Electrochemical Potential Stabilization of Reconstructed Au(111) Structure by Monolayer Coverage with Graphene

Yasuda, Satoshi; Kumagai, Ryota; Nakashima, Koji; Murakoshi, Kei

doi:10.1021/acs.jpclett.5b01488

Cited by 24 publications

(29 citation statements)

References 48 publications

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“…1. The interpretation of the voltammetric feature of Au(111) has been reported before [17][18][19] In a highly acidic electrolyte (0 < pH < 1), the main species of antimony is SbO + as reported by Wu et al [9]. The following small peak C2 (~ +0.28 V) is due to the reduction of oxygenous Sb(III) species from bulk solution.…”

Section: Chemicals Materials and Electrolytesupporting

confidence: 53%

Antimony deposition onto Au (111) and insertion of Mg

Zan¹,

Xing²,

Abd-El-Latif³

et al. 2019

Preprint

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Magnesium based secondary batteries have been regarded as a viable alternative compared to the immensely popular Li-ion systems owing to its high volumetric capacity. One of the largest challenges is the selection of Mg anode material since the insertion/extraction processes are kinetically slow because the large ionic radius and high charge density of Mg2+ compared with Li+. We prepared very thin films of Sb by electrodeposition on an Au (111) substrate. Monolayer and multilayer deposition (up to 20 Monolayer) were characterized by cyclic voltammetry and STM (Scanning-Tunneling-Microscope). Monolayer deposition results in a characteristic row structure; the monolayer is commensurate in one dimension, but not in the other. The row structure is to some extent maintained after deposition of further layers. After dissolution of the multilayers of Sb the substrate is roughened on the atomic scale due to alloy formation, as demonstrated by CV and STM. Further multilayer deposition correspondingly leads to rough deposit with protrusion of up to 3 nm. The cyclic voltammogram for Mg insertion/de-insertion from MgCl2/AlCl3/Tetraglyme (MACC/TG) electrolyte into/from Sb modified electrode shows a positive shift (400 mV) of the onset potential of Mg deposition compared to that at bare Au electrode. From the charge of Mg deposition, we find that the ratio of Mg to Sb is 1:1; and this somewhat less than expected for the Mg3Sb2 alloy.

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Section: Chemicals Materials and Electrolytesupporting

confidence: 53%

Antimony deposition onto Au (111) and insertion of Mg

Zan¹,

Xing²,

Abd-El-Latif³

et al. 2019

Preprint

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“…MoS 2 and MoSe 2 monolayers were grown on Au(111) surfaces by chemical vapor deposition. Figure a shows a representative optical image of a Au bead with a (111)‐facet surface produced by the method of Clavilier et al, which is a commonly used technique for obtaining an atomically flat Au crystal surface . As indicated by the white dotted circles, sub‐millimeter (111) crystal surfaces can be produced on the Au bead.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1a shows a representative optical image of a Au bead with a (111)-facet surface produced by the method of Clavilier et al, [16] which is a commonly used technique for obtaining an atomically flat Au crystal surface. [17] As indicated by the white dotted circles, sub-millimeter (111) crystal surfaces can be produced on the Au bead. STM measurements confirmed a herringbone Au(111) reconstructed pattern on large terrace and a hexagonal lattice structure with a lattice constant of 0.29 nm, corresponding to the interatomic spacing of the Au(111) lattice (0.288 nm).…”

Section: Resultsmentioning

confidence: 99%

Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS₂ and MoSe₂ on Au(111)

Yasuda

Takahashi

Osaka

et al. 2017

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Making contact of transition metal dichalcogenides (TMDCs) with a metal surface is essential for fabricating and designing electronic devices and catalytic systems. It also generates strain in the TMDCs that plays significant role in both electronic and phonon structures. Therefore, detailed understanding of mechanism of the strain generation is important to fully comprehend the modulation effect for the electronic and phonon properties. Here, MoS and MoSe monolayers are grown on Au surface by chemical vapor deposition and it is demonstrated that the contact with a crystalline Au(111) surface gives rise to only out-of-plane strain in both MoS and MoSe layers, whereas no strain generation is observed on polycrystalline Au or SiO /Si surfaces. Scanning tunneling microscopy analysis provides information regarding consequent specific adsorption sites between lower S (Se) atoms in the SMoS (SeMoSe) structure and Au atoms via unique moiré superstructure formation for MoS and MoSe layers on Au(111). This observation indicates that the specific adsorption sites give rise to out-of-plane strain in the TMDC layers. Furthermore, it also leads to effective modulation of the electronic structure of the MoS or MoSe layer.

