Silver electrodeposition on Au(100): structural aspects and mechanism

García, Sara Mallén; Salinas, Daniel; Mayer, C.; Vilche, J. R.; Pauling, H. J.; Vinzelberg, Stefan; Staikov, G.; Lorenz, W.J.

doi:10.1016/0039-6028(94)91135-5

Cited by 43 publications

(33 citation statements)

References 49 publications

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“…It is seen that an excellent linear dependence for potentials from À0.05 V to À0.25 V is obtained. This is the characteristic of multilayer spiral growth mechanism caused by screw dislocations of substrate which are inherited by the Se deposit [29,30]. However, it is very important to remark that for potential of À0.35 V, the current density is a little higher than expected value, which is because the six-electron reaction begins to make a significant contribution the total current density, as can be seen from the cyclic voltammogram in Fig.…”

Section: Resultsmentioning

confidence: 90%

Nucleation and growth of selenium electrodeposition onto tin oxide electrode

Lai

Liu

et al. 2010

Journal of Electroanalytical Chemistry

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Section: Resultsmentioning

confidence: 90%

Nucleation and growth of selenium electrodeposition onto tin oxide electrode

Lai

Liu

et al. 2010

Journal of Electroanalytical Chemistry

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“…This behavior is in agreement with the silver deposition on Au(100) and Au(111) substrates after the deposition of the first silver monolayers. 2,19 In that case, the formation of the underpotential Ag layer that depends on the substrate orientation, is the precursor to the overpotential deposition, i.e., the Ag UPD monolayer is involved in the initial steps of the nucleation and growth processes in the overpotential range. Once the silver monolayer on Au(hkl) is formed, and due to a negligible adsorbate/substrate misfit, the subsequent deposition process occurs as on the same substrate, following a layer-by-layer growth mode.…”

Section: Resultsmentioning

confidence: 99%

“…Such interfacial electrochemical studies have been greatly expanded over the past decade, because these processes can be directly monitored in real time using the Scanning Tunneling Microscopy (STM), which gives direct structural information at electrode surfaces and provides information concerning the progression of the electrochemical phenomenon and/or its reversibility. [1][2][3][4] However, for an in situ study of electrochemical phase formation processes, it is necessary to be aware of possible tip-substrate interactions and their effect on the interpretation of images acquired during the phase formation phenomena. The presence of the probing tip in the electrochemical cell produces a modification of the electrochemical environment due to the specific tipsubstrate configuration.…”

Section: Introductionmentioning

confidence: 99%

In situ STM study of electrocrystallization of Ag on Ag(111)

García

Mayer

Salinas

et al. 2004

J. Braz. Chem. Soc.

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O processo de eletrocristalização foi estudado para o sistema Ag(111)/Ag + , SO 4 utilizando Microscopia Eletrônica de Tunelamento (STM) in situ. Os resultados mostram que a deposição de Ag ocorre preferencialmente nos cantos dos degraus seguidos de um mecanismo de crescimento camada a camada, mas a polarização e as condições de imagem afetam grandemente a cinética local desse processo. Para potenciais da sonda do STM mais positivos do que o potencial de equilíbrio Ag/Ag + , uma dissolução local do substrato, sob a sonda é observada mesmo em sobrepotenciais de substrato muito negativos, onde a densidade da corrente do substrato é catódica. Uma estimativa de densidade de corrente local de deposição no entanto, indica que a velocidade de deposição sob a sonda é reduzida. Esses resultados são explicados pela presença de um campo elétrico entre a sonda e o substrato, o qual afeta a distribuição de potencial diretamente sob a sonda, produzindo um forte apantalhamento do fluxo difusional de íons Ag + .The electrocrystallization process was studied in the system Ag(111)/Ag + , SO 4 = by in situ scanning tunneling microscopy (STM). The results show that Ag deposition occurs preferentially at step edges following a layer-by-layer growth mechanism, but polarization and imaging conditions greatly affect the local kinetics of this process. At STM-tip potentials more positive than the Ag/Ag + equilibrium potential, a local dissolution of the substrate underneath the tip is observed even at low negative substrate overpotentials, at which the overall substrate current density is cathodic. An in situ STM imaging of Ag deposition was possible at sufficiently high negative substrate overpotentials. An estimation of the local deposition current density, however, indicates that the deposition rate underneath the STM-tip is reduced. These results are explained by the presence of an electric field between the STM-tip and the substrate, which affects the potential distribution directly underneath the tip, producing a large shielding of the diffusive flux of Ag + ions.

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“…The system Ag/Au͑100͒ has been largely studied, both experimentally 12,13,21,22 and theoretically. 8,23,24 As stated above, it is well known that the crystallographic misfit between the involved atoms is not important for this system.…”

Section: A Lattice Modelmentioning

confidence: 99%

A model for underpotential deposition in the presence of anions

Giménez¹,

Ramírez-Pastor²,

Leiva³

2010

The Journal of Chemical Physics

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Lattice-gas model of nonadditive interacting particles on nanotube bundles J. Chem. Phys. 134, 064702 (2011); 10.1063/1.3530788 Critical behavior of interacting monomers adsorbed on one-dimensional channels arranged in a triangular crosssectional structure: Mixed interactions along and across the channels A simple model to study the effect of on top coadsorption of anions in underpotential deposition is formulated. It considers a lattice-gas model with pair potential interactions between nearest neighbors. As test system, the electrodeposition of silver on gold is studied by means of grand canonical Monte Carlo simulations. The influence of anions on the adsorption isotherms is analyzed. It is found that as the interaction between silver atoms and anions increases, the monolayer adsorbs at more negative chemical potentials. For large interactions between silver atoms and anions, a expanded structure occurs for the silver monolayer. Ag coverage degree J 12 =-1.0 eV J 12 =-1.2 eV J 12 =-1.4 eV J 12 =-1.6 eV J 12 =-2.0 eV J 22 =0.4 eV FIG. 7. Adsorption isotherms for J 22 = 0.4 eV and several values of J 12 , as indicated. The coverage degree of the Ag atoms, Ag , is plotted as a function of their chemical potential. The chemical potential for anions is considered as anion = 0.0 eV. For each chemical potential the initial state corresponds to the final state of the previous chemical potential. 184703-5Underpotential deposition with anions

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Silver electrodeposition on Au(100): structural aspects and mechanism

Cited by 43 publications

References 49 publications

Nucleation and growth of selenium electrodeposition onto tin oxide electrode

Nucleation and growth of selenium electrodeposition onto tin oxide electrode

In situ STM study of electrocrystallization of Ag on Ag(111)

A model for underpotential deposition in the presence of anions

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