Electrocatalytic determination of ascorbic acid using a green synthesised magnetite nano-flake modified carbon paste electrode by cyclic voltammetric method
Shashanka Rajendrachari, Gururaj Kudur Jayaprakash, Prakashaiah B.G., Mohan Kumar, B.E. Kumara Swamy
Abstract
In the present paper, aqueous extracts ofAlchemilla Vulgaris (Aslan Pençesi) leaves have been used to prepare Fe3O4 nano-flakes accompanied by calcination at 400°C. The various properties of biosynthesised Fe3O4 nano-flakes were investigated using UV–Visible, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-Ray diffraction (XRD), cyclic voltammetry, thermogravimetric (TG), and differential thermal analysis (DTA) respectively. The SEM study reveals the formation of flake-like structure with a diameter of 85 nm and a thickness of 9 nm respectively. The DTA curve shows two endothermic peaks corresponding to the decomposition of organic matter and the deoxidation of FeO (Wustite) to α-Fe, respectively, and their activation energy values were found to be 5.73 and 16.43 kJ/moles, respectively. The green synthesised magnetite nano-flakes is proved to be an excellent electrocatalyst for the electro-oxidation of ascorbic acid. The effect of scan rates, the concentration of the modifier, and the analyte was also investigated.