Abstract
The methods of electrochemical impedance spectroscopy and electron microscopy with X-ray electron probe analysis are used to study two types of oxide films on aluminum: a smooth compact one and a porous one (nanooxide) formed by two-stage oxidation. An equivalent circuit is chosen that agrees well with the obtained impedance spectra and allows estimating the thickness and conductivity of barrier oxide layers and also the area occupied by nanopores for various film types.
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Notes
This can be related to nonlinear voltammetric characteristic of conductivity in ionic conductors due to the activation mechanism of ion charge transport. Here, the higher the field, the lower the activation barrier, the lower the exponent, and the lower the resistance.
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Shcherbakov, A.I., Korosteleva, I.G., Kasatkina, I.V. et al. Impedance of an Aluminum Electrode with a Nanoporous Oxide. Prot Met Phys Chem Surf 55, 689–694 (2019). https://doi.org/10.1134/S2070205119040208
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DOI: https://doi.org/10.1134/S2070205119040208