Electropolishing in Cyanide Electrolytes

Sullivan, F.; Newton, E. H.

doi:10.1149/1.2427536

Cited by 4 publications

(5 citation statements)

References 4 publications

(4 reference statements)

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“…Following a preliminary annealing in flowing hydrogen at 500~ for 1 hr, the electrodes were electropolished in a cyanide bath (10). The electrolyte was saturated with Ag20 either by adding the powdered oxide into the electrolyte solution or by the anodic oxidation of the silver auxiliary electrode and subsequent agitation of the solution with the use of a mechanical shaker.…”

Section: Methodsmentioning

confidence: 99%

“…The test electrode was punched from 0.13 cm bright rolled silver sheet (99.95% pure) in the form of paddles with a blade approximately 2.54 X 0.63 cm and with a handle of 0.18 cm. Following a preliminary annealing in flowing hydrogen at 500~ for 1 hr, the electrodes were electropolished in a cyanide bath (10). They were rinsed in running distilled water and subjected to a further annealing in hydrogen at 500 ~ C for 1 hr.…”

Section: Methodsmentioning

confidence: 99%

“…Silver electrodes (99.95% pure) 1 cm in diameter and 0.6 cm thick were imbedded in a thermoplastic. These were metallographically polished to 0.25~ and then subsequently electropolished (10) to remove the worked layer. The rotational speed was varied from 0-10,000 rpm.…”

Section: Methodsmentioning

confidence: 99%

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Anodic Behavior of Silver in Alkaline Solutions

Gibbs

Rao

Griffin

et al. 1975

J. Electrochem. Soc.

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The anodic behavior of silver was investigated under controlled diffusion conditions in alkaline solutions. Experiments were carried out under linear flow control and also using a rotating disk electrode. The electrical and optical properties of the silver oxide films were measured. On the basis of these results, we point out the difficulties involved with surface roughness in interpreting diffusion layer kinetics. Finally, we suggest a mechanism for Ag2O film formation under stirred conditions, involving dissolution of silver followed by precipitation, the rate‐controlling step for which is nucleation of steps on the oxide surface.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Anodic Behavior of Silver in Alkaline Solutions

Gibbs

Rao

Griffin

et al. 1975

J. Electrochem. Soc.

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“…Under low temperatures (<50 °C), the breakdown of the native Al 2 O 3 thin layer via the entire hydrolysis reaction is time consuming due to the unique chemistry involved. [ 13–17 ] Bunker and co‐workers quantitatively investigated the chemistry of hydration of the native Al 2 O 3 thin layer on aluminum using secondary ion mass spectrometry in conjunction with isotopic labeling. [ 18 ] Their experimental data indicated that hydroxide ions (OH − ) were the most prevalent product of the hydrolysis reaction of the native Al 2 O 3 thin layer.…”

Section: Introductionmentioning

confidence: 99%

TEMPO‐Oxidized Cellulose Nanofibers as Pseudocatalysts for in Situ and on‐Demand Hydrogen Generation via Aluminum Powder/Pure Water Reactions at a Temperature below 50 °C

Fugetsu

Yoshinaga

Kimura

et al. 2023

Adv Energy and Sustain Res

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Cellulose nanofibers (CNFs) prepared via 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO)‐mediated oxidation of the C6 primary hydroxyls of native cellulose to carboxylates are used as pseudocatalysts for enhancing the aluminum powder/pure water reactions. The Al powder/pure water reaction is a stepwise reaction. It starts from hydration of the outmost native Al2O3 thin layer and then the reaction of the inner metallic Al with water. At lower temperatures (<50 °C), OH− and Al3+ ions are the preliminary products of the native Al2O3 thin layer hydration. Once Al powders are mixed with pure water containing 0.1–0.5 wt% TEMPO‐CNFs, condensed networks consisting of TEMPO‐CNFs self‐establish over the native Al2O3 thin layer. Al3+ ions are captured by TEMPO‐CNFs via the formation of insoluble Al3+/TEMPO‐CNFs complexing nanostructures and the conjugated OH− ions are being restricted nearby the native Al2O3‐based thin layer via electrostatic repulsion. A highly alkaline condition (pH > 11) is dynamically generated, and as a result, the native Al2O3 thin layer dissolves rapidly via the reaction with OH− ions. The OH− ions function also as catalysts, accelerating the reaction of metallic Al with water. Al powders (2–200 μm) react promptly and a nearly 100% Al/H2 conversion is obtained at the reaction temperature below 50 °C.

