Microstructural characteristics and electrochemical behavior of Co3O4 sintered electrodes
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Data
2001-01-01
Autores
Silva, G. C. [UNESP]
Codaro, E.
Paiva Santos, C. O. [UNESP]
Fugivara, Cecilio Sadao [UNESP]
Sumodjo, P. T A
Benedetti, Assis Vicente [UNESP]
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Resumo
Co3O4 can be used as electrocatalyst for oxygen evolution reaction. The macro and microstructure of the oxide, obtained by compacting and sintering lithium-doped Co3O4 powder in atmosphere of dry air and in conditions of controlled temperature and time was analyzed by metallographic techniques. The porous material was characterized by XRD, SEM and EDS combined techniques. For working temperatures up to 1200°C, the pellet was consituted of particles with varying sizes over a wide range of particle size and, at higher temperatures CoO is formed and polymorphic transformation was observed. The materials were also characterized electrochemically in alkaline media by open circuit potential and potentiodynamic I/E measurements. The results were compared to those previously prepared by others by thermal deposition.
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Compaction, Electrochemistry, Energy dispersive spectroscopy, Metallographic microstructure, Particle size analysis, Phase transitions, Porous materials, Powder metals, Scanning electron microscopy, Sintering, Thermal effects, X ray powder diffraction, Cobalt oxide electrodes, Electrocatalyst, Polymorphic transformation, Thermal deposition, Cobalt alloys
Como citar
Key Engineering Materials, v. 189-191, p. 388-393.