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Study of the Effects of Nonlinear Potential Sweeps on Voltammetry
Author(s) -
Ogurtsov Vladimir I.,
Beni Valerio,
Strutwolf Jörg,
Arrigan Damien W. M.
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200804375
Subject(s) - linear sweep voltammetry , potassium ferrocyanide , voltammetry , horizontal scan rate , cyclic voltammetry , waveform , nonlinear system , signal (programming language) , ferrocyanide , solution of schrödinger equation for a step potential , electrode , materials science , constant (computer programming) , analytical chemistry (journal) , chemistry , biological system , electrochemistry , computer science , voltage , inorganic chemistry , chromatography , physics , electrical engineering , engineering , quantum mechanics , biology , programming language
Voltammetric methods use a constant sweep rate during the course of a scan. This paper reports a study of the influence of a nonconstant sweep rate on the voltammetric response. In this approach, either continuously increasing or continuously decreasing potential scan rates can be employed, unlike presently available methods which rely on a constant sweep rate. The voltammetric response of potassium ferrocyanide at a glassy carbon electrode was used as a model system to test the new method. The responses obtained using traditional staircase voltammetry (linear staircase voltammetry) and the new approach (nonlinear staircase voltammetry) were compared by experiment and by simulation. The new approach offers capability for signal enhancement, whereby enhanced current or enhanced peak shape can be obtained by choice of appropriate waveform parameters.