diffusion in the electrolyte than field assisted TiO₂ growth. Two time constant impedance spectra were simulated to the field assisted charge transfer reactions at high frequency (dissolution of TiO₂ by fluoride ions) and at low frequency (adsorption of oxidase ions) regime. X-ray diffraction pattern of as anodized surface revealed oxygen deficient Ti₆O phase, which was converted to rutile/anatase phases by heat treatment in air.
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