Characteristics of the electrode-solution interface under faradaic and non-faradaic conditions as observed by internal reflecion spectroscopy

Nicholas Winograd, Theodore Kuwana

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Abstract

Changes in the optical absorbance in the visible spectral region as observed by internal reflection spectroscopy with transparent electrodes have been studied as a function of potential. For non-faradaic conditions this change is related to the electric charge and can be partially explained, both in wavelength and amplitude-dependence, by the variation of the optical constants as related to the free electron model. The absorbance change as a function of time during potential step has been theoretically and experimentally examined. The effect of a homogeneous chemical reaction involving the optically monitored species formed electochemically on the absorbance versus time curve is discussed quantitatively for the catalytic case.

Original languageEnglish (US)
Pages (from-to)333-342
Number of pages10
JournalJournal of Electroanalytical Chemistry
Volume23
Issue number3
StatePublished - Dec 1 1969

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Electric charge
Optical constants
Chemical reactions
Spectroscopy
Wavelength
Electrodes
Electrons

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

Cite this

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N2 - Changes in the optical absorbance in the visible spectral region as observed by internal reflection spectroscopy with transparent electrodes have been studied as a function of potential. For non-faradaic conditions this change is related to the electric charge and can be partially explained, both in wavelength and amplitude-dependence, by the variation of the optical constants as related to the free electron model. The absorbance change as a function of time during potential step has been theoretically and experimentally examined. The effect of a homogeneous chemical reaction involving the optically monitored species formed electochemically on the absorbance versus time curve is discussed quantitatively for the catalytic case.

AB - Changes in the optical absorbance in the visible spectral region as observed by internal reflection spectroscopy with transparent electrodes have been studied as a function of potential. For non-faradaic conditions this change is related to the electric charge and can be partially explained, both in wavelength and amplitude-dependence, by the variation of the optical constants as related to the free electron model. The absorbance change as a function of time during potential step has been theoretically and experimentally examined. The effect of a homogeneous chemical reaction involving the optically monitored species formed electochemically on the absorbance versus time curve is discussed quantitatively for the catalytic case.

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