Electrochemical NanoScience Group
‹— Methodological and Instrumental Developments | ‹— Research topics

Surface-enchanced infrared reflection-absorbtion spectroscopy(SEIRAS)

In situ Fourier Transform Infrared Spectroscopy is applied to obtain vibronic and chemical information of structures and processes in the electrochemical double layer (interfacial water, anions, functionalized adlayers) to identify ions and molecules and to explore pathways of electrocatalytical reactions. We focus on two complementary approaches: (1) external reflection/adsorption (IRAS) employing well-defined massive single crystals in the so-called thin layer configuration, and (2) Surface Enhanced Infrared Spectroscopy (SEIRAS) with quasi-single crystalline metal films deposited on high refractive materials in an attenuated total reflection geometry. The later configuration enables undistorted time-resolved studies up to 5 ms time resolution at well-defined, potential-controlled solid/liquid interfaces, and was, for instance, applied in steady state and time resolved studies of the Au(111-20nm)/electrolyte interface and of structural transitions in ordered adlayers of 4,4'-bipyridine or uracil. Based on our knowledge and experience in electrochemical studies with well-defined single crystal electrodes we are currently focussed on developing the ATR-SEIRAS experiment for real-time, fuel cell-relevant electrocatalytical application with functionalized bimetallic film electrodes.
Revised: 10.12.2007     ©: 2005-2007