Nickel hydroxide is a very significant material from fundamental as well as technological application point of view. It has several technological applications in engineering, particularly its use as the active material in the positive electrode of rechargeable batteries. It is also used as a common precursor for synthesizing hydrogenation catalyst nickel oxide. The aqueous solution of Ni(NO3)2.6H2O and NaOH are used as precursor. In this report, we have synthesized nickel hydroxide nanoparticles using a simple chemical precipitation method and varied the molarity of Ni(NO3)2.6H2O precursor of 0.4, 0.6 and 0.8M. The synthesized Ni(OH)2 nanoparticle was studied using several characterizations. From XRD analysis, with the increase of molarity of Ni(NO3)2.6H2O the average crystallite size was found to be increased. Accordingly with the increase in average crystallite size, the bandgap of prepared Ni(OH)2 decreases from 2.66 eV to 2.58 eV. The change in physical properties of prepared Ni(OH)2 nanoparticles was discussed in terms of the molarity variation of the solution. The present study reports the change in physical properties of Ni(OH)2 by change in basic synthesis parameter and the reported results might be useful to assess the material as an active electrode to improve the performance of batteries.

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