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 very slightly soluble) in common solvents. In fact, the electrochemical determination of this type of compound faces the experimental problem of establishing effective contact, allowing electron transfer between these compounds, the electrode surface, and the electrolytic solution (triple contact). The paste constituting the indicator electrode consists of a mixture of:

• graphite powder or carbon black;

• of the compound to be studied;

• a binder, which may be a non-conductive liquid, an electrolyte, or even a polymer (conductive or non-conductive).

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