Nickel ferrocyanide modified electrodes as active cation-exchange matrices: Real time xrd evaluation of overlayer structure and electrochemical behavior

Michael T. Kelly, Georgia A. Arbuckle-Keil, Lois A. Johnson, Evangeline Y. Su, Linda J. Amos, Jonathan K.M. Chun, Andrew B. Bocarsly

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Abstract

The dynamic variations in the structure of nickel ferrocyanide modified electrodes was determined using in situ diffractoelectrochemical techniques. X-ray powder diffraction peaks from the nickel ferrocyanide modified electrode were recorded during electrochemical oxidation/reduction of the surface overlayer and reversible changes in the unit cell lattice parameter observed. The electrochemical changes that occur during oxidation/reduction in various alkali cation electrolytes are correlated with changes in the lattice parameter. It is postulated that micro-domains form when two cations having markedly different radii such as cesium and potassium are intercalated into the nickel ferrocyanide structure so that distinct regions of the nickel ferrocyanide layer containing cesium exist separated from regions with the lighter alkali cations.

Original languageEnglish (US)
Pages (from-to)311-321
Number of pages11
JournalJournal of Electroanalytical Chemistry
Volume500
Issue number1-2
DOIs
Publication statusPublished - Mar 16 2001

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All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

Keywords

  • Chemically modified electrode
  • In situ diffractoelectrochemistry
  • Nickel ferrocyanide
  • X-ray powder diffraction

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