Accelerating Effect of Tetramethylthiourea on the Kinetics of Zn2+ Electroreduction |
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Authors: | Jolanta Nieszporek |
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Institution: | Department of Analytical Chemistry and Instrumental Analysis, Faculty of Chemistry, Maria Curie‐Sklodowska University sq. 3, 20‐031 Lublin, Poland |
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Abstract: | The results of kinetic measurements of Zn2+ 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 Zn2+ 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 Zn2+ 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. |
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Keywords: | Accelerating effect Electroreduction Mechanistic schemes Zinc |
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