In situ Spectroelectrochemistry Via Infrared Techniques

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Abstract
Spectroscopic studies of electrode processes at molecular level are necessary both for a more detailed understanding of the fundamental electrochemical reactions involved and for the development of better electrode materials. Such investigations require molecular-specific, non destructive surface analytical techniques capable of analyzing solid-liquid interfaces in situ, without changing the structure of the often unstable reaction products during the measurements. It has been demonstrated previously that IR-spectroscopy fulfills these requirements. Recently, the development of FTIR-spectrometry provides the sensitivity and speed necessary to study also shortliving intermediates generated in a spectroelectrochemical cell during potentiodynamic measurements. This paper deals with the advantages and limi-tations of the different IR-spectroscopic reflection techniques developed and applied since 1980 for the in situ study of metal and organic polymer electrodes in contact with aaueous and non aqueous electrolytes (external reflection techniques, internal reflection technique) . Special emphasis is placed on recent combined electrochemical and FTIR-ATR-spectroscopic investigations on polythiophene, poly-3-methylthiophene and polybithiophene.

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