Catalytic evolution of hydrogen on a mercury electrode in cyclic voltammetry and its analytical application

• Published in: Journal of electroanalytical chemistry and interfacial electrochemistry 1983-01, Vol.144 (1), p.1-10
• Main Authors: Toropova, V.F., Budnikov, H.C., Ulakhovich, N.A., Medyantseva, E.P.
• Format: Article
• Language: English
• ISSN: 0022-0728
• DOI: 10.1016/S0022-0728(83)80139-9

This review deals with electrochemical processes in solutions of complex compounds followed by catalytic hydrogen evolution. Processes mentioned are divided into two principal groups depending on the oxidation state of the central atom. In the electrochemical reactions of the first group protonation of the complex with the central atom in the oxidation state (mostly 2 +) is the initial stage of the electrode process. When the oxidation state of the central ion is 3 +, a reversible one-electron diffusion reduction wave as a rule precedes the catalytic hydrogen wave. Electrochemical reactions followed by catalytic hydrogen liberation in a more negative range of potentials (mainly in alkaline solutions) form the second group of catalytic processes. A metal complex in the zero-valence stage is responsible for the catalytic effect. The latter data can be used by cyclic voltammetry with a stationary electrode. Analytical application is discussed.