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Measurement of the specific surface area of loose copper deposit by electrochemical methods

E. A. Dolmatova, A. V. Patrushev, T. N. Ostanina

Abstract


In the work the surface area of the electrode with dispersed copper deposit obtained within 30 seconds was evaluated by techniques of chronopotentiometry (CPM) and impedance spectroscopy. In method CPM the electrode surface available for measurement depends on the value of the polarizing current. At high currents during the transition time there is a change of surface relief that can not determine the full surface of loose deposit. The electrochemical impedance method is devoid of this shortcoming since the measurements are carried out in indifferent electrolyte in the absence of current. The area measured by the impedance is tens of times higher than the value obtained by chronopotentiometry. It is found that from a solution containing sulfuric acid the deposits form with a high specific surface area. Based on these data it was concluded that the method of impedance spectroscopy can be used to measure in situ the surface area of the dispersed copper deposits.

Keywords


current; chronopotentiometry; loose copper deposit; depletion factor; impedance spectroscopy

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References


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DOI: http://dx.doi.org/10.15826/chimtech.2016.3.2.011

Copyright (c) 2016 E. A. Dolmatova, A. V. Patrushev, T. N. Ostanina

© Chimica Techno Acta, 2014-2019
ISSN 2411-1414 (Online), ISSN 2409-5613 (Print)

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