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Cyclic voltammetry involving amalgam formation at mercury film microelectrodes
Author(s) -
Ciszkowska Malgorzata,
Penczek Martin,
Stojek Zbigniew
Publication year - 1990
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140020306
Subject(s) - mercury (programming language) , microelectrode , cyclic voltammetry , cathodic protection , electrode , materials science , analytical chemistry (journal) , anode , voltammetry , chemistry , electrochemistry , inorganic chemistry , chromatography , computer science , programming language
Cyclic voltammetry involving amalgam formation at mercury microelectrodes is described experimentally and theoretically for reversible systems. Silver microdisks were used to support the mercury deposit during the preparation of electrodes. The ratio of the mercury film thickness to the disk radius is much lower than 1 (e.g., a 1 μm thick layer of Hg on a silver disk with a radius of 15 μm) justifies the name mercury film microelectrode. When the substrate is present in the solution, the original shape of the cyclic voltammograms (one or more cathodic waves followed by one or more anodic symmetrical peaks) is the result of the combination of spherical diffusion in the solution and restricted diffusion in the mercury film. When the substrate is present initially in the mercury phase, an anodic symmetrical peak is followed by a negligibly small cathodic peak. The alternate dimension implicit and the alternate direction Galerkin methods were used in the calculations.