Elaboration of carbon paste electrode containing pentadentate Nickel-(II) Schiff base complex: Application to electrochemical oxidation of thiosulfate in alkaline medium |
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| Institution: | 1. Laboratoire d’énergétique et électrochimie des solides (LEES), Faculté de Technologie, Université Ferhat Abbas-Sétif-1, Route de Béjaia, Sétif 19000, Algeria;2. Laboratoire d''Electrochimie, d''Ingénierie Moléculaire et de Catalyse Redox (LEIMCR), Faculté de Technologie, Université Ferhat Abbas-Sétif-1, Route de Béjaia, Sétif 19000, Algeria;3. Laboratoire de Préparation, Modification et Application des Matériaux Polymériques Multiphasiques (LMPMP), Faculty of Technology, University of Ferhat ABBAS SETIF-1, Sétif 19000, Algeria;4. Instituto de Ciencia y Tecnología de Polímeros (ICTP-CSIC), c/Juan de la Cierva 3, Madrid 28006, Spain |
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| Abstract: | A Nickel Schiff base complex, insoluble in water, was synthesized and used as modifier. A Nickel Schiff base modified carbon paste electrode MCPE was build. The electrodes were characterized by scanning electron microscopy (SEM), energy dispersive X-Ray spectroscopy (EDXS), cyclic voltammetry and chronoamperometry. The modifier is elctroactive, a well defined redox couple of NiIII/NiII in alkaline medium was made in evidence. It presents a quasi-reversible system with electron transfer coefficient (0.38) and electron transfer rate of 4.5 s−1. The electrogenerated NiIII species on the surface of the electrode act as an excellent catalyst toward thiosulfate oxidation reaction with a chemical rate constant Kh equal to 23,6 M−1s−1. The different techniques involved in this study qualify our modified electrode as sensitive, reliable and very stable for thiosulfate analysis. |
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| Keywords: | Carbon paste electrode Modified carbon paste electrode Cyclic voltammetry Thiosulfate oxidation |
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