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.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Chemical Engineering(all)