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Spectroelectrochemistry – Electrochemistry – Application Note 52

Latest updated: May 6, 2020

Abstract

The tandem application of spectroscopy to electrochemistry can be carried out either ex-situ or in situ. In some cases, the ex-situ method may be of limited use, in that something could change upon removing the sample from the electrolytic solution under the control of the working potential. This possible drawback can be circumvented by in situ spectro-electrochemistry, in which the measurement is carried out simultaneously with the redox change. On the other hand, while ex-situ measurements do not require a special spectroscopic apparatus, in situ experiments need special cells designed as the best compromise between the requirements of spectroscopic and electrochemical techniques, which do not always coincide. A reasoned settlement concerning the size of the cell, the electrode geometry, the choice of the supporting electrolyte and the sample concentration is critical. Therefore, many different cell designs and optically transparent electrodes developed for specific spectroscopic methods are described in the literature.

In this application note, the use of a unique thin layer spectro-electrochemical cell is presented. Initially, experimental information about the setup is presented. Then, the specificity of the thin layer cell is discussed. Finally, UV-Vis and IR measurements are shown.

 

Introduction

The tandem application of spectroscopy to electrochemistry can be done either ex-situ or in situ. In some cases, the ex situ method may be of limited use, in that something could change upon removing the sample from the electrolytic solution under the control of the working potential. This possible drawback can be circumvented by in situ spectroelectrochemistry, in which the measurement is carried out simultaneously with the redox change. On the other side, while ex-situ measurements do not require special spectroscopic apparatus, in situ experiments need special cells planned at the best compromise between the requirements of spectroscopic and electrochemical techniques, which do not always coincide. A reasoned settlement concerning the size of the cell, the electrode geometry, the choice of the supporting electrolyte and the sample concentration is critical, consequently, many different cell designs and optically transparent electrodes developed for specific spectroscopic methods are described in the literature [1].

 

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