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

Abstract

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.

Semi-Circular Potential Sweep Voltammetry: Electrochemically Quasi-Reversible System

“…This limitation was also observed in previous experimental implementation of SCV [7]. These results are in perfect accordance with previous theoretical and experimental reports by Compton group [4,7], indicating the validity of our approach.…”

“…This unique feature amplifies both faradic current and nonfaradic current at midpoint and attenuate them outside of midpoint. Compton group proposed that the semi-circular potential sweep voltammetry can be applied to the precise determination of formal potential from LSV [4] and the determination of low concentration analyte [5].…”

“…Herein we report the theoretical investigation of semi-circular potential sweep voltammetry for quasireversible charge transfer system on electrode. Previous reports on semi-circular potential sweep voltammetry studied the theory on electrode for reversible charge transfer [3,4], the simulation on microelectrode for quasi-reversible system [6], and the experimental verification [7]. Our system is based on macroelectrode where electrode area is sufficiently large neglecting edge effect in diffusion layer thickness.…”

“…To prove the validity of COMSOL simulation, SCV of reversible electrode reaction was investigated first [4]. Fig.…”

Raman Spectroscopy vs Voltammetry: A Voltammetric Approach to Elucidate Different Chemicals in a Range of Pharmaceutical Tablets

“…On the other hand, the electroanalytical studies have focused the quantitative drug analyses, yielding sensitivity in µmol L -1 ranges, whereas, there are only a few attempts in identification assays without the use of chemically modified electrodes (CME) [7][8][9][10]. Despite the employment of CMEs, voltammetry can display different analytical signals that distinguish species, that might be useful for identification purposes and deserves investigation [11].…”