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Type: Artigo de periódico
Title: Thirty Minutes Laser Calcination Method For The Preparation Of Dsa® Type Oxide Electrodes
Author: Pelegrino R.R.L.
Vicentin L.C.
De Andrade A.R.
Bertazzoli R.
Abstract: In this paper, a new approach for the preparation of dimensionally stable anodes DSA® type oxide electrodes, using a CO2 laser as a heat source, is proposed. Commercial composition of (TiO2)0.7(RuO2)0.3 was used for this feasibility study in which thermal decomposition of precursor chlorides, for the growth of a coating 2-3 μm thick, is carried out in 30 min. The resulting oxide layer presented the usual cracked-mud morphology that lasted 8 h in an accelerated service life test at 400 mA cm-2, in a H2SO4 1 M solution. The results involving the effects of laser beam power and scan rate are examined. Voltammetric anodic charge was maximized by the combination of 15 W beampower, focal distance of 210 mm and beam scan rate of 35 mm s-1. By cycling potential between 0.2 and 1.1 V vs SCE the oxide coating behaved as a capacitor capable of being charged and discharged reversibly and the cathodic/anodic charge ratio remained close to one. Currents related to oxygen evolution reaction were observed after 1.37 V vs SCE. © 2002 Elsevier Science B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S1388-2481(01)00295-8
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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