3. Graphite paste electrode with incorporated electroactive compound

The graphite paste electrode is mainly used to study the electrochemical behavior of electroactive compounds that are strictly insoluble (or only slightly soluble) in standard solvents. In fact, the electrochemical determination of this type of compound is hampered experimentally by the problem of effective contact, enabling electronic transfer between these compounds, the electrode surface and the electrolytic solution (triple contact). The paste constituting the indicator electrode is made up of a mixture of graphite or "carbon black" powder, the compound to be studied and a binder, which may be a non-conductive liquid, an electrolyte or even a polymer (conductive or non-conductive). Readers are invited to consult the latest development by Kalcher and colleagues for further practical and theoretical details of current developments in the use of such an electrode....