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Electrode kinetics from a single experiment: multi-amplitude analysis in square-wave chronoamperometry.

Dariusz Guziejewski¹, Leon Stojanov², Zuzanna Zwierzak¹

¹Department of Inorganic and Analytical Chemistry, University of Lodz, Tamka 12, 91-403, Lodz, Poland. dguziejewski@uni.lodz.pl.

Physical Chemistry Chemical Physics : PCCP

|October 3, 2022

Summary

Multi-amplitude square-wave chronoamperometry (MA-SWCA) offers a faster and simpler method for estimating kinetic parameters. This technique uses progressively increasing potential pulse heights in a single experiment, outperforming conventional methods.

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Area of Science:

Electrochemistry
Analytical Chemistry

Background:

Square-wave chronoamperometry (SWCA) is a recently developed electrochemical technique.
Estimating kinetic parameters often requires multiple experiments or complex analysis.

Purpose of the Study:

To introduce and evaluate multi-amplitude square-wave chronoamperometry (MA-SWCA).
To demonstrate MA-SWCA's capability for rapid kinetic parameter estimation.

Main Methods:

MA-SWCA involves a potential modulation with progressively increasing square-wave amplitude.
Simulations were performed for dissolved and surface-confined quasireversible electrode reactions.

Main Results:

MA-SWCA allows fast and reliable kinetic parameter estimation in a single experiment.
The method relies on the amplitude-based quasireversible maximum feature.
MA-SWCA demonstrated advantages in simplicity, speed, and efficiency for estimating standard rate constants.

Conclusions:

MA-SWCA is an efficient advancement over conventional square-wave voltammetry (SWV) and SWCA.
This technique simplifies the determination of electrochemical kinetic parameters.