Elaboration of carbon paste electrode containing pentadentate Nickel-(II) Schiff base complex: Application to electrochemical oxidation of thiosulfate in alkaline medium

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 ch...

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Bibliographic Details
Published in:Arabian journal of chemistry 2020-07, Vol.13 (7), p.6072-6083
Main Authors: Belbacha, Walid, Naamoune, Farid, Bezzi, Hamza, Hellal, Nora, Zerroual, Larbi, Abdelkarim, Kahoul, brahim, Bouzarafa, Fernandez Garcia, Marta, López, Daniel
Format: Article
Language:English
Subjects:
Carbon paste electrode
Cyclic voltammetry
Modified carbon paste electrode
NiII-Schiff base complex
Thiosulfate oxidation
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Summary: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.
ISSN:1878-5352
1878-5379
DOI:10.1016/j.arabjc.2020.05.007