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Kinetics of the electrochemically-assisted deposition of sol-gel films

Abstract

Electrochemically-assisted deposition is now becoming a widespread method for preparing sol-gel films. It is based on the electrochemical generation of OH- ions which catalyze the sol-gel condensation reactions. It has a key advantage of selectively facilitating the film deposition on electrochemically active surfaces while not affecting the stability of the bulk precursor solution. Experimental works have clearly shown that the thickness of electrochemically-assisted deposited films is influenced by deposition parameters such as potential and time. However, there is still lack of quantitative description for the kinetics of film growth due to the complexity of the process. In this preliminary work, we have derived quantitative analytical expressions for describing the kinetics associated to the growth of sol-gel films generated by electrochemically-assisted deposition. Both the heterogeneous and homogeneous condensation reactions are considered. The key strategy is to simplify the process by separating the electrochemical step of generating OH- ions with the condensation steps of film formation under approximations. Furthermore, numerical simulation is carried out to examine the validity and error of the analytical expressions in the cases when the required approximations are not fulfilled. The analytical expressions can well explain the trends observed in experimental works, and can be used for fitting the experimental results from literature. This work provides a deeper understanding of the mechanism and a quantitative guidance for manipulating the electrochemically-assisted deposition processes at large scale in industry. It may also be referred by other indirect electrodeposition systems in which the deposition is not an electrochemical step but is driven by electrochemically generated catalysts.

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Supplementary files

Publication details

The article was received on 20 Mar 2017, accepted on 13 May 2017 and first published on 16 May 2017


Article type: Paper
DOI: 10.1039/C7CP01775H
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Kinetics of the electrochemically-assisted deposition of sol-gel films

    L. Liu and A. Walcarius, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP01775H

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