Abstract
Despite the wide application of anodization, the mechanism is still under debate and requires quantitative analyses. Based on the oxygen bubble mould effect model, the total current contains ionic current and electronic current. The ionic current corresponds to the oxide formation, while the electronic current represents the oxygen bubble generation. In this article, we focus on the galvanostatic anodization of TiO2 nanotubes. We develop a fitting model and simplify it by introducing intermediate parameters. The transients are fitted on 30, 40 and 50 mA, which exhibits high fidelity. The two types of current is also separated mathematically based on the model. The linear relation between nanotube length and the steady value of ionic current are determined, which proves the reasonability and applicability of the model.
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