Voltammetric Measurement of Biomolecular Electron-Transfer Rates in Low Ionic Strength Solutions

Abstract

Numerical analysis of the sequential electron-transfer mechanism, A yields A+ + e-, A+ yields A2+ + e- demonstrates that the rate at which A can be directly oxidized to A2+ is inhibited in low ionic strength solutions by the coupled diffusion-migration of chemically-generated A+. The latter species, A+ is produced within the depletion layer by the homogenous reaction, A + A2+, and is electrostatically repelled from electrode surface, thereby reducing the flux of A at the electrode surface. Steady-state voltammetric currents corresponding to two examples of this reaction mechanism, the oxidation of tetrathiafulvalene (TTF) and the reduction of tetracyanoquinodimethane (TCNQ), have been measured at platinum microdisk electrodes over a wide range of electrolyte concentrations (0-0.1M).

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 16, 1990
Accession Number
ADA229918

Entities

People

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

Organizations

  • University of Minnesota

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Compounds
  • Chemical Engineering
  • Chemical Reactions
  • Chemistry
  • Computers
  • Electrochemistry
  • Electrodes
  • Electron Transfer
  • Mass Transfer
  • Materials
  • Materials Science
  • Military Research
  • Molecular Sieves
  • Numerical Analysis
  • Photoelectrochemical Cells
  • Platinum
  • Reaction Mechanisms

Fields of Study

  • Chemistry

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Electrochemical Surface Science
  • Polymer Science and Technology

Technology Areas

  • Microelectronics