Abstract
• We evaluate the use of Digital Video Electrochemistry together with Cyclic Voltammetry. • We obtain theoretical expressions for color variance and color intensity derivative curves against the potential that are in good agreement with current curves during voltammetry. • Color efficiencies can be obtained and used to identify different processes during cyclic voltammetry. Coupling cyclic voltammetry with digital video electrochemistry allows identifying different electrochemical processes overlapped. Mathematical description of the time evolution of mean color intensities and their standard deviation at the studied electrode surface during voltammetric experiments were developed. Parallel electrochemical reactions and the presence of colored intermediate species was also evaluated. Single expressions for the shape of these curves, including the maximum of peaks or the half-peak widths are analyzed on the basis of a single layer covered electrode. The good similitude among current, mean color intensities derivative and variance curves allows a statistical interpretation for these processes.
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