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Kinetics and Mechanism of Zn(II) Ions Electroreduction Catalyzed by Organic Compounds
Author(s) -
Dalmata G.
Publication year - 2005
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.200403154
Subject(s) - chemistry , electron transfer , adsorption , catalysis , perchlorate , inorganic chemistry , ion , kinetics , rate determining step , reaction mechanism , electrode , photochemistry , organic chemistry , physics , quantum mechanics
The paper describes the results of the studies of organic substances catalytic activity on Zn(II) ions electroreduction on mercury in perchlorate solutions. Zn(II) ions electroreduction in the presence of catalyzing substance proceeds in two one‐electron stages. The first electron transfer is the stage determining the process rate. All catalyzing substances increase the rate of first electron transfer. The acceleration effect is connected with the stability of active complexes formed on the electrode surface. The rate of the second electron transfer depends mainly on the adsorption of the catalyzing substance on the electrode surface – of the surface excess and the structure of the adsorption layer. Hence the second electron transfer can be inhibited or catalyzed. The mechanism of the organic substance catalytic activity is also given.