Preparation of Pt/MWCNTs Catalyst by Taguchi Method for Electrooxidation of Nitrite

The Pt nanoparticles-functionalized multiwall carbon nanotubes (f-MWCNTs) modified glassy carbon electrodes were used to study the electrooxidation of nitrite. Pt nanoparticles were electrodeposited on the f-MWCNTs modified glassy carbon (GC) electrode by applying a constant potential to the electrode for a specific time. By applying optimized conditions (using Minitab software), Pt/MWCNTs/GC electrode was prepared by immobilizing 40 mu L of f-MWCNTs on the GC electrode and applying a potential of-0.20 V vs. Ag/AgCl for 120 s. The electrooxidation of nitrite was studied on the prepared electrode in 0.1 M KCl solution. The amperometric response of the prepared electrode linearly changes with the concentration of nitrite from 4.0 mu M to 2.4 mM. The detection limit of the electrode was found to be 1.5 mu M (S/N = 3) with a sensitivity of 28.7 mu A/mM.