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Guziejewski D, Stojanov L, Zwierzak Z, Compton RG, Mirceski V. Electrode kinetics from a single experiment: multi-amplitude analysis in square-wave chronoamperometry. Phys Chem Chem Phys 2022; 24:24419-24428. [PMID: 36189648 DOI: 10.1039/d2cp01888h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The recently introduced technique of square-wave chronoamperometry (SWCA) is studied under conditions of progressively increasing height of potential pulses (square-wave amplitude) within a single experiment. In multi-amplitude square-wave chronoamperometry (MA-SWCA) a potential modulation consisting of square-wave forward and reverse potential pulses is imposed on a constant mid-potential; the amplitude of pulses increases progressively during the experiment. This allows the fast and reliable estimation of kinetic parameters at a constant pulse frequency in a single experiment, based on the resulting feature known as the amplitude-based quasireversible maximum. The proposed methodology is tested by simulating the responses of a simple quasireversible electrode reaction of a dissolved redox couple and a surface confined electrode reaction. Compared with conventional square-wave voltammetry (SWV) and SWCA, MA-SWCA shows advantages in estimation of the standard rate constant in terms of simplicity, speed and efficiency for both studied electrode mechanisms.
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Affiliation(s)
- Dariusz Guziejewski
- Department of Inorganic and Analytical Chemistry, University of Lodz, Tamka 12, 91-403, Lodz, Poland.
| | - Leon Stojanov
- Institute of Chemistry, Faculty of Natural Sciences and Mathematics, "Ss Cyril and Methodius" University in Skopje, P.O. Box 162, 1000, Skopje, Republic of North Macedonia
| | - Zuzanna Zwierzak
- Department of Inorganic and Analytical Chemistry, University of Lodz, Tamka 12, 91-403, Lodz, Poland.
| | - Richard G Compton
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK
| | - Valentin Mirceski
- Department of Inorganic and Analytical Chemistry, University of Lodz, Tamka 12, 91-403, Lodz, Poland.
- Institute of Chemistry, Faculty of Natural Sciences and Mathematics, "Ss Cyril and Methodius" University in Skopje, P.O. Box 162, 1000, Skopje, Republic of North Macedonia
- Macedonian Academy of Sciences and Arts, Bul. Krste Misirkov 2, 1000, Skopje, Republic of North Macedonia
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