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Abstract
In this dissertation, nickel oxide nanoparticles (nano-NiOx) of peculiar shape are prepared by sol-gel technique and its electrocatalytic activity towards glucose oxidation is evaluated at different conditions of temperature and loading extent of nano-NiOx. The thus prepared nanoparticles are annealed at three different temperatures, i.e., 200, 400 and 600 oC. Nano-NiOx are subjected to surface analysis techniques such as field emission scanning electron microscopy (FE-SEM), high resolution transmission electron micrograph (TEM) and X-ray diffraction (XRD). Electrochemical characterizations are performed using cyclic voltammetry. The effects of annealing temperature on the morphological structure, surface concentration and subsequently on the electrochemical properties of nano-NiOx are examined. Experimental results indicate that the grain size and electrochemical characteristics of the nano-NiOx are significantly affected by increasing of the annealing temperature. The electrocatalytic oxidation of glucose at nano-NiOx modified glassy carbon (nano-NiOx/GC) electrode is significantly enhanced especially at nano-NiOx/GC electrode with nano-NiOx prepared by annealing at 200 oC compared to that annealed at 400 and 600 oC. Nano-NiOx is believed to play a crucial role as a catalytic mediator to facilitate the charge transfer during the oxidation of glucose physical