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https://repositorio.ufba.br/handle/ri/5894
metadata.dc.type: | Artigo de Periódico |
Título : | Nickel-dimethylglyoxime complex modified graphite and carbon paste electrodes: preparation and catalytic activity towards methanol/ethanol oxidation |
Otros títulos : | Journal of Applied Electrochemistry |
Autor : | Cardoso, William S. Dias, Vera L. N. Costa, Wendell M. Rodrigues, Isaide de Araujo Marques, Edmar P. Sousa, Antonio G. Boaventura Filho, Jaime Soares Bezerra, Cicero W. B. Song, Chaojie Liu, Hansan Zhang, Jiujun Marques, Aldaléa L. B. |
metadata.dc.creator: | Cardoso, William S. Dias, Vera L. N. Costa, Wendell M. Rodrigues, Isaide de Araujo Marques, Edmar P. Sousa, Antonio G. Boaventura Filho, Jaime Soares Bezerra, Cicero W. B. Song, Chaojie Liu, Hansan Zhang, Jiujun Marques, Aldaléa L. B. |
Resumen : | Nickel-dimethylglyoxime complex (abbreviated as Ni(II)(DMG)2) modified carbon paste and graphite electrodes were prepared by mixing Ni(II)(DMG)2 with graphite paste, and coating Ni(II)(DMG)2 to the graphite surface. It is necessary to cycle the electrode potential to a high value (e.g. 0.8 V versus SCE) for the preparation of the modified electrodes.The electrochemical reaction was originally assumed to be a one-electron process converting Ni(II)(DMG)2 to[(DMG)2(H2O)Ni(III)ONi(III)(OH)(DMG)2]-. [(DMG)2(H2O) Ni(III)ONi(III)(OH)(DMG)2]- showed a strong catalytic activity toward electro-oxidation of methanol and ethanol. The electrocatalytic oxidation currents consistently increase with the increase in Ni(II)(DMG)2 loading, OH-, and alcohol concentrations. Rotating disk electrode results obtained with a Ni(II)(DMG)2 coated graphite disk electrode showed that the electrocatalytic oxidation of alcohol is a 4-electron process producing formate anion (methanol oxidation) or acetate anion (ethanol oxidation). A mechanism for the electrocatalytic oxidation of methanol/ethanol was proposed, and a rate-determining step was also discussed. |
Palabras clave : | Ethanol Methanol Electro-oxidation Electrocatalysts Nickel-dimethylglyoxime Carbon paste Graphite electrodes |
URI : | http://www.repositorio.ufba.br/ri/handle/ri/5894 |
Fecha de publicación : | 2009 |
Aparece en las colecciones: | Artigo Publicado em Periódico (Química) |
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Fichero | Descripción | Tamaño | Formato | |
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__www.springerlink.com_c...22542164451t5555_fulltext.pdf Restricted Access | 264,46 kB | Adobe PDF | Visualizar/Abrir Request a copy |
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