Cavity transport effects in generator-collector electrochemical analysis of nitrobenzene

G.E.M. Lewis, S.E.C. Dale, B. Kasprzyk-Hordern, A.T. Lubben, E.O. Barnes, R.G. Compton, F. Marken

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6 Citations (SciVal)


Two types of generator-collector electrode systems, (i) a gold-gold interdigitated microband array and (ii) a gold-gold dual-plate microtrench, are compared for nitrobenzene electroanalysis in aerated aqueous 0.1 M NaOH. The complexity of the nitrobenzene reduction in conjunction with the presence of ambient levels of oxygen in the analysis solution provide a challenging problem in which feedback-amplified generator-collector steady state currents provide the analytical signal. In contrast to the more openly accessible geometry of the interdigitated array electrode, where the voltammetric response for nitrobenzene is less well-defined and signals drift, the voltammetric response for the cavity-like microtrench electrode is stable and readily detectable at 1 μM level. Both types of electrode show oxygen-enhanced low concentration collector current responses due to additional feedback via reaction intermediates. The observations are rationalised in terms of a "cavity transport coefficient" which is beneficial in the dual-plate microtrench, where oxygen interference effects are suppressed and the analytical signal is amplified and stabilised.
Original languageEnglish
Pages (from-to)18966-18973
Number of pages8
JournalPhysical Chemistry Chemical Physics
Issue number35
Early online date5 Aug 2014
Publication statusPublished - 21 Sept 2014


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