Nickel hydroxide modified electrodes for urea determination
Nickel hydroxide films were prepared by electrodeposition from a solution Ni(NO3)2 0,05 mol L ?¹ on ITO electrodes (Tin oxide doped with Indium) on PET-like plastic film, applying a current of - 0,1 A cm ?² during different time intervals between 1800 and 7200 s. The electrochemical behavior of th...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2007 |
| País: | Brasil |
| Institución: | Universidade Estadual de Londrina (UEL) |
| Repositorio: | Revista Semina: Ciências Exatas e Tecnológicas (Online) |
| Idioma: | portugués |
| OAI Identifier: | oai:ojs2.ojs.uel.br:article/1887 |
| Acceso en línea: | https://ojs.uel.br/revistas/uel/index.php/semexatas/article/view/1887 |
| Access Level: | acceso abierto |
| Palabra clave: | Urea Sensor Nickel hydroxide. Uréia Hidróxido de níquel. Eletrodos modificados |
| Sumario: | Nickel hydroxide films were prepared by electrodeposition from a solution Ni(NO3)2 0,05 mol L ?¹ on ITO electrodes (Tin oxide doped with Indium) on PET-like plastic film, applying a current of - 0,1 A cm ?² during different time intervals between 1800 and 7200 s. The electrochemical behavior of the nickel hydroxide electrode was investigated through a cyclic voltammogram, in NaOH 1,0 mol L ?¹, where it was observed two peaks in the profile in 0,410 and 0,280 V, corresponding to redox couple Ni(II)/Ni(III). A sensor for urea presenting a satisfactory answer can be obtained when, after the deposit of the film of Ni(OH)2 on the electrode of nickel, it is immersed in a solution of NaOH 1,0 mol L ?¹ and applying a potential of + 0,435 V, where the maximum of the anodic current occurs in the cyclic voltammogram. Analyzing the results it can be observed that, for a range of analite concentration between 5 to 50 m mol L ?¹, the behavior is linear and the sensibility found was of 20,3 mA cm?² (mol L?¹)?¹, presenting reproducibility confirming the nickel hydroxide electrodes utilization for the determination of urea. |
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