Abstract
The reduction of Zn(II) has been studied by means of the faradaic impedance method in wide potential and frequency ranges and at varied water activity. The results obtained could be quantitatively explained on the assumption of a mechanism including at least the following consecutive steps: 1. (1) fast partial dehydration of the electroactive species; 2. (2) fast transport from the solution into the double layer; 3. (3) slow transfer of the first electron; 4. (4) a fast second partial dehydration step; 5. (5) slow transfer of the second electron. The hydration number of the Zn 2+ ions in the solution was obtained from the shift of E 1 2 r and E ox with water activity, and was found to agree fairly well with the results obtained from the kinetic study.
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