Abstract
Anodization of copper was performed in 0.1 M K2CO3 at 25 and 50 V. In order to study the influence of the electrolyte usage, samples were anodized in fresh electrolyte and electrolyte that was applied for anodizing for 2, 4 and 6 h. It was found that during anodization, the current oscillates with time. It means that there are cycles of adsorptions and delaminations of the anodic film of the samples. Moreover, the longer the electrolyte is used, the faster steady state of current densities without oscillations is achieved and the greater the current densities are. According to the Pourbaix diagram, the greater concentration of the water soluble copper species, the greater the CuO passivity field, thus the anodic oxides are formed much easier. For this reason, X-ray diffraction patterns revealed increasing content of tenorite phase (CuO) over cuprite (Cu2O) when the electrolyte is being re-used. For electrolytes pre-used for 6 h, no cuprite was found in the samples. Moreover, the longer the pre-usage of the electrolyte, the smaller the diameter of the grown nanowires. For anodizing performed at 25 V, nanowire diameter decreases from 55 ± 12 nm to 36 ± 7 nm (electrolyte pre-used for 6 h) in a linear manner.
Published Version
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