Analysis of Voltammetric Half-Wave Potentials in Low Ionic Strength Solutions and Voltammetric Measurement of Ion Impurity Concentrations

Abstract

An analytic equation is presented that allows the prediction of steady-state voltammetric half-wave potentials as a function of electrolyte concentration in low ionic strength solutions for electrodes of arbitrary geometry and size. The equation is tested for the oxidation of ferrocene and reduction of TCNQ in acetonitrile at 2.4 - 22.1 micron platinum microdisk electrodes for electrolyte (tetra-n-butylammonium perchlorate) concentrations between 0.1 and 4 x 10 to the - 9th power M, and in acetonitrile solutions containing no intentionally added electrolyte. An analytical method for measuring ion impurity concentration, based on steady-state microelectrode voltammetry, is proposed and used to measure ionic impurities in acetonitrile.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1990
Accession Number
ADA229908

Entities

People

  • Bradford D Pendley
  • Henry S. White
  • Héctor D. Abruña
  • John D. Norton
  • Wendy E. Benson

Organizations

  • Cornell University

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  • Chemical Compounds
  • Chemical Engineering
  • Chemical Synthesis
  • Chemistry
  • Diffusion Coefficient
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  • Electrochemical Cells
  • Electrochemical Reactions
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  • Electrodes
  • Equations
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  • Materials
  • Materials Science
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  • Control Systems Engineering.
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  • Materials Science and Engineering.