Electrocatalytic hydrazine oxidation on quinizarine modified glassy carbon electrode

• Published in: Electrochimica acta Vol. 52; no. 20; pp. 6118 - 6124
• Main Authors: Ardakani, Mohammad Mazloum, karami, Payam Ebrahimi, Rahimi, Parvaneh, Zare, Hamid Reza, Naeimi, Hossein
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 10.06.2007; Elsevier
• Subjects: Chemistry; Electrocatalytic; Electrochemistry; Exact sciences and technology; General and physical chemistry; Glassy carbon; Hydrazine; Kinetics and mechanism of reactions; Modified electrode; Quinizarine; Electrocatalytic; Hydrazine; Quinizarine; Modified electrode; Glassy carbon; Phosphates; Acidic solution; Inorganic compound; Electrodes; Electrocatalysis; Reaction mechanism; pH; Electrodeposition; Oxidation; Chronoamperometry; Electrochemical reaction; Modified material; Anthraquinone derivatives; Quinone; Buffer solution; Carbon; Quinizarin; Medium effect; Kinetics; Glassy state
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2007.03.065

The electrocatalytic oxidation of hydrazine has been studied on glassy carbon modified by electrodeposition of quinizarine, using cyclic voltammetry and chronoamperometry techniques. It has been shown that the oxidation of hydrazine to nitrogen occurs at a potential where oxidation is not observed at the bare glassy carbon electrode. The apparent charge transfer rate constant and transfer coefficient for electron transfer between the electrode surface and immobilized quinizarine were calculated as 4.44 s −1 and 0.66, respectively. The heterogenous rate constant for oxidation of hydrazine at the quinizarine modified electrode surface was also determined and found to be about 4.83 × 10 3 M −1 s −1. The diffusion coefficient of hydrazine was also estimated as 1.1 × 10 −6 cm 2 s −1 for the experimental conditions, using chronoamperometry.