Electrode materials for hydrodynamic electrodes

Choice of electrode materials depends usually on potential range in the solvent being studied and available purity. In the case of hydrodynamic electrodes, we also have to consider carefully the ease of machining in order to conform to the shapes and forms required by the theoretical equations. 

Solid electrode performance can be affected by the electrode s previous history. A freshly polished electrode surface is virtually free of functional groups. To what extent its electrochemical behaviour changes in use depends very much on the electrode material and electrochemical pretreatment procedures [98]. 

It is most common to use solid metals for hydrodynamic electrodes and it is usually possible to choose a metal which is correct for the particular application. Inert electrodes are usually of Pt, Au or Ag. In the study of electrodeposition or electrodissolution, the respective metal is employed. 

The advantage of using metallic electrodes is that they are relatively easy to shape and to polish. 

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