Sensitivity Enhancement in Double-Step Voltcoulometry as a Consequence of the Changes in Redox Kinetics on the Microelectrode Exposed to Low Frequency Sound

A Review of Non-Cottrellian Diffusion Towards Micro- and Nano-Structured Electrodes

“…As an alternative explanation of the marked sensitivity enhancement the authors suggested a possible change in the electrical double layer structure. Later, a study of the dopamine redox reactions on the carbon fiber microelectrode by the kinetics-sensitive voltcoulometry (Gmucová et al, 2002) revealed an impressive shift towards the ideal kinetic described by Cottrell equation, achieved by an electrochemical pretreatment of the electrode accompanied by its simultaneous exposure to the low frequency sound.…”

“…The parameter  that enters the power-law time dependence of the transient charge, as well as the fractal dimension can be simply determined from two voltcoulograms obtained for two distinct sets of sampling events (Gmucová et al, 2002).…”

Monitoring of Oxidation Steps of Ascorbic Acid Redox Reaction by Kinetics-Sensitive Voltcoulometry in Unsupported and Supported Aqueous Solutions and Real Samples

“…[10][11][12] It is common to assume that the transient response of an electrochemical system consists of the following current contributions: the diffusion current, the capacitive current, and the steady-state current. The problem to be overcome in all voltcoulometric experiments is the necessity to suppress the parasitic signal due to charging the electrical double-layer near the electrode, i.e.…”

“…The kineticsdiscrimating feature of DSVCM was detailed in our previous works. [10][11][12] Here, it is worth mentioning that the simultaneous application of at least two electrochemical methods, one of them sensitive to kinetics, can be useful for a better understanding of the redox processes taking place in the analyte under consideration.…”

“…By that way, the experimental equipment enables us to obtain the following two data sheets from a single scan of the potential: the correlated differential charge (∆q(E)) and the steady-state voltammetric wave (I(E)). 10,11 These data, detached to the same period from the sample preparation provide valuable information about the kinetics of the redox reaction under consideration 12 as well as about the percentage of individual species dissolved in the measured sample.…”