Understanding the copper underpotential deposition process at strained gold surface

Yang, Mingzhu; Zhang, Haixia; Deng, Qibo

doi:10.1016/j.elecom.2017.07.029

Cited by 13 publications

(13 citation statements)

References 47 publications

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“…Therefore, upd of a metal monolayer onto polycrystalline or single-crystal substrates of a foreign metal has been studied intensively. These investigations included various substrates such as Au, Pt, Ag, Cu, Rh, Ru, Pd, and many deposited ions like Ag + [13,14], Cu 2+ [15][16][17][18][19][20][21][22][23][24], Cd 2+ [25], Pb 2+ [26][27][28][29][30], Tl + [31][32][33][34], Cd 2+ [35,36], Hg 2+ [37], Sn 2+ [38,39], Bi 3+ [30,[40][41][42][43][44][45], Ge 4+ [46][47][48], Sb 2+ [49][50][51], and Ni 2+ [52]. The charge corresponding to the upd permits researchers to estimate the amount of deposited metal.…”

Section: The Upd Metalsmentioning

confidence: 99%

“…A large number of studies concerns the Cu upd on gold single-crystal Au(1 1 1) [16,18,20,23,[58][59][60][61][62][63][64][65]. Investigations on the electrode surface permitted to provide evidences of the Cu upd species at the strained gold surface [24,66]. It is difficult to calculate the upd shift of copper ions using electrolytes containing different anions because of their effect.…”

Section: The Upd Metalsmentioning

confidence: 99%

“…Figure 6 shows a schematic representation of the structure of a lead monolayer on Au(1 1 1). A technique named Dynamic Electro-Chemo-Mechanical Analysis (DECMA) has been developed, which permits assessment of the strain effect on the adsorption process during Cu upd [24].…”

Section: Pb On Aumentioning

confidence: 99%

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Probing the Surface of Noble Metals Electrochemically by Underpotential Deposition of Transition Metals

et al. 2019

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The advances in material science have led to the development of novel and various materials as nanoparticles or thin films. Underpotential deposition (upd) of transition metals appears to be a very sensitive method for probing the surfaces of noble metals, which is a parameter that has an important effect on the activity in heterogeneous catalysis. Underpotential deposition as a surface characterization tool permits researchers to precisely determine the crystallographic orientations of nanoparticles or the real surface area of various surfaces. Among all the work dealing with upd, this review focuses specifically on the main upd systems used to probe surfaces of noble metals in electrocatalysis, from poly‒ and single-crystalline surfaces to nanoparticles. Cuupd is reported as a tool to determine the active surface area of gold‒ and platinum‒based bimetallic electrode materials. Pbupd is the most used system to assess the crystallographic orientations on nanoparticles’ surface. In the case of platinum, Bi and Ge adsorptions are singled out for probing (1 1 1) and (1 0 0) facets, respectively.

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Section: The Upd Metalsmentioning

confidence: 99%

Section: The Upd Metalsmentioning

confidence: 99%

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Probing the Surface of Noble Metals Electrochemically by Underpotential Deposition of Transition Metals

et al. 2019

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“…As an alternative method, the surface strain can be achieved by mechanical strategy. Recent studies about the dynamically mechanical strain indicate that the mechanical method can significantly change the electrocatalytic activity of the electrode material of interest [25,26,27]. However, it is inconvenient in practical applications using the dynamic strain induced by the mechanical stretching.…”

Section: Introductionmentioning

confidence: 99%

A Simple Mechanical Method to Modulate the Electrochemical Electrosorption Processes at Metal Surfaces

2019

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The coupling of electrochemical processes and surface strain has been widely investigated in the past. The present work briefly introduces a simple method to modulate the electrochemical process at metal surfaces by mechanical bending. In this way, the static strain at the metal layer can reach the order of 1%. The cyclic voltammogram was used to study the electrosorption process of oxygen species at sputtered metal surfaces under different strain states. The experimental results show that the desorption peak potential of oxygen at the Au surface shifted positively by tensile strain, whereas the desorption peak potential at the Pt surface shifted negatively. This phenomenon indicates that tensile strain has an opposite effect on the electrosorption process for Au and Pt surfaces. Our results agree with the previous reports on the potential variation induced by dynamic strain. This work thus offers a simple method to modulate the electrosorption process at metal surfaces and then to enhance the reactivity of metal electrodes.

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“…Based on the literature about the electrochemical actuation of nanoporous metals, the direct link between macroscopical strain and charge induced by electrochemical potential can be shown in a fundamental expression as [ 17 , 22 , 41 ]:

where K denotes the bulk modulus of the metal; ρ is the density of the solid phase; and m is the sample mass. The parameter ς describes the coupling strength between the surface mechanics and the electrode process and can be quantified by two independent measurements: (i) from the variation of electrode potential ( E ) with surface strain ( ε ) [ 12 , 13 , 14 , 42 , 43 ], and (ii) from the variation of surface stress ( f ) with charge density ( q ) [ 15 , 16 , 17 ]. The negative-valued ς reported in the electrochemical capacitive process revealed that positive charge induced the expansion of nanoporous gold [ 31 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

The Mechanical Effect of MnO2 Layers on Electrochemical Actuation Performance of Nanoporous Gold

Han

Wei

et al. 2020

Nanomaterials

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This study investigated the electrochemical actuation behavior of nanoporous material during the capacitive process. The length change of nanoporous gold (npg) was in situ investigated in a liquid environment using the dilatometry technique. The mechanical effect of MnO2 layers was introduced in this work to improve the actuation characteristics of the npg samples. Our work found that the actuation behavior of npg sample could be significantly modulated with a covering of MnO2 layers. The electrochemical actuation amplitude was efficiently improved and strongly dependent on the thickness of MnO2 layers covered. Aside from the amplitude, the phase relation between the length change and the electrode potential was inverted when covering the MnO2 layer on the npg samples. This means the expansion of the npg samples and the contraction of samples covered with the MnO2 layer when electrochemical potential sweeps positively. A simple finite element model was built up to understand the effect of the MnO2 layer. The agreement between the simulation result and the experimental data indicates that the sign-inverted actuation-potential response of nanoporous gold contributes to the mechanical effect of MnO2. It is believed that our work could offer a deep understanding on the effect of the MnO2 layer on the electrochemical actuation and then provide a useful strategy to modulate the actuation performance of nanoporous metal materials.

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Understanding the copper underpotential deposition process at strained gold surface

Cited by 13 publications

References 47 publications

Probing the Surface of Noble Metals Electrochemically by Underpotential Deposition of Transition Metals

Probing the Surface of Noble Metals Electrochemically by Underpotential Deposition of Transition Metals

A Simple Mechanical Method to Modulate the Electrochemical Electrosorption Processes at Metal Surfaces

The Mechanical Effect of MnO2 Layers on Electrochemical Actuation Performance of Nanoporous Gold

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