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“…This also supports the general procedure of Pt single crystal annealing under Ar/CO atmosphere, allowing for new insights in the underlying mechanisms of step mobility and stability. In a recent work of Yasuda et al, the focus was shifted toward stabilizing reconstructed surfaces, specifically the reconstructed Au(111), by adding a monolayer of graphene by atmospheric pressure chemical vapor deposition . The authors concluded that both a protection from the double layer and from anion adsorption shielded the gold surface and maintained its stability over a wide potential range (up to +1.35 V vs Ag/AgCl (saturated KCl)) and even over an extended period of time.…”

Section: Imaging Of Catalyst Surface Structurementioning

confidence: 99%

Electrochemical Scanning Probe Microscopies in Electrocatalysis

et al. 2018

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surface coordination, strain effects, [6][7][8][9] ligand effects, [10,11] ensemble effects, [12] and the electrolyte composition. [13] A detailed understanding of these effects requires experimental and computational procedures to investigate the working mechanisms of the electrocatalysis. Ideally, atomically resolved topographic and chemical information of the catalyst surface under reaction conditions is required. Transmission electron microscopy (TEM) has been reported to be capable of in operando investigation of catalyst structures while catalytic reactions are taking place. [14] However, the instrumentation utilized for such purpose has very strong restrictions and realistic operating conditions cannot be easily applied so far. Alternatively, scanning probe microscopies (SPMs) and electrochemical scanning probe microscopies (EC-SPMs) are able to perform structural measurements of catalytic systems under reaction conditions with resolution down to atomic scales. Normally, EC-SPMs, for instance electrochemical scanning tunneling microscopy (EC-STM), electrochemical atomic force microscopy (EC-AFM), and scanning electrochemical potential microscopy (SECPM), can provide structural information on the solid side of the electrode/electrolyte interface at the atomic level for conductive samples (EC-STM is limited in the case of semi/nonconductive samples). However, these techniques usually lack the capability of chemical sensitivity, ultrahigh resolution reactivity monitoring, and probing the property of the electrolyte side of the interface. One well-developed exception is the scanning electrochemical microscopy (SECM), which will also be discussed in detail within this review. Additionally, SECM and related methods permit gleaning information about the electrolyte side of the electrochemical interface. However, the resolution of SECM and related methods is limited by the size of the SECM-probe and the working principle of SECM.In this review, first a very brief overview on electrocatalysis and on the importance of model substrates for understanding the fundamental underlying principles is given. Thereafter, the operational principle of different SPM techniques is summarized. The main focus of the work lies then on the application of the techniques to study phenomena important for electrocatalysis, including surface topography and adsorption processes. Within that context, also the application of room Improvements toward highly efficient electrochemical energy conversion require a detailed understanding of the underlying electrochemical processes at electrified solid-liquid interfaces. In situ and in operando studies by means of electrochemical scanning probe microscopy (EC-SPM) have become indispensable experimental tools due to their capability of resolving surface topography down to the atomic level even within the harsh environment of electrolytes. EC-SPM methodologies have thus contributed tremendously to the current understanding of electrocatalysis. In this review article, recent achievements in complement...

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Electrochemical Potential Stabilization of Reconstructed Au(111) Structure by Monolayer Coverage with Graphene

Cited by 24 publications

References 48 publications

Antimony deposition onto Au (111) and insertion of Mg

Antimony deposition onto Au (111) and insertion of Mg

Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS₂ and MoSe₂ on Au(111)

Electrochemical Scanning Probe Microscopies in Electrocatalysis

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Electrochemical Potential Stabilization of Reconstructed Au(111) Structure by Monolayer Coverage with Graphene

Cited by 24 publications

References 48 publications

Antimony deposition onto Au (111) and insertion of Mg

Antimony deposition onto Au (111) and insertion of Mg

Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS2 and MoSe2 on Au(111)

Electrochemical Scanning Probe Microscopies in Electrocatalysis

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Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS₂ and MoSe₂ on Au(111)