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Issue 35, 2014
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Cavity transport effects in generator–collector electrochemical analysis of nitrobenzene

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Abstract

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.

Graphical abstract: Cavity transport effects in generator–collector electrochemical analysis of nitrobenzene

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Publication details

The article was received on 05 Jul 2014, accepted on 28 Jul 2014 and first published on 05 Aug 2014


Article type: Paper
DOI: 10.1039/C4CP02943G
Citation: Phys. Chem. Chem. Phys., 2014,16, 18966-18973
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    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 and F. Marken, Phys. Chem. Chem. Phys., 2014, 16, 18966
    DOI: 10.1039/C4CP02943G

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