Fabrication of yttria dispersed duplex stainless steel electrode to determine dopamine, ascorbic and uric acid electrochemically by using cyclic voltammetry

摘要: The elemental Fe-18Cr-13Ni was mechanically alloyed in a dual drive planetary mill for 10h to prepare nanostructured duplex stainless steel powder. The prepared duplex stainless steel powder was mixed with 1wt% Y2O3 nano particles in a turbula mixer for 2h. The yttria dispersed duplex stainless steel powder was characterized by XRD, SEM and particle size analysis. Yttria dispersed duplex stainless steel powder of 2, 4, 6, 8, 10 and 12mg concentrations were modified individually with carbon paste electrode to investigate the electro catalytic response of the fabricated electrode. Yttria dispersed duplex stainless steel modified carbon paste electrode (YDMCPE) shows splendid electrochemical sensitivity towards the oxidation of dopamine (DA), ascorbic acid (AA) and uric acid (UA) than yttria free duplex and bare carbon paste electrode (BCPE). 8mg YDMCPE show maximum anodic peak current in detecting 2mM DA in 0.2 M phosphate buffer solution of pH 7.2 at scan rate 100mVs-1. We studied the effect of scan rate, effect of concentration of analyte used and the effect of pH in detecting DA, AA and UA. All the above studies depicts that YDMCPE show better electro catalytic response towards anodic oxidation of DA, AA and UA because of its fast response, reliable, material maculating resistance and stable nature.