Electrocatalytic Response of Duplex and Yittria Dispersed Duplex Stainless Steel Modified Carbon Paste Electrode in Detecting Folic Acid Using Cyclic Voltammetry

摘要

Duplex stainless steel of elemental composition Fe-18Cr-13Ni was mechanically alloyed in dual driveplanetary ball mill for 10h. Milled powder sample was characterized by X-Ray diffraction, scanningelectron microscope and high resolution electron microscope to study the morphology, lattice spacingand phases formed after milling for 10h. Then 1wt% Y2O3 nano particles were dispersed in duplexstainless steel powder by mixing the composition for 2h in turbula mixer. Caron paste electrode wasmodified with yittria free and yittria dispersed duplex stainless steel respectively to study theirelectrocatalytic behavior in detecting folic acid. We determined optimum concentration of both themodifiers which show maximum anodic peak current in determining the folic acid. Among all, 8mgYittria dispersed duplex stainless steel modified carbon paste electrode showed maximum currentsensitivity than 4mg yittria free duplex stainless steel modified carbon paste electrode in 2mM folic-1 acid concentration and 0.2M phosphate buffer solution of pH 7.2 at scan rate 100mVs . We reportedthe effect of scan rate, concentration of folic acid and pH effect on oxidation peak of folic acid in boththe modified carbon electrodes. Plot of all the above effects shows linear relationship and theirelectrode reactions were adsorption controlled. We successfully fabricated reliable, stable and fastresponse electrochemical sensor to detect folic acid.