Characterizing electrode reactions by multisampling the current in square-wave voltammetry

Mirceski, Valentin and Guziejewski, Dariusz and Bozem, Monika and Bogeski, Ivan (2016) Characterizing electrode reactions by multisampling the current in square-wave voltammetry. Electrochimica Acta 213. pp. 520-528. ISSN 0013-4686

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A novel and simple methodology for characterization of electrode processes by square-wave
voltammetry (SWV), considered as a complex repetitive double-step chronoamperometric experiment,
is proposed. Specifically, the sampling of the current at the very end of each potential pulse, as common in
conventional SWV, is replaced with a multisampling protocol during each potential pulse, resulting in
generation of a series of corresponding multisampled SW voltammograms constructed out of a single
measurement. The evolution of such voltammograms reflects the chronoamperometric properties of the
current in the course of each potential pulse, thus being specific to electrode mechanism and electrode
kinetics. The proposed methodology could serve as a basis for modification of common SWV mode in
commercially available instrumentation for the purpose of an advanced characterization of electrode
processes. The methodology is theoretically illustrated by the analysis of three kinetically controlled
common electrode mechanisms, such as the electrode reaction of a solution resident and surface
confined redox couples, as well as the regenerative catalytic electrode mechanism (EC’), while the
experimental verification is done with the electrode reaction of Eu3+/Eu2+ and azobenzene/
hydrazobenzene redox couples.

Item Type: Article
Uncontrolled Keywords: square-wave voltammetry, electrode kinetics, chronoamperometry simulations
Subjects: Engineering and Technology > Chemical engineering
Natural sciences > Chemical sciences
Divisions: Faculty of Medical Science
Depositing User: Biljana Kosturanova
Date Deposited: 30 Mar 2017 08:56
Last Modified: 30 Mar 2017 08:56

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