Voitammetric and Electrochromic Behavior of N-Heptylviologen on Chemically Modified Metal Oxide Electrodes

R. C. Cieslinski, N. R. Armstrong

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

Voltammetric and spectroelectrochemical results are presented for the one-electron reduction of n-heptylviologen dibromide on clean and silanemodified, tin oxide, and on indium tin oxide metallized-plastic optically transparent electrodes (MPOTE). The amount of n-heptylviologen dibromide reduced and the rate of coloration due to the formation of the cation-radical film can strongly be influenced by the state of the electrode surface. The initial 200-500 msec of viologen deposition are not mass transport controlled. Calculations for the amount of viologen deposited vary, depending on whether a spectrophotometric or coulometric estimated is used. Spectrophotometric data indicate that the amount of viologen deposited in the first 200 msec of chronoamperometric reduction from a concentrated viologen solution is ca. 10-14 monolayers and is increased at least 60% by the addition of a monolayer of the silane modifier to the electrode surface. In the case of the metallized plastic films, the increase in coloration rate may be attributed to the presence of nonpolar surface groups present at the surface of the conductive film.

Original languageEnglish (US)
Pages (from-to)2605-2610
Number of pages6
JournalJournal of the Electrochemical Society
Volume127
Issue number12
DOIs
StatePublished - Dec 1980

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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