Pt-Ru electrodeposited on gold from chloride electrolytes

Гаврилов, А. Н.; Петрий, О. А.; Mukovnin, A. A.; Smirnova, N. V.; Levchenko, T.V.; Tsirlina, Galina A.

doi:10.1016/j.electacta.2006.08.025

Cited by 33 publications

(35 citation statements)

References 42 publications

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“…For Pt-based electrocatalysts, the measurement of H UPD charge includes contributions from bisulfate adsorption, vary for different crystallographic planes [8] and the total charge is sensitive to sur-UPD is an alternative method to evaluate PtRu surface area [2,16,17] although several problems were also raised [2].…”

Section: Introductionmentioning

confidence: 99%

“…It is often used as a reference catalyst, and its surface is measurable using different electrochemical methods [3] including the charge of the hydrogen underpotential deposition peaks (H UPD) in cyclic voltammetry [2], and stripping charges of adsorbed CO [4][5][6], or Cu UPD [7]. However, these are not absolute methods, all of them have their advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

“…Electrocatalysts are generally characterized by high electrocatalytic activity that may arise as a result of high real surface area and/or high intrinsic activity [1,2]. From a fundamental viewpoint, it is imperative to differentiate between both contributions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of the real surface area of powdered materials in cavity microelectrodes by electrochemical impedance spectroscopy

Tremblay

Martin

Lebouin

et al. 2010

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of the real surface area of powdered materials in cavity microelectrodes by electrochemical impedance spectroscopy

Tremblay

Martin

Lebouin

et al. 2010

Electrochimica Acta

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“…%) determined by the two methods is almost identical in the three first samples (BP1-PR, BP2-PR and BP3-PR) in agreement with the ratio of the metal concentrations in the electrodeposition solutions. This result can be rationalized considering that Ru is codeposited with Pt on the BP at a lower overpotential than when it is deposited as a single metal, favored kinetically by the platinum nuclei formed over the carbon support [21]. However, the ruthenium content in the three last samples (BP4-PR, BP5-PR and BP6-PR) is lower than that measured in the other ones.…”

Section: Physicochemical Characterization Of the Catalystsmentioning

confidence: 50%

Single-walled carbon nanotube buckypapers as electrocatalyst supports for methanol oxidation

Sieben

Ansón‐Casaos

Martı́nez

et al. 2013

Journal of Power Sources

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This work studies the use of various single-walled carbon nanotube (SWCNT) buckypapers as catalyst supports for methanol electro-oxidation in acid media. Buckypapers were obtained by vacuum filtration from pristine and oxidized SWCNT suspensions in different liquid media. Pt-Ru catalysts supported on the buckypapers were prepared by multiple potentiostatic pulses using a diluted solution of Pt and Ru salts (2 mM H 2 PtCl 6 + 2 mM RuCl 3 ) in acid media. The resulting materials were characterized via SEM, TEM, EDX and ICP-OES analysis. Well dispersed rounded nanoparticles between 2 and 15 nm were successfully electrodeposited on the SWCNT buckypapers. The ruthenium content in the bimetallic deposits was between 32 and 48 at. %, while the specific surface areas of the catalysts were in the range of 72 to 113 m 2 g -1 . It was found that the solvent used to prepare the SWCNT buckypaper films has a strong influence on the catalyst dispersion, particle size and metal loading. Cyclic voltammetry and chronoamperometry experiments point out that the most active electrodes for methanol electro-oxidation were prepared with the buckypaper supports that were obtained from SWCNT dispersions in N-methylpyrrolidone.

