Cyclic Voltammetry: Ferro/Ferricyanide, fact and fiction

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The ferro/ferricyanide couple is a favourite choice in the laboratory to introduce students to cyclic voltammetry. This is largely due to a


Cyclic Voltammetry of Hexachloroiridate(IV): An Alternative to the Electrochemical Study of the Ferricyanide Ion, Steven Petrovic, Chemical Educator 5, 231-235, 2000.

describes an alternative to the use of ferri/ferrocyanide for educational cyclic voltammetry experiments in aqeuous solution.. While iridium salts are very expensive only tiny quantities are required for cyclic voltammetry.

The other paper talks about some of the problems with ferricyanide. Infrared Spectroelectrochemical Analysis of Adsorbed Hexacyanoferrate Species Formed during Potential Cycling in the Ferrocyanide/ Ferricyanide Redox Couple, Christine M. Pharr and Peter R. Griffith, Analytical Chemistry, 69, 4673-4679, 1997.

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