Fabrication, electrochemical characteristics and electrocatalytic activity of 4-((2-hydroxyphenylimino)methyl)benzene-1,2-diol electrodeposited on a carbon nanotube modified glassy carbon electrode as a hydrazine sensor

This paper is a study of the fabrication, electrochemical characteristics, and electrocatalytic activity of 4-((2-hydroxyphenylimino)methyl)benzene-1,2-diol electrodeposited on a multi-walled carbon nanotube modified glassy carbon electrode (HPIMBD–MWCNT-GCE) as a hydrazine sensor. Cyclic voltammetric, chronoamperometric, and amperometric methods were used to probe the fabrication, and characterization of the modified electrode and its role as a sensor in the electrocatalytic determination of hydrazine. The cyclic voltammograms of HPIMBD–MWCNT-GCE show one pair of peaks with surface confined characteristics. The charge transfer coefficient, α, and the charge transfer rate constant, ks, between electrodeposited HPIMBD and MWCNT-GCE were calculated at various pHs. The results show that the modified electrode exhibited a catalytic activity toward the electrooxidation of hydrazine. The catalytic rate constant of the hydrazine oxidation at the modified electrode surface was determined using cyclic voltammograms recorded at various potential scan rates. Furthermore, amperometry exhibits two linear dynamic ranges of 4.0–32.9 μM and 32.9–750.4 μM and a detection limit of 1.1 μM for hydrazine determination. Finally, the activity of the modified electrode was studied for hydrazine determination in tap water and in auxiliary cooling water of power generation and satisfactory results were obtained.