Measurement of interfacial processes at electrode surfaces with the electrochemical quartz crystal microbalance

Article Abstract:

The electrochemical quartz crystal microbalance (EQCM) is a powerful research and analytical tool for studying interfacial processes at electrode surfaces. Operating on the converse piezoelectric principle, EQCM provides a working electrode that responds to minute mass changes by corresponding changes in the frequency of induced resonant vibrations. The review lays the physical basis of its use in electrochemistry, relates the electrochemical parameters to frequency variations and discusses developments in the use of EQCM in thin films as well as in redox and conducting polymers.

Thin films, Quartz crystals, Conducting polymers, Piezoelectric devices

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Time-resolved photothermal and photoacoustic methods applied to photoinduced processes in solution

Article Abstract:

Photothermal and photoacoustic detection techniques work on the thermoelastic expansion of a medium and the sound waves it generates after radiationless deactivation of a metastable species. Their combination with ultra-short laser pulses have led to subnanosecond time resolution and accurate determination of the kinetics and energetics of reactions involving photogenerated transient species in solution. Their extreme sensitivity allows the monitoring of species at very low concentrations or of those with low absorbances, especially in fast bimolecular reactions.

Calorimetry, Photochemistry, Laser spectroscopy

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Electrochemical properties of polyoxometalates as electrocatalysts

Article Abstract:

Polyoxometalates (POMs) have been found good electrocatalysts because of their electrochemical properties that include the high stability of most of their redox potentials, the possibility to tune their redox potentials by changing the heteroions and or the addenda ions without affecting their structure, the variability of the transition metal cations and the possibility of multiple electron transfer. Functioning as electrocatalysts, POMs can reduce activation energy that allows electrode reaction at high current density.

Catalysts, Coordination compounds

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