The Effect of Anodic Surface Treatment on the Oxidation of Catechols at Ultrasmall Carbon Ring Electrodes

Abstract

Electrochemical anodic treatment at ultrasmall carbon ring electrodes appears to result in the formation of an oxide film which displays charge- selective and pH dependent enhancement in the pH 7.4 citrate-phosphate buffer is more Nernstian for dopamine (DA) and less Nernstian for 3,4- dihydroxyphenylacetic acid (DOPAC). However, oxidation in pH 2.8 buffer gives rise to voltammetry which is less Nernstian for both DA and DOPAC. Extensive surface oxidation in potassium hydroxide apparently forms a thick layer which acts like a thin layer reservoir for adsorbed analyte. Voltammetry following extensive treatment is attenuated and peak shaped. Minimal surface oxidation in KOH results in more Nernstian sigmoidal voltammetry with only slight current attenuation. The data suggest that an oxide layer formed following anodic treatment is non-uniform and leaves sites of activated carbon exposed on the surface.

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Document Details

Document Type
Technical Report
Publication Date
Jul 09, 1991
Accession Number
ADA238794

Entities

People

  • Andrew G Ewing
  • Harvey A. Fishman

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Buffers (Chemistry)
  • Carbon Fibers
  • Charge Transfer
  • Chemistry
  • Computer Simulations
  • Electrochemical Cells
  • Electrodes
  • Electron Transfer
  • Graphitic Materials
  • Military Research
  • Oxide Films
  • Oxides
  • Steady State
  • Surface Finishing
  • United States
  • Universities
  • Waveform Generators

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