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“…USP elétrica) e superfície estável, que após pré-tratamento adequado pode ser empregado em sistemas de espectroscopia como FTIR in situ.Diferentes metodologias de preparo da superfície do Au são relatadas na literatura. Neste sentido, têm-se os pré-tratamentos mecânicos, químicos, eletroquímicos e a combinação destes[46][47][48] . A variação destas metodologias pode promover superfícies com variação de rugosidade e atividade catalítica diferente.…”

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Aspectos sobre a eletro-oxidação de etanol catalisadas por nanopartículas de platina e platina-ródio não suportadas

Cantane¹

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A vida rodeia-se de escolhas e oportunidades. Idéias, comportamentos e pensamentos que a compõe, São formas de expressões. A expressão é o reflexo do complexo do contexto, Da harmonia dos figurantes e do personagem principal. Ser o personagem é acordar cada dia e ter o prazer de montar e fazer parte de um palco, Olhar para o roteiro imaginário da vida e vive-lo sem se preocupar com o ponto final. O ponto final é quando para de exprimir um sonho, De buscar e acreditar nas convicções que movem a vida. Acorde todos os dias, monte seu palco e faça parte dele. Para que o seu palco seja o reflexo de suas idéias, do seu comportamento e de seus pensamentos. AbstractParallel reaction pathways are possible during ethanol electro-oxidation on unsupported metal nanoparticles (Pt and PtRh). In the present work, the effect of the base electrolyte, namely HClO 4 (0.1 mol L -1 ) and H 2 SO 4 (0.5 mol L -1 ), on the 0.01 mol L -1 ethanol oxidation is reported. We had also investigated the effects of the ethanol concentration on the reaction pathways between 0.01 and 1.0 mol L -1 .Electrochemical studies and in situ FTIR revealed that Pt presented lower catalytic activity for the ethanol oxidation in H 2 SO 4 than in HClO 4 , for 0.01 mol L -1 ethanol.This observation indicates that strong adsorption of sulfate on (111) domains inhibits the dissociative adsorption of ethanol. In situ FTIR measurements showed the onset of a CO ads (CO L 2040 cm -1 ) band at 0.05 V in perchloric acid, while this band appears only at 0.4 V in sulfuric media. The products formation showed a strong dependence on the ethanol concentration. FTIR spectra revealed the major product of the oxidation in low ethanol concentrations (0.01 to 0.05 mol L -1 ) was CO 2 . However, in high ethanol concentration (0.1 to 1.0 mol L -1 ) the products were CO 2 , acetic acid and acetaldehyde. Chronoamperometric curves at 0.48 V revealed maximum activity in ethanol concentration of 0.5 mol L -1 , where acetic acid and acetaldehyde were the major products. The presence of rhodium in platinum based materials favors the dissociation of the C-C bond. However, in this case, it was observed by FTIR spectra the formation of acetic acid and acetaldehyde, as long as CO 2 , in lower ethanol concentration (0.05 mol L -1 ).

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Electropolishing in Cyanide Electrolytes

Cited by 4 publications

References 4 publications

Anodic Behavior of Silver in Alkaline Solutions

Anodic Behavior of Silver in Alkaline Solutions

TEMPO‐Oxidized Cellulose Nanofibers as Pseudocatalysts for in Situ and on‐Demand Hydrogen Generation via Aluminum Powder/Pure Water Reactions at a Temperature below 50 °C

Aspectos sobre a eletro-oxidação de etanol catalisadas por nanopartículas de platina e platina-ródio não suportadas

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