Linear sweep voltammetry with non-triangular waveforms: New opportunities in electroanalysis

The voltammetry of two simultaneous electrochemically reversible reactions with different formal potentials is investigated at a macroelectrode for a conventional linear potential waveform and a herein newly proposed semi-circular potential waveform, which, at the midpoint of the potential window sh...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2018-06, Vol.818, p.140-148
Main Authors: Uchida, Yuki, Kätelhön, Enno, Compton, Richard G.
Format: Article
Language:English
Subjects:
Electric noise
Electroanalysis
Electrodes
Electrolytic analysis
Linear equations
Linear sweep voltammetry
Scanning
Selective detection of species
Semi-circular potential waveform
Transiently infinitely fast scan rates
Voltammetry
Waveforms
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Summary:The voltammetry of two simultaneous electrochemically reversible reactions with different formal potentials is investigated at a macroelectrode for a conventional linear potential waveform and a herein newly proposed semi-circular potential waveform, which, at the midpoint of the potential window shows an instantaneous infinite scan rate and relatively very slow scan rates in other areas of the wave. We show that the method increases the sensitivity of detection of individual species by greatly amplifying the peak current of one species while suppressing the interference with the other species and is thus ideal for analytical applications. •New method performs exquisitely sensitive voltammetry for electroanalysis.•A semi-circular potential waveform transiently creates infinitely fast scan rates for maximum current.•Semi-circular potential wave sensitively detects individual species in a mixture.•Formal potentials estimated through amplification of current contribution of one species while suppressing others.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2018.04.028