Estimation of the Concentration-Distance Profile within the Electrochemical Diffusion Layer by Raman Microprobe Spectroscopy

Abstract

Knowledge of the concentration-distance profile in the region of space extending between an electrode surface and the bulk of the solution is essential for the understanding of electrode processes. Properties within the diffusion layer, stretching from the inner layer to the bulk of the solution, differ from those of the bulk. The concentration gradient in the diffusion layer has been measured by Raman microprobe spectroscopy. This method has the advantage that it is molecular specific i.e., the Raman spectrum is unique to the species being detected. The ferricyanide/ferrocyanide couple is used as an illustration. Major concentration depletion and accumulation was found in the volume extending from the surface of a gold electrode to 0.2 mm. (kt)

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Document Details

Document Type
Technical Report
Publication Date
Mar 08, 1990
Accession Number
ADA219521

Entities

People

  • Donald E. Irish
  • Toru Ozeki

Organizations

  • University of Guelph

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Abstracts
  • Chemistry
  • Cyanides
  • Diffusion
  • Electrodes
  • Engineering
  • Laser Beams
  • Lasers
  • Light Sources
  • Measurement
  • Microprobes
  • Military Research
  • Optical Properties
  • Raman Spectra
  • Refractive Index
  • Spectra
  • Spectroscopy

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Powder metallurgy of Titanium alloys.
  • Systems Analysis and Design

Technology Areas

  • Space
  • Space - Hall-Effect Thruster