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Accelerating Effect of Tetramethylthiourea on the Kinetics of Zn 2+ Electroreduction
Author(s) -
Nieszporek Jolanta
Publication year - 2012
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.201200207
Subject(s) - tafel equation , chemistry , electron transfer , adsorption , inorganic chemistry , kinetics , ion exchange , dropping mercury electrode , ion , two step , electrode , rate determining step , electrochemistry , catalysis , combinatorial chemistry , organic chemistry , physics , quantum mechanics
The results of kinetic measurements of Zn 2+ electroreduction on mercury electrode in the presence of tetramethylthiourea showed the two‐step character of the electrode process. The acquisition of nonlinear wide potential range Tafel plots was found to offer a good opportunity to examine the Zn 2+ electroreduction mechanism. Three mechanisms including the ion transfer step followed by the electron exchange step (IE mechanism), the adsorption step (IA mechanism) and the chemical step followed by electron transfer (CE) were applied. The accelerating influence of tetramethylthiourea on Zn 2+ electroreduction was found to result from possible complexes formation in the diffuse layer. The ion transport step is probably combined with the loss or exchange of a ligand. The second step probably consists in the electron transfer or adsorption process connected with partial charge transfer.