期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 758, 期 -, 页码 1-6出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2015.10.004
关键词
Electrochemistry; Diffusion coefficient; Electron transfer kinetics; Randle-sevcik equation
资金
- European Research Council [320403]
- European Research Council (ERC) [320403] Funding Source: European Research Council (ERC)
The use of staircase voltammetry for the measurement of reversible diffusional redox species under a linear mass-transport regime leads to significant suppression of the peak currents (up to 20% for larger step sizes) and an increase in the peak-to-peak separation (cf. Delta E-pp similar to 70 mV at the reversible limit as opposed to 57 mV). These discrepancies between the voltammetric results of a staircase and true analogue voltammogram may lead to mis-interpretation of data. This work provides an overview of the differences between the two techniques in the macro-electrode reversible limit and provides new expressions which allow the peak current of a staircase voltammogram to be quantitatively analysed. Moreover, clear guidance is provided about which conditions the application of the provided equation is valid in the terms of mass-transport edge effects to the macro-electrode. (C) 2015 Elsevier B.V. All rights reserved.
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