| Journal: | Materials research |
| Database: | PERIÓDICA |
| System number: | 000312819 |
| ISSN: | 1516-1439 |
| Authors: | Silva, Ariadne de Souza1 Martinelli, Antonio Eduardo Scatena-Junior, Helio Silva, Jorge Herbert Echude Alves-Junior, Clodomiro Távora, Michele Portela |
| Institutions: | 1Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte. Brasil |
| Year: | 2005 |
| Season: | Abr-Jun |
| Volumen: | 8 |
| Number: | 2 |
| Pages: | 151-153 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Nota breve o noticia |
| Approach: | Experimental |
| English abstract | 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 omega.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 omega cm² |
| Disciplines: | Ingeniería, Química |
| Keyword: | Ingeniería de materiales, Ingeniería industrial, Química industrial, Acero, Carburo de niobio, Propiedades electroquímicas, Resistividad eléctrica |
| Keyword: | Engineering, Chemistry, Industrial engineering, Materials engineering, Industrial chemistry, Steel, Niobium carbide, Electrochemical properties, Electrical resistivity |
| Full text: | Texto completo (Ver HTML) |
