Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Simultaneous Determination of Diffusion Coefficient and Concentration by Chronoamperometry at a Microdisk Electrode

  • Jung, Yong-Ju (Department of Chemistry, Korea Advanced Institute of Science and Technology) ;
  • Kwak, Juh-Youn (Department of Chemistry, Korea Advanced Institute of Science and Technology)
  • Published : 1994.03.20
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Abstract

Two unknown values among three electrochemical values, i.e. electrode area, diffusion coefficient, and concentration, are simultaneously obtained by nonlinear regression analysis of a single chronoamperometric faradaic current curve at a microdisk electrode. The approach is an analytical application of the semi-empirical equation presented by Shoup and Szabo for the chronoamperometric response at a disk electrode. To demonstrate the usefulness and accuracy of this approach, the chronoamperometric current at a platinum disk electrode of 50 ${\mu}m$ radius in solutions of $Ru(NH_3)_6^{3+},\;ferrocene,\;Fe(CN)_6^{3-},\;and\;C_{60}$, were analyzed.

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