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Type: Artigo de periódico
Title: Electrochemical properties of a porphyrin-cobalt (II) adsorbed on silica-titania-phosphate composite surface prepared by the sol-gel method
Author: Castellani, AM
Gushikem, Y
Abstract: SiO2/TiO2/phosphate was obtained by the sol-gel processing method, having the following characteristics: specific surface area S-BET = 800 m(2) g(-1), Ti = 14.8 wt% and P = 1.5 wt%, and ion exchange capacity of 0.58 mmol g(-1). The tetrakis(1-methyl-4-pyridyl) porphyrin ion, H2TmPyP4+, was immobilized on the matrix surface by an ion exchange reaction and then metallated in situ with Co(II), resulting in SiO2/TiO2/phosphate/CoTmPyP material. The amount of CoTmPyP incorporated to the matrix was 35.0 mu mol g(-1). Cyclic voltammetry studies and rotating disk electrode experiments using a carbon paste electrode made with the material were carried out. The immobilized complex catalyzed O-2 reduction to H2O at -0.22 V in 1 mol L-1 KCI solution at pH 6.8. The cathodic current intensities plotted against O-2 concentrations, between 1 and 11 ppm, showed a linear correlation. (C) 2000 Academic Press.
Subject: oxygen electrocatalytic reduction
chemically modified electrode
silica-titania-phosphate composite
Country: EUA
Editor: Academic Press Inc
Citation: Journal Of Colloid And Interface Science. Academic Press Inc, v. 230, n. 1, n. 195, n. 199, 2000.
Rights: fechado
Identifier DOI: 10.1006/jcis.2000.7091
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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