Critical Aspects in Exploring Time Analysis for the Voltammetric Estimation of Kinetic Parameters of Surface Electrode Mechanisms Coupled with Chemical Reactions

Gulaboski, Rubin and Mirceski, Valentin and Lovrić, Milivoj (2021) Critical Aspects in Exploring Time Analysis for the Voltammetric Estimation of Kinetic Parameters of Surface Electrode Mechanisms Coupled with Chemical Reactions. Macedonian Journal of Chemistry and Chemical Engineering, 40 (1). pp. 1-9. ISSN 1857-5552

Text 2270-Gulaboski-MJCCE 2021 may.pdf - Published Version Download (920kB)

Abstract

The accurate determination of the rate constant related to the electron transfer step of so-called
“surface redox active compounds” by voltammetric measurements is very important because it is linked
to the reactivity and stability of many biological and chemical systems such as redox enzymes, vitamins,
hormones, and many more. Evaluation of the kinetics of the electron transfer is often challenging, especially when chemical equilibria are coupled to the electron transfer step. In this work, we theoretically
consider some critical aspects of the time-related methodologies in square-wave voltammetry (SWV),
which is designed to analyze the kinetics of the electron transfer step of surface mechanisms coupled with
chemical reactions. We demonstrate with a series of simulated scenarios that caution must be taken when
exploring the time-related analysis for kinetic characterizations for both surface CE and EC mechanisms.
The main concern stems from the fact that the SW frequency simultaneously affects both the kinetics of
electron transfer and that of chemical reactions as well. Under defined conditions, the SW frequency variation in the case of surface EC and CE mechanisms may produce unexpected features of the voltammetric
patterns. In many scenarios, time-independent analysis, such as those related to the square-wave amplitude and potential increment, are seen as alternative tools to evaluate the rate parameter of electrode reactions.

Item Type:	Article
Impact Factor Value:	0.829
Subjects:	Natural sciences > Chemical sciences Natural sciences > Physical sciences
Divisions:	Faculty of Medical Science
Depositing User:	Rubin Gulaboski
Date Deposited:	12 May 2021 07:11
Last Modified:	12 May 2021 07:11
URI:	https://eprints.ugd.edu.mk/id/eprint/28084

Actions (login required)

View Item