The response of some nucleation/growth processes to triangular scans of potential

Fletcher, Stephen; Halliday, Cameron; Gates, D. J.; Westcott, Mark; Lwin, T.; Nelson, Gareth

doi:10.1016/s0022-0728(83)80627-5

Cited by 365 publications

(189 citation statements)

References 8 publications

Supporting

Mentioning

168

Contrasting

Unclassified

Order By: Relevance

“…2a), caused by the phase nucleation in the forward scan. The theory and observable characteristic features in a CV scan were formulated for both interfacial and diffusion control of the crystal growth kinetics [39]. In other words, as seen in Fig.…”

Section: Testsmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure, surface chemistry and electrochemical response of Ag|AgCl sensors in alkaline media

et al. 2018

View full text Add to dashboard Cite

Characterization of the Ag/AgCl electrode is a necessary step toward its application as a chloride sensor in a highly alkaline medium, such as concrete. The nucleation and growth of AgCl on Ag in 0.1 M HCl was verified through cyclic voltammetry. Ag anodization was performed at current densities, determined by potentiodynamic polarization in the same (0.1 M HCl) medium. The morphology and microstructure of the AgCl layers were evaluated via electron microscopy, while surface chemistry was studied through energy-dispersive spectroscopy and X-ray photoelectron spectroscopy. At current density above 2 mA/cm 2 , the thickness and heterogeneity of the AgCl layer increased. In this condition, small AgCl particles formed in the immediate vicinity of the Ag substrate, subsequently weakening the bond strength of the Ag/AgCl interface. Silver oxide-based or carbon-based impurities were present on the surface of the sensor in amounts proportional to the thickness and heterogeneity of the AgCl layer. It is concluded that a well-defined link exists between the properties of the AgCl layer, the applied current density and the recorded overpotential during Ag anodization. The results can be used as a recommendation for preparation of chloride sensors with stable performance in cementitious materials.

show abstract

Section: Testsmentioning

confidence: 99%

“…2a and inlet). A constancy of the cross-over point would mean the formation of crystals of a large size, while in contrast, a cathodic shift of this point would be denoted to diffusion-controlled crystal growth and will also imply a decreasing crystal size [39]. A cathodic shift of the cross-over point ( Fig.…”

Section: Testsmentioning

confidence: 99%

Microstructure, surface chemistry and electrochemical response of Ag|AgCl sensors in alkaline media

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In the reverse potential scan, two crosses were observed. According to the theory developed by Fletcher et al [25], the more cathodic crossing at -0.38 V x Ag/AgCl/KCl (sat.) is characterized as the nucleation potential (E n ), whereas the second crossing, at 0.04 V x Ag/AgCl/KCl (sat.)…”

Section: Electrochemical Responses Of Diamond Films In the Copper Elementioning

confidence: 99%

A comparative study of copper electrodeposition and photoelectrodeposition on boron doped diamond

Couto

Ribeiro

Migliorini

et al. 2013

Diamond and Related Materials

View full text Add to dashboard Cite

Copper (Cu) electrodeposition and photoelectrodeposition on highly boron-doped diamond films (BDD) were investigated, at two different pH solutions. Cu particles were deposited in the potentiostat mode and under UV irradiation. The as-grown as well as the Cu modified BDD films were characterized by Raman Spectroscopy and Scanning Electron Microscopy. The copper photocatalytic deposition on BDD was discussed taking into account the influence of the photogenerated electrons for photoelectrodeposition process at both acid and neutral pH solutions. Under UV irradiation, the copper deposits presented higher density and uniformity all over the crystal faces when compared with those without UV irradiation.This behavior may be attributed to BDD semiconductor character due to its photogenerated electrons which enhanced the copper reduction reaction.

show abstract

“…Na varredura positiva de potenciais, os dois cruzamentos entre os ramos de corrente catódica, observados nas três soluções estudadas, definem o sobrepotencial de nucleação (E n ) e o potencial reversível do sistema Cu +2 /Cu (E rev ). 43,44 Ambos os potenciais foram definidos na Figura 4. Nas três soluções eletrolíticas, E rev apresentou o mesmo valor de -0,06 V. Entretanto, o valor do E n mais positivo verificado para a solução de pH~5 indica que a energia necessária para a formação de núcleos de Cu foi menor quando comparada às soluções de pH~2, devido ao favorecimento da descarga dos íons Cu +2 na interface do DDB/eletrólito, associada à condutividade iônica da solução de pH~5.…”

