Electrochemical behavior of steel-FeNbC composites used in the production of oxygen

Silva, Ariadne de Souza; Martinelli, Antonio Eduardo; Scatena júnior, Hélio; Silva, Jorge Herbert Echude; Alves Júnior, Clodomiro; Távora, Michele Portela

Electrochemical behavior of steel-FeNbC composites used in the production of oxygen

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dc.contributor.author	Silva, Ariadne de Souza
dc.contributor.author	Martinelli, Antonio Eduardo
dc.contributor.author	Scatena júnior, Hélio
dc.contributor.author	Silva, Jorge Herbert Echude
dc.contributor.author	Alves Júnior, Clodomiro
dc.contributor.author	Távora, Michele Portela
dc.date.accessioned	2021-01-19T18:10:37Z
dc.date.available	2021-01-19T18:10:37Z
dc.date.issued	2005-04
dc.description.resumo	The electrocatalytic properties of steel-FeNbC composites were evaluated after potentiostatic ageing with the purpose of establishing the potential use of such materials as electrodes for the industrial production of oxygen. The effect of processing parameters, involved in the production of the composites by powder metallurgy, such as milling conditions and compaction pressure, on the performance of the electrodes was also studied. The electrodes were characterized according to their electrical resistance in NaOH 1M solution, considering that the purpose of the application requires this value to be ~ 0.5 W.cm2. This parameter was evaluated from repetitive electrochemical measurements carried out from 0.7 V to 1.5 V (vs. Ag/AgCl) by electrode anodization. Changes in the electrochemical behavior of the electrodes, especially concerning the O2 evolution in alkaline medium, were studied as a function of the applied potential. The results revealed that the electrocatalytic activity of the electrodes increased upon ageing, probably as a consequence of the growth of oxide layers and/or increase in the conductivity of the material, resulting in current gain and corresponding decrease in the polarization resistance to 0.75 W cm2	pt_BR
dc.identifier.citation	SILVA, Ariadne de Souza; MARTINELLI, Antonio Eduardo; SCATENA JÚNIOR, Hélio; SILVA, Jorge Herbert Echude; ALVES JÚNIOR, Clodomiro; TÁVORA, Michele Portela. Electrochemical behavior of steel-FeNbC composites used in the production of oxygen. Materials Research, [S.L.], v. 8, n. 2, p. 151-153, jun. 2005. Disponível em: https://www.researchgate.net/publication/250029338_Electrochemical_behavior_of_steel-FeNbC_composites_used_in_the_production_of_oxygen. Acesso em: 24 nov. 2020. http://dx.doi.org/10.1590/s1516-14392005000200010.	pt_BR
dc.identifier.doi	10.1590/S1516-14392005000200010
dc.identifier.issn	1980-5373
dc.identifier.issn	1516-1439
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/31281
dc.language	en	pt_BR
dc.publisher	ABM, ABC, ABPol	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Oxygen evolution	pt_BR
dc.subject	Electrochemistry	pt_BR
dc.subject	Metal-ceramic composites	pt_BR
dc.subject	Nobium carbide	pt_BR
dc.title	Electrochemical behavior of steel-FeNbC composites used in the production of oxygen	pt_BR
dc.type	article	pt_BR