Nickel should behave more or less passive in alkaline solution, see e.g. Hoppe & Strehblow, Surface and Interface Analysis 14 (1989) 121-131 (doi: 10.1002/sia.740140305), and the oxidation/reduction peaks related to the formation and reduction of NiO, Ni(OH)2 and NiOOHshould appear in any case, see the attached file. If you receive additional peaks, then those may correspond to contaminations, either of the electrolyte or the Ni sample. Are you sure about the chemical composition of your sample? Do you get the same CVs for a clean Ni reference sample? Do you use a three electrode compartment for the electrochemistry? Which reference electrode do you use?

Please add some additional information, maybe then some more detailed answer is possible!

Dirk

Hi Vijaykumar.

Are u de-areating your electrolyte solution before the test? As Dr. Hecth mentioned, I would expect 3 peaks, in any case..

Does thickness play role? Why?

Hello,

Please find this attachment of paper which mentioned by Dr Dirk. Good Luck