Electrodeposition study on ultramicroelectrodes

Peña, María J.; Celdrán, R.; Duo, R.

doi:10.1016/0022-0728(93)03028-n

Cited by 10 publications

(8 citation statements)

References 19 publications

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“…Além disto, vários processos eletródicos têm sido estudados sob uma nova ótica, originada da utilização dos UME. Neste caso, podese citar: (a) reações de desprendimento de gases 10,11 , (b) estudo de reações orgânicas [12][13][14][15] , (c) eletrocristalização 16,17 e (d) estudos voltamétricos na ausência de eletrólito de suporte 18,19 . Devido à freqüente utilização de UME nas diversas áreas como as descritas, vários artigos e revisões tratam de suas propriedades, vantagens e limitações [20][21][22][23][24] .…”

Section: Introductionunclassified

Ultramicroeletrodos. Parte II: construção e aplicações

et al. 1998

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Recebido em 16/10/96; aceito em 14/1/97 ULTRAMICROELECTRODES. PART II: CONSTRUCTION AND APPLICATIONS. This work describes the techniques of construction and several applications of ultramicroelectrodes in electrochemistry and electroanalytical chemistry. Disc shaped UME are produced by embedding metal wires on insulating materials such as glass or epoxy resin. In the field of electrochemistry, UME have been applied in studies of the hydrogen evolution reaction and the electrocrystallization of metals. The negligible values of sensibility for ohmic drop and the enhanced mass transport rate by spherical diffusion are the main advantages of UME in these applications. New important conclusions regarding the phenomena under study were drawn from the experimental results. The applications in electroanalytical chemistry involved the determination of contaminants such as heavy metals and nitrites in natural waters and food products. The use of UME requires little sample manipulation and, in general, no need for oxygen removal or the addition of supporting electrolytes.

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Section: Introductionunclassified

Ultramicroeletrodos. Parte II: construção e aplicações

et al. 1998

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“…Such discrete current spikes have been associated with individual dissolution events, which can be resolved when monitored at the microscopic scale. Current spikes can also be observed during the evaluation of the electrochemical response on nanoelectrodes [35][36][37] .…”

Section: A New Microscopic Perspective Of Electrodepositionmentioning

confidence: 99%

“…This put in perspective the need for spatially resolved techniques to probe the diversity of active regions and provide information about the local distribution of activities on a given surface. Similarly, experiments using micro and nano-electrodes where single isolated sites are expected 35 , have provided accurate information about critical nuclei formation and individual nucleation rates; it also becomes possible to resolve individual events during the electrochemical response, observed as discrete current spikes, which may have been caused by the formation of one nucleus [35][36][37] . Although this approach was able to provide very important aspects about EN&G, micro and nano-electrodes cannot easily address the distribution of active sites.…”

Section: Introductionmentioning

confidence: 99%

Distribution of Copper Electrochemical Nucleation Activities on Glassy Carbon: A New Perspective Based on Local Electrochemistry

Torres

López²,

Demaude³

et al. 2022

J. Electrochem. Soc.

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The electrochemical nucleation and growth (EN&G) on active surface sites has been a concept of fundamental and technological interest for several decades. Here, we have studied the EN&G of Cu on glassy carbon with a new perspective using scanning electrochemical cell microscopy (SECCM), in combination with scanning electron microscopy, atomic force microscopy, and X‐ray photo-electron spectroscopy. Unlike the conventional macroscopic approach, we leveraged the spatial resolution of the SECCM to probe individual sites on the same surface, independently from each other, revealing regions with different energy barriers for nucleation and a distribution of activities for EN&G at the microscopic scale. This site-dependent activity can be modified with common surface pretreatments (i. e., polishing and preanodization). We addressed the electrochemical diversity through multiple descriptors and used them to conduct statistical analysis, supported by surface characterization techniques, bringing forward information that is simply unavailable with the conventional macroscopic approach. This work serves as a departure point to conceive new analysis strategies and address the real nature of active sites for nucleation.

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“…Also, the effects of small variations in the surface area of the substrate can be detected in electrochemical measurements. 35 Moreover, UMEs allow a faster double-layer charging, reduced ohmic loss, and high mass-transport rates 36 . Moreover, the use of UME's offers advantages such as the formation of a single core with controlled morphology and size, which leads to precise control of the electronic, chemical, and optical properties of the synthesized material.…”

Section: Introductionmentioning

confidence: 99%

An Electrochemical Study of the Cobalt Electrodeposition Onto a Carbon Fiber Ultramicroelectrode

Corona-Castro¹,

Álvarez-Romero²,

Rivera³

et al. 2022

J. Chil. Chem. Soc.

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A kinetic study of the cobalt electrodeposition onto a carbon fiber ultramicroelectrode of 11 µm of diameter was conducted in overpotential conditions from an aqueous solution containing 0.01 M CoCl2 + 0.1 M NH4Cl. From the voltamperometric and chronoamperometric studies, it was found that the value of the diffusion coefficient is 1.2x10 -5 cm 2 s -1 . The analysis of the current density transients suggests that cobalt electrodeposition onto a carbon fiber electrode follows an instantaneous nucleation process controlled by spherical diffusion mass transport. Also, the number of active nucleation sites increases as the applied potential decreases.

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Electrodeposition study on ultramicroelectrodes

Cited by 10 publications

References 19 publications

Ultramicroeletrodos. Parte II: construção e aplicações

Ultramicroeletrodos. Parte II: construção e aplicações

Distribution of Copper Electrochemical Nucleation Activities on Glassy Carbon: A New Perspective Based on Local Electrochemistry

An Electrochemical Study of the Cobalt Electrodeposition Onto a Carbon Fiber Ultramicroelectrode

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