Hydrodynamic electrodes in the investigation of coupled homogeneous reactions

7 Hydrodynamic electrodes in the investigation of coupled homogeneous reactions 

In Section 6.9 the schemes of some mechanisms involving coupled homogeneous reactions, namely EC, CE, and C E, were shown. Hydro-dynamic electrodes are useful in the study of these mechanisms owing to 

Instead of presenting the equations for these cases, which can be consulted in the literature1, we consider a mechanism where the double electrode is very valuable, that is in the ECE mechanism, the chemical step being of first or second order18. Schematically for a double electrode, one has 

The fraction of species B obtained at the detector electrode is Nk, the kinetic collection efficiency. An example of a first-order reaction is the bromination of anisole19, and of a second-order reaction the bromination of some proteins20. 

Experimentally, as for the steady-state collection efficiency, the generator electrode current is controlled and the potential of the detector electrode is held at a value corresponding to mass-transport-limited conversion of B to C. 

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