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Electrochemical impedance spectroscopic study of barrier layer thinning in nanostructured aluminium

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Abstract

The electrochemical behaviour of electropolished and anodised aluminium was studied by electrochemical impedance spectroscopy (EIS). Freshly electropolished aluminium behaves as a pure capacitor exhibiting Warburg impedance at low frequencies. Storage of the electropolished aluminium, even in an air-tight bottle, results in the reconstruction of a uniform compact barrier layer. The impedance response of a stored electropolished aluminium as well as anodised aluminium after oxide removal, done by chemical etching, exhibits only a capacitive loop in the complex plane. The effect of the oxide layer thickness on the impedance data was investigated for layers formed during anodising at a cell potential of 15 or 23 V. Impedance measurements carried out over a wide range of frequencies gave useful information on the efficiency of the thinning of the barrier layer at the bottom of porous aluminium oxide layers. The rate of thinning of the barrier layer was estimated for samples anodised at different voltage.

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Acknowledgements

This work was funded by the Flemish Science Foundation (contract FWO G.0299.99) and by the Flemish Government (BIL-Poland 00/15).

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Authors and Affiliations

  1. Departments of Physical Chemistry and Electrochemistry, Jagiellonian University, Ingardena 3, Krakow, 30060, Poland

    G. D. Sulka

  2. Department of VSM, Katholieke Universiteit Leuven, Leuven, 3000, Belgium

    V. Moshchalkov

  3. IMEC, Leuven, 3000, Belgium

    G. Borghs

  4. Department of MTM, Katholieke Universiteit Leuven, Leuven, 3000, Belgium

    G. D. Sulka & J.-P. Celis

Authors
  1. G. D. Sulka
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  2. V. Moshchalkov
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  3. G. Borghs
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  4. J.-P. Celis
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Correspondence to G. D. Sulka.

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Sulka, G.D., Moshchalkov, V., Borghs, G. et al. Electrochemical impedance spectroscopic study of barrier layer thinning in nanostructured aluminium. J Appl Electrochem 37, 789–797 (2007). https://doi.org/10.1007/s10800-007-9312-6

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  • DOI: https://doi.org/10.1007/s10800-007-9312-6

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