Influence of citric acid on the silver electrodeposition from aqueous AgNO3 solutions

Zarkadas, G.M.; Στέργιου, Α.; Παπαναστασίου, Γεώργιος

doi:10.1016/j.electacta.2005.02.081

Cited by 49 publications

(30 citation statements)

References 36 publications

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“…The production of Pt-Ru nanoparticles by electrochemical techniques is advantageous (simple operation, low cost, high purity, and uniform deposition), because the catalyst particle size and Pt-Ru alloy structure can be controlled by the selection of current density or overpotential (physical control) [6,[11][12][13][14] and the use of complexing agents or grain refiners [15][16][17][18][19][20]. The current density or the overpotential is responsible for the number and size of the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Influence of complexing agents on the preparation of bimetallic platinum–ruthenium catalysts supported on O-functionalized graphite cloths

Sieben

Duarte

Mayer

2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Influence of complexing agents on the preparation of bimetallic platinum–ruthenium catalysts supported on O-functionalized graphite cloths

Sieben

Duarte

Mayer

2010

Journal of Alloys and Compounds

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“…polyvinyl pyrolidine interacts with Pt-Ru catalyst surface sites [20], EDTA, tartaric acid and citric acid have been used as growth inhibitors in silver, copper, zinc, nickel and tin electrodeposition [21][22][23][24][25]. Similar effects are observed in the chemical reduction of Pt and Pt-Ru in aqueous solution containing one or more alcoholic components, especially ethylene glycol (EG) as reducing agent [26][27][28].…”

Section: Introductionmentioning

confidence: 63%

Influence of ethylene glycol, ethanol and formic acid on platinum and ruthenium electrodeposition on carbon support material

Sieben¹,

Duarte

Mayer

et al. 2008

J Appl Electrochem

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Carbon supported Pt-Ru catalysts were prepared by potentiostatic deposition at -0.5 V from H 2 PtCl 6 ? RuCl 3 in H 2 SO 4 solution in the presence of ethylene glycol (EG), ethanol (EtOH) and formic acid (HCOOH) as stabilizing agents. The active surface area of the Pt-Ru catalyst was determined by Cu-UPD. The highest value was obtained with HCOOH added, followed by EtOH, and EG. SEM and AFM images showed that the mean particle size of the Pt-Ru nanoparticles was three or four times smaller in the presence of a stabilizer. Electrocatalytic activity measurements indicated that the most active electrode for methanol electrooxidation was obtained with EtOH as additive, followed by EG. The electrode prepared with HCOOH additive gave lower catalytic activity than that without stabilizing agent.

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“…En el espectro de la solución de H 2 PtCl 6 y RuCl 3 sin estabilizador se observan dos picos de absorción en ~200 y ~260 nm, característicos de la absorción de los complejos PtCl 4 -2 y PtCl 6 -2 , respectivamente [8,9]. El pico que aparece a 260 nm es el resultado de la transición de transferencia de carga desde el ligando al metal en los iones PtCl 6 -2 [9].…”

Section: Resultados Y Discusiónunclassified

“…Los agentes estabilizantes y los acomplejantes orgánicos han sido utilizados para prevenir la aglomeración de partículas nanométricas de catalizadores metálicos, por ejemplo el EDTA, el ácido tartárico y el ácido cítrico han sido utilizados como inhibidores de crecimiento en la electrodeposición de plata, zinc, cobre, níquel y estaño [3,4]. Asimismo, la adición de un alcohol, como el etilenglicol, a la solución de electrodeposición puede prevenir y limitar la formación de aglomerados de partículas [5].…”

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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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Influence of citric acid on the silver electrodeposition from aqueous AgNO3 solutions

Cited by 49 publications

References 36 publications

Influence of complexing agents on the preparation of bimetallic platinum–ruthenium catalysts supported on O-functionalized graphite cloths

Influence of complexing agents on the preparation of bimetallic platinum–ruthenium catalysts supported on O-functionalized graphite cloths

Influence of ethylene glycol, ethanol and formic acid on platinum and ruthenium electrodeposition on carbon support material

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

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