Abstract
Infrared spectroscopic studies on the double layer structure at the electrode | electrolyte interface are reviewed. There are three approaches to investigate the interfacial structure, i.e., non situ, ex situ and in situ methods. Infrared reflection absorption spectra (IRAS) obtained on model structures constructed non situ under UHV condition are helpful to understand the potential-dependent change in adlayer structure in the electrolyte solution. Recent studies on the interfacial water molecule using in situ infrared spectroscopic techniques are also quoted briefly.
