Electrocatalytic Oxidation of Glucose at Nickel Phosphate Nano/Micro Particles Modified Electrode

Abstract

Here is a first study of the electrocatalytic oxidation of glucose by nickel phosphate nano/micro particles (NiPh) modified glassy carbon electrode (NiPh/GC). The NiPh is fabricated by a simple reflux method. The morphology and structure of the NiPh particles have been studied using field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), BET surface area measurement and Fourier transfer Infrared spectroscopy (FTIR). According to the above measurements, a needle-like morphology with average particle dimensions of 200 × 800 nm is obtained. The phase structure of the NiPh particles is found to be Ni3(PO4)2.8H2O and having BET surface area of 20.0 m2/g. Electrochemical measurements like cyclic voltammetry (CV) are used to characterize the NiPh/GC electrode. Potential cycling in the range of −0.1 to 0.7 V (Ag/AgCl/KCl(sat)) is used to activate the phosphate matrix. After ~75 cycles, two redox peaks are emerged which were assigned for the redox transform NiPh (II)/NiPh (III) due to invasion of the OH− ions into the NiPh matrix. The NiPh/GC demonstrates electrocatalytic activity towards glucose oxidation in alkaline solution. The glucose reaction is analyzed and characterized in the light of the collected experimental data.