Synthèse d’un nouveau matériau polymérique à base de poly (4-vinylpyridine-co-divinylbenzène) modifié par un complexe base de Schiff de nickel : étude thermique et électrochimique et application à l’électro-oxydation de l’éthanol

Abstract

Poly(4-vinylpyridine) crosslinked by 2% divinylbenzene was partially quaternized by a bidentate Schiff base nickel complex containing C–Br function in its molecular structure. The resulting poly(4-vinylpyridine-co-divinylbenzene)-Ni(II) Schiff base complex was characterized using various techniques such as elemental analysis and Fourier-transform infrared (FT-IR) spectroscopy and thermogravimetric (TG)/(DTG) analysis. The synthesized copolymer covalently grafted with the nickel(II) complex was mixed with carbon black paste to prepare a new modified electrode material. The electrochemical properties of the resulting modified electrode, recorded in alkaline solution, were investigated by cyclic voltammetry, revealing a well-defined redox process corresponding to the Ni(III)/Ni(II) redox couple. The effects of parameters such as the scan rate and ethanol concentration were explored for electrooxidation of ethanol using this modified electrode