Section: Eletrodeposição De Nps-cu Sobre Eletrodos De Ddbunclassified

Influência do eletrólito na eletrodeposição de nanopartículas de Cu sobre eletrodo de diamante dopado com boro

Matsushima¹,

Santos²,

Couto³

et al. 2012

Quím. Nova

View full text Add to dashboard Cite

Recebido em 21/9/10; aceito em 12/5/11; publicado na web em 4/7/11 ELECTROLYTE INFLUENCE ON THE Cu NANOPARTICLES ELECTRODEPOSITION ONTO BORON DOPED DIAMOND ELECTRODE. This paper presents the electrolyte influence on deposition and dissolution processes of Cu nanoparticles on boron doped diamond electrodes (BDD). Morphological, structural and electrochemical analysis showed BDD films with good reproducibility, quality and reversible in a specific redox system. Electrodeposition of Cu nanoparticles on DDB electrodes in three different solutions was influenced by pH and ionic strength of the electrolytic medium. Analyzing the process as function of the scan rate, it was verified a better efficiency in 0,5 mol L -1 Na 2 SO 4 solution. Under the influence of the pH and ionic strength, Cu nanoparticles on DDB may be obtained with different morphologies and it was important for defining the desired properties.Keywords: Cu nanoparticles; electrodeposition; boron doped diamond films. INTRODUÇÃONos últimos anos, o interesse por eletrodos modificados com nanopartículas (NPs) tem aumentado, consideravelmente, devido as suas propriedades físico-químicas bastante específicas que podem ser exibidas na escala nanométrica, mas que não são típicas dos materiais bulk correspondentes. 1 Na área eletroquími-ca, particularmente, em eletroanálise, NPs têm sido amplamente utilizadas como nanomatérias funcionais de superfície. Dentre alguns artigos excelentes de revisão publicados na literatura, [2][3][4][5][6] Welch e Compton destacam quatro principais vantagens quanto ao uso de eletrodos modificados com NPs aplicadas em eletroanálise: elevada área superficial efetiva, aumento do transporte de massa, atividade catalítica e controle sobre o microambiente local. 2 Em uma visão mais detalhada, a deposição de NPs resulta em um aumento da rugosidade superficial, que contribui para o aumento da área condutora do eletrodo modificado. Esta condição favorece a cinética de transferência de elétrons reduzindo o sobrepotencial para a ocorrência das reações eletroquímicas. Ao mesmo tempo, a redução do sobrepotencial aumenta a seletividade em uma análise eletroquímica, a qual permite a aplicação de potenciais de operação mais baixos, reduzindo ou mesmo eliminando a possibilidade dos potenciais de eletrólise de outras espécies presentes serem atingidos.Alguns metais, como platina, ouro e prata, têm sido comumente usados como NPs na modificação de eletrodos. Em razão da vasta aplicação eletroanalítica desses nanomateriais, outros metais, tais como paládio, rutênio, cobre e níquel vêm despertando interesse para tal propósito. 6 Entretanto, os resultados esperados são alcançados quando se tem um controle das características físico-químicas do substrato modificado. De forma geral, os substratos comumente usados para a caracterização eletroquímica de NPs estão sujeitos à corrosão (no caso do grafite e carbono vítreo) ou mesmo à formação de óxidos (no caso do titânio e ouro) em elevados potenciais anódi-cos. Estes acontecimentos podem modificar diretamente...

show abstract

The response of some nucleation/growth processes to triangular scans of potential

Cited by 365 publications

References 8 publications

Microstructure, surface chemistry and electrochemical response of Ag|AgCl sensors in alkaline media

Microstructure, surface chemistry and electrochemical response of Ag|AgCl sensors in alkaline media

A comparative study of copper electrodeposition and photoelectrodeposition on boron doped diamond

Influência do eletrólito na eletrodeposição de nanopartículas de Cu sobre eletrodo de diamante dopado com boro

Contact Info

Product

Resources

About