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Type: Artigo de periódico
Title: Preparation And Electrochemical Behavior Of The Ca/tio2/sb 2o5 Composite Electrode Modified With P-benzoquinone
Author: Hoffmann Da Rocha A.A.
Pires E.B.
Nectoux A.D.S.
Dias S.L.P.
Lima E.C.
Radtke C.
Kubota L.T.
Abstract: In this present study, a novel material made up of p-benzoquinone (BQ) immobilized on a new composite of cellulose acetate and mixed metal oxides (CA/TiO2/Sb2O5) was applied to the electrocatalytic oxidation of ascorbic acid (H2AA). The material was prepared by a phase inversion process and characterized by several techniques including scanning electronic microscopy coupled with energy dispersive spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), and X-ray fluorescence. Ti and Sb mapping profiles on the surface showed a homogeneous distribution of the matrices. Ti2p and Sb3d doublet indicate that the formation of TiO2 and Sb2O5 is the presumed responsible for the good rigidity of the polymeric matrix. A carbon paste electrode of this material was used to study the electrocatalytic oxidation of ascorbic acid by cyclic voltammetric, chronoamperometric and differential pulse techniques. The electrode had a quick response time, showing great potential to be utilized as an electrochemical sensor for the determination of ascorbic acid in commercial samples. © 2012 Elsevier B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/j.jelechem.2012.11.019
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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