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“…La formación de dendritas usualmente resulta de un proceso de deposición en las regiones donde la electrodeposición tiene lugar bajo control por transferencia de masa o control mixto. Este efecto acelera el crecimiento de las dendritas debido a la elevada velocidad de difusión de los iones metálicos en las puntas de las dendritas (similar al mecanismo de difusión en un microelectrodo [22,23], lo que da lugar a un proceso de nucleación secundaria [24]. La adición de agentes acomplejantes, agentes humectantes u otros aditivos dentro del baño de electrodeposición reduce la densidad de corriente en la punta de las dendritas [25] inhibiendo el proceso de formación/crecimiento de las mismas como es observado en las Figuras 3(e), (f) y (g).…”

Section: Resultados Y Discusiónunclassified

Efecto de aditivos orgánicos en la deposición de catalizadores Pt-Ru

2010

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RESUMENLa codeposición simultánea de Pt y Ru sobre materiales de carbono se llevó a cabo potenciostáticamente a -0,5 V a partir de soluciones acuosas de H 2 PtCl 6 y RuCl 3 en presencia de diferentes aditivos orgánicos: 1) etilenglicol, 2) etanol, 3) ácido fórmico, 4) citrato de sodio, 5) tartrato de sodio y 6) Na 2 H 2 EDTA. El proceso de electrodeposición fue influenciado termodinámica y cinéticamente por la presencia de los diferentes agentes estabilizantes. Los análisis SEM y AFM de los electrodos revelaron que el tamaño de las partículas y el área superficial activa de los catalizadores fueron notablemente afectados por la presencia de los agentes estabilizantes.Las diferencias en el comportamiento de los diferentes aditivos orgánicos en las soluciones de electrodeposición pueden ser asociadas con los siguientes efectos: 1) capacidad del estabilizante para acomplejar al ión metálico, 2) la adsorción específica de las moléculas orgánicas que inhiben el crecimiento de las partículas, y 3) la capacidad reductora de los compuestos orgánicos (sólo para los tres primeros aditivos).Los electrodos preparados con diferentes aditivos orgánicos presentan el siguiente orden decreciente de actividades catalíticas para la oxidación de metanol: citrato > tartrato > etanol > Na 2 H 2 EDTA > etilenglicol > ácido fórmico > sin estabilizante. Este comportamiento puede relacionarse con diferencias en el área superficial activa, tamaño de partícula y la estructura superficial del depósito metálico.Palabras claves: Electrodeposición, catalizadores bimetálicos soportados Pt-Ru, aditivos orgánicos. Effect of organic additives on the deposition of Pt-Ru catalysts ABSTRACTThe simultaneous codeposition of Pt and Ru on carbon materials was carried out potentiostatically at -0.5 V from H 2 PtCl 6 and RuCl 3 aqueous solutions in the presence of different organic additives: 1) ethylene glycol, 2) ethanol, 3) formic acid, 4) sodium citrate, 5) sodium tartrate and 6) Na 2 H 2 EDTA. The electrodeposition process was influenced thermodynamically and kinetically by the stabilizers. SEM and AFM analysis of the electrodes showed that both the particle size and the active surface area were notably affected by the presence of the stabilizing agents.The different behaviour of the stabilizing agents may be associated with the following effects: (1) the capability of the stabilizing agent to complex the metal ions, (2) the specific adsorption of organic molecules which inhibits particle growth, and (3) the reduction capability of the organic compounds.The electrodes prepared with different organic additives exhibit the following decreasing order of activities for methanol oxidation: citrate > tartrate > ethanol > Na 2 H 2 EDTA > ethylene glycol > formic acid > without stabilizer. This comportment can be related to differences in the active surface area, particle size and superficial structure of the metallic deposit.Keywords: Electrodeposition, bimetallic Pt-Ru supported catalysts, organic additives. INTRODUCCIÓNLa actividad catalítica de un sistema...

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Pt-Ru electrodeposited on gold from chloride electrolytes

Cited by 33 publications

References 42 publications

Determination of the real surface area of powdered materials in cavity microelectrodes by electrochemical impedance spectroscopy

Determination of the real surface area of powdered materials in cavity microelectrodes by electrochemical impedance spectroscopy

Single-walled carbon nanotube buckypapers as electrocatalyst supports for methanol oxidation

Efecto de aditivos orgánicos en la deposición de catalizadores Pt-Ru

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