Abstract
In most reports that propose mechanisms by which nanostructured TiO2 films are synthesised, little information about chemical reaction kinetics that lead to anodic current density transients is provided. Analyses of the anodic current signal have therefore been mostly experimental, leaving previously proposed nanotube development mechanisms unverified by fundamentals of chemical reaction kinetics. Without customising an existing current/conductivity or data-fitting function, the anodic current density is simulated in this work, using a mathematical model of anodization reaction kinetics. From a system of 14 differential equations, a numerical integration algorithm is formulated and executed. The results show current transients that have a strong correlation with measurements from seven samples grown in ethylene glycol-NH4F electrolytes. Having tested the model at limits of low and high NH4F content, this technique proves that the anodic current measured during TiO2 growth is actually an integral function of the kinetics of the redox reactions of water.
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