Nano-Structured Ni(II)–Baicalein Modified Multiwall Carbon Nanotube Paste Electrode for the Electrocatalytic Oxidation of Hydroxylamine

Abstract

A nano-structured Ni(II)–baicalein(BA) film is electrodeposited on a multiwall carbon nanotube paste electrode in alkaline solution. The modified electrode shows electrocatalytic activity toward the oxidation of hydroxylamine. Kinetic parameters such as the electron transfer coefficient α, rate constant k s of the electrode reaction and the catalytic rate constant k cat of the catalytic reaction are determined. The catalytic currents present linear dependence on the concentration of hydroxylamine from 2.5×10 -6 mol•L -1 to 4.0×10 -4 mol•L -1 by amperometry. The detection limit and sensitivity are 6.0×10 -7 mol•L -1 and 31.2 mA•L•mol -1 , respectively. The modified electrode has been applied to determine hydroxylamine in water samples with satisfactory results.