Facile electrocatalytic oxidation of diuron on polymerized nickel hydroxo tetraamino-phthalocyanine modified glassy carbon electrodes

The facile electro-oxidation of diuron occurred at a glassy carbon electrode (GCE) modified with polymerized nickel tetraamino-phthalocyanine (NiTAPc), containing O-Ni-O bridges represented as poly-Ni(OH)TAPc-GCE. The oxidation of diuron occurred at a potential which is 60 mV less than that of poly-NiTAPc (without O-Ni-O bridges) and was accompanied by enhanced catalytic currents. The catalytic rate constant and the diffusion constant were found to be 591 x 10(2) mol(-1) Ls(-1) and 6 43 x 10(-6) cm(2) s(-1), respectively The linear concentration range of diuron was 3 0 x 10(-5) to 3 5 x 10(-4) mol L-1 with a limit of detection (LOD) of 3 3 x 10(-7) mol L-1 (3 delta notation) and a sensitivity of 12 9 A mol(-1) L cm(-2) (C) 2010 Elsevier B V All rights reserved.