Simultaneous electrochemical and piezoelectric microgravimetry measurements of C60 films with a quartz crystal microbalance in a dimethylformamide-water mixed solvent solution containing potassium ions

Á Szucs, M. Novák

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Simultaneous electrochemistry and piezoelectric microgravimetry studies using electrochemical quartz crystal microbalance were carried out on solution cast C60 films. These films could be reduced in dimethylformamide + water mixture containing potassium ions. It was established that the first reduction was a completely surface-confined process, while the second reduction produced dissolved species. Restricting the potential range only to the first reduction, we could observe reversible electrochemical transformation of the films. Measuring the mass changes of the electrodes during the electrochemical processes, we found that the "simple" voltammograms (single reduction and oxidation peaks) actually cover simultaneous processes. Both the reduction and the oxidation involved the movements of anions, cations and solvent molecules in and out of the films. It was measured that the initial behavior of the films varied "randomly", probably depending on the unpredictable structure of the film produced by solution casting. However, the films adjusted themselves to the experimental conditions displaying "steady-state" behavior after a certain number of potential scans. This "steady- state" behavior could be reached independently of the original structure, or the amount of C60 put on the surface, but it could be perturbed easily by altering the conditions. The films were self-adjusted to the measurements.

Original languageEnglish
Pages (from-to)304-311
Number of pages8
JournalJournal of Solid State Electrochemistry
Volume9
Issue number5
DOIs
Publication statusPublished - May 2005

Fingerprint

Dimethylformamide
Quartz crystal microbalances
quartz crystals
microbalances
Potassium
potassium
Ions
Water
water
ions
Oxidation
oxidation
Electrochemistry
electrochemistry
Anions
Cations
casts
Casting
Negative ions
Positive ions

Keywords

  • C films
  • Electrochemistry
  • Quartz crystal microbalance
  • Self-adjustment

ASJC Scopus subject areas

  • Electrochemistry
  • Electrical and Electronic Engineering
  • Chemical Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)
  • Materials Science (miscellaneous)

Cite this

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N2 - Simultaneous electrochemistry and piezoelectric microgravimetry studies using electrochemical quartz crystal microbalance were carried out on solution cast C60 films. These films could be reduced in dimethylformamide + water mixture containing potassium ions. It was established that the first reduction was a completely surface-confined process, while the second reduction produced dissolved species. Restricting the potential range only to the first reduction, we could observe reversible electrochemical transformation of the films. Measuring the mass changes of the electrodes during the electrochemical processes, we found that the "simple" voltammograms (single reduction and oxidation peaks) actually cover simultaneous processes. Both the reduction and the oxidation involved the movements of anions, cations and solvent molecules in and out of the films. It was measured that the initial behavior of the films varied "randomly", probably depending on the unpredictable structure of the film produced by solution casting. However, the films adjusted themselves to the experimental conditions displaying "steady-state" behavior after a certain number of potential scans. This "steady- state" behavior could be reached independently of the original structure, or the amount of C60 put on the surface, but it could be perturbed easily by altering the conditions. The films were self-adjusted to the measurements.

AB - Simultaneous electrochemistry and piezoelectric microgravimetry studies using electrochemical quartz crystal microbalance were carried out on solution cast C60 films. These films could be reduced in dimethylformamide + water mixture containing potassium ions. It was established that the first reduction was a completely surface-confined process, while the second reduction produced dissolved species. Restricting the potential range only to the first reduction, we could observe reversible electrochemical transformation of the films. Measuring the mass changes of the electrodes during the electrochemical processes, we found that the "simple" voltammograms (single reduction and oxidation peaks) actually cover simultaneous processes. Both the reduction and the oxidation involved the movements of anions, cations and solvent molecules in and out of the films. It was measured that the initial behavior of the films varied "randomly", probably depending on the unpredictable structure of the film produced by solution casting. However, the films adjusted themselves to the experimental conditions displaying "steady-state" behavior after a certain number of potential scans. This "steady- state" behavior could be reached independently of the original structure, or the amount of C60 put on the surface, but it could be perturbed easily by altering the conditions. The films were self-adjusted to the measurements.

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