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Type: Artigo de periódico
Title: Thirty minutes laser calcination method for the preparation of DSA (R) type oxide electrodes
Author: Pelegrino, RRL
Vicentin, LC
De Andrade, AR
Bertazzoli, R
Abstract: In this paper, a new approach for the preparation of dimensionally stable anodes DSA(R) 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 mum 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. (C) 2002 Elsevier Science B.V. All rights reserved.
Subject: oxide electrodes
DSA (R) type electrodes
laser surface treatment
electrodes for oxygen evolution
Country: EUA
Editor: Elsevier Science Inc
Citation: Electrochemistry Communications. Elsevier Science Inc, v. 4, n. 2, n. 139, n. 142, 2002.
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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