Abstract
The patination of copper is known for its complexity and heterogeneous formation. For a deeper investigation, a locally resolved surface analysis was considered. An exact determination of the accessed area and a potentiostatic control in a three-electrode configuration was reached with the use of the electrochemical microcell technique, which enables local electrochemical measurement such as local electrochemical impedance spectroscopy and cyclic voltammetry. Such a technique provides a unique way for performing the investigation of heterogeneities on electrode surfaces. The local electrochemical measurements on the artificially patinated surface have allowed distinguishing areas of different reactivity even when the analysis of the surface revealed a homogenous chemical composition of patina. Local measurements with the electrochemical microcell showed the presence of small defects on the patina layer that can be modelled by considering a hemispherical diffusion process at small active areas surrounded by larger less reactive domains.
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Acknowledgements
The authors gratefully acknowledge S. Borensztajn (UPR 15-CNRS) for SEM and EDS analyses and D. Rose (UPR 15-CNRS) for technical helps. M. M. Mennucci acknowledges her Ph.D. grant supported by CAPES and M. Sanchez-Moreno acknowledges the Spanish Education Ministry for her post-doctoral grant.
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Mennucci, M.M., Sanchez-Moreno, M., Aoki, I.V. et al. Local electrochemical investigation of copper patina. J Solid State Electrochem 16, 109–116 (2012). https://doi.org/10.1007/s10008-010-1290-7
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DOI: https://doi.org/10.1007/s10008-010-1290-7