NDLI: Kinetics of nickel electroplating from methanesulfonate electrolyte

Content Provider	Springer Nature Link
Author	Danilov, F. I. Sknar, I. V. Sknar, Yu. E.
Copyright Year	2011
Abstract	The overpotential of nickel ion electroreduction on the nickel and mercury electrodes is shown to increase in the following sequence of anions: ClO 4 − ,CH$_{3}$SO 3 − , SO 4 2− . On the nickel electrode, the overpotential of nickel evolution decreases as the pH$^{v}$ increases from 1.5 to 4. This is associated with the increase in pH$^{s}$ as the result of a parallel reaction of hydrogen evolution. It is shown that in contrast to mercury, the Tafel plots of the nickel electrode demonstrate a bend corresponding to the change in their slope from −0.044 to −0.132 V. This is accompanied by the lowering down of the reaction order in nickel ions from 2 to 1. A mechanism of nickel ion electroreduction that includes two parallel routes is proposed and substantiated by a model. In the low overpotential range, the predominant process is the electroreduction of nickel hydroxocomplexes, which is characterized by the strong dependence of the reaction rate on the potential and the concentration of electroactive species. For high overpotentials, the predominant process is the direct discharge of nickel aquacomplexes the rate of which depends weaker on the potential and the concentration of electroactive species.
Starting Page	1035
Ending Page	1042
Page Count	8
File Format	PDF
ISSN	10231935
Journal	Russian Journal of Electrochemistry
Volume Number	47
Issue Number	9
e-ISSN	16083342
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-10-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	nickel ions electroreduction mechanism overpotential methanesulfonate electrolyte Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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