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|Type:||Artigo de periódico|
|Title:||Thirty Minutes Laser Calcination Method For The Preparation Of Dsa® Type Oxide Electrodes|
De Andrade A.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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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