Electrochemical and quartz crystal microbalance evidence for mediation and direct electrochemical reactions of small molecules at tetrathiafulvalene-te

Michael S. Freund, Anna Brajter-Toth, Michael D. Ward

Research output: Contribution to journalArticle

Abstract

Rotating disk electrode experiments were used to investigate the electrochemical kinetics of ferricyanide, ascorbic acid and catechol in 0.5 M sodium phosphate buffer (pH 7) at TTF-TCNQ electrodes. Apparent transfer coefficients (α) of approximately 0.3 were obtained for the oxidation of ascorbic acid and catechol, and suggest that the oxidation may involve heterogeneous catalysis at the TTF-TCNQ electrode surface. For ferricyanide α = 0.5, indicating direct electron transfer. The behavior of the surface was subsequently characterized using in situ quartz crystal microbalance (QCM) measurements. QCM results suggest that a TCNQ0 rich surface is being produced throughout most of the potential window used during rotating disk electrode experiments. A mechanism is proposed which can account for the low apparent transfer coefficient and which involves TCNQ0.

Original languageEnglish (US)
Pages (from-to)127-141
Number of pages15
JournalJournal of Electroanalytical Chemistry
Volume289
Issue number1-2
DOIs
StatePublished - Aug 24 1990

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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