Catalityc effects of ruthenium and osmium spontaneous deposition on platinum surfaces toward methanol oxidation

Bonilla, Sílvia H.; Zinola, C.F.; Rodrı́guez, José Luis; Díaz, Verónica; Ohanian, Mauricio; Martínez, S.; Giannetti, Biagio F.

doi:10.1016/j.jcis.2005.03.039

Cited by 19 publications

(15 citation statements)

References 47 publications

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“…También se puede ver que las deposiciones con bajos recubrimientos superficiales (θ), realizados sucesivamente y estabilizados cada vez, mejoran el comportamiento final del depósito de Sn frente a la oxidación. Este hecho está posiblemente asociado a la formación de islas de Sn sobre la superficie de Pt [13,34,35]. El límite obtenido de un 60% de cubrimiento puede ser asociado a los niveles de repulsión encontrados para la adsorción física inicial.…”

Section: Discusión De Resultadosunclassified

“…A fin de evaluar los efectos del Sn en Pt pc, se realizaron las deposiciones del mismo, como se indica en la literatura [10,11,13,40], según la siguiente metodología: Deposición espontánea de estaño por inmersión del platino en una disolución del mismo a circuito abierto o potencial libre de disolución. Todas las deposiciones fueron realizadas desoxigenando las disoluciones con nitrógeno de alta pureza (Air Lyquide 5.0).…”

Section: Métodos De Deposiciónunclassified

“…En este sistema la deposición depende de las condiciones de la superficie, del medio electrolítico y de la naturaleza del metal a depositar [2][3][4][5]. La existencia de diferentes métodos de deposición, hace particularmente atractiva la consideración de la deposición espontánea (esp), en virtud de su facilidad, rapidez y relativa estabilidad [9][10][11][12][13][14]. Dependiendo de la técnica, se logran en general cubrimientos superficiales parciales, con estabilidad y reactividad variable y compleja [15][16][17][18].…”

Section: Introductionunclassified

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Characteristics of the spontaneous deposition of Sn in polycrystalline Pt

Yáñez

2012

Port. Electrochim. Acta

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Spontaneous deposition of tin (Sn) in polycrystalline platinum (Pt pc) from a sulfuric acid solution of tin salts, was evaluated by conventional electrochemical techniques, to determine its characteristics. Tin was deposited from a solution of SnCl 2 or SnSO 4 in sulfuric acid 1 M. The degree of surface coating by Sn was calculated by evaluating the region of hydrogen electrosorption through voltammograms performed using solutions containing only the supporting electrolyte, and the supporting electrolyte containing the Sn salt, respectively. The adsorption behavior of tin and oxidation have been studied by the results obtained with platinum electrodes and electrodes of platinum/tin, considering as comparative parameter the adsorption efficiency with respect to the area free of platinum.Keywords: tin, platinum, spontaneous, electrocatalysis, voltammetry. IntroducciónLa modificación de superficies metálicas por deposición de otros metales es una de las técnicas más usuales para la generación y evaluación de nuevos catalizadores. La química verde plantea actualmente una tendencia a la minimización de las energías necesarias para la generación de un nuevo producto, así como la disminución de la toxicidad en su producción. En este sentido, las técnicas electroquímicas son una de las metodologías empleadas, las cuales permiten optimizar la generación de estas superficies metálicas compuestas [1]. Dentro de las técnicas más usuales de obtención de estas superficies por vía electroquímica se encuentra i) el depósito de metales a potenciales positivos con respecto al potencial de la cupla metálica E 0 Mz+/M , llamado depósito a subpotenciales (under potential deposition o upd); ii) la deposición a potenciales

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Section: Discusión De Resultadosunclassified

Section: Métodos De Deposiciónunclassified

Section: Introductionunclassified

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Characteristics of the spontaneous deposition of Sn in polycrystalline Pt

Yáñez

2012

Port. Electrochim. Acta

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“…Nevertheless, the more emphasis of those works deals with the dependence of the electrocatalytic activity of the surface on the method employed for its preparation and in a minor extent with the composition of the electrolyte solution principally with the nature of the counterion [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…The present work is part of studies [3,[22][23][24] concerning the electrocatalytic effect produced by the addition of a second metal on Pt surface electrodes in the electrooxidation of methanol and carbon monoxide. In this study, Ag-covered pc Pt electrodes are used, emphasizing the influence of the precursor solution composition, i.e., using Ag with different counter ions, namely sulfate, nitrate, and acetate, and using the same method for the preparation of all the catalysts.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Deposition of Ag. Influence of Composition of Ag-Containing Solution on the Electrocatalytic Activity of Pt-Modified Surface

Martínez¹,

Martins

Zinola³

2011

Electrocatal

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Using spontaneous and electrochemical deposition of Ag, Ag-covered Pt polycrystalline electrodes were prepared. The behavior of these Pt-based composite catalysts depends on their morphology, the crystalline and electronic properties, and in a minor extent, the solution composition containing Ag ion. This work deals with the study of methanol and carbon monoxide electrooxidation using Pt surfaces modified by Ag through spontaneous deposition. The main objective is to investigate the influence of the counterion nature of Ag-containing electrolytic solutions. For this purpose, the electrooxidation of methanol adsorbed residues and also of carbon monoxide was studied applying conventional electrochemical methods in aqueous 1 M H 2 SO 4 . Those reactions exhibit different behavior which is highly dependent on the nature of the Ag-containing electrolytic solution used to carry out the deposition process. The results demonstrate that in the adsorption process of both methanol residues and carbon monoxide, the interaction with Pt surface is achieved through electrodeposited Ag, but the counterion plays a significant role. A theoretical model is proposed in which it is considered the coadsorption of the counterion with water molecules preadsorbed on Pt surface and the interaction of the anions with residues adsorbed from carbon monoxide and methanol.

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Metal Carbonyl Cluster Complexes as Electrocatalysts for PEM Fuel Cells

Uribe-Godínez

2018

Nanostructured Materials for Next-Generation Energy Storage and Conversion

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Catalityc effects of ruthenium and osmium spontaneous deposition on platinum surfaces toward methanol oxidation

Cited by 19 publications

References 47 publications

Characteristics of the spontaneous deposition of Sn in polycrystalline Pt

Characteristics of the spontaneous deposition of Sn in polycrystalline Pt

Spontaneous Deposition of Ag. Influence of Composition of Ag-Containing Solution on the Electrocatalytic Activity of Pt-Modified Surface

Metal Carbonyl Cluster Complexes as Electrocatalysts for PEM Fuel Cells

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