Effect of ion pairing on steady state voltammetric limiting currents at microelectrodes part II. Experimental studies on charged (Br-, Ag+) and uncharged ( copper diethyldithiocarbamate) species in toluene

Abstract

Steady state voltammetric studies on the reduction and oxidation of uncharged copper diethyldithiocarbamate, the reduction of silver cations and the oxidation of bromide anions have been performed in toluene at various concentrations of electroactive species and supporting electrolyte (tetrahexylammonium hexafluorophosphate), utilising platinum inlaid microdisk working electrodes. In cases where the supporting electrolyte is in excess, the voltammetric waves are without too much distortion from IR drop, and the experimental results for the limiting current are consistent with extensive pairing of the electroactive ion with the counter ion of the supporting electrolyte, as well as between the supporting ions themselves. The range of support ratios that can be successfully studied is restricted by the solubility of the supporting electrolyte and by the severe ohmic polarization that is encountered when the ionic content is low. Nevertheless, it has been possible to measure limiting currents over sufficient ranges of electroactive and supporting electrolyte concentrations to demonstrate that the theory in Part I of this two-part sequence of articles is adequate to interpret the experimental findings. © 1997 Elsevier Science S.A.

Source or Periodical Title

Journal of Electroanalytical Chemistry

ISSN

15726657

Page

39-46

Document Type

Article

Subject

Ion pairing, Limiting current, Microelectrodes, Steady state voltammetry

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