Reconstruction and electrochemical oxidation of Au(110) surface in 0.1 M H2SO4

Yoshida, Kōji; Kuzume, Akiyoshi; Broekmann, Peter; Pobelov, Ilya V.; Wandlowski, Thomas

doi:10.1016/j.electacta.2014.06.162

Cited by 25 publications

(19 citation statements)

References 42 publications

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“…Thus, we clearly prove that upon cathodic polarization, the Au(110) surface becomes reconstructed in the [BMIm][BF 4 ] IL. A similar potential induced reconstruction was observed previously in aqueous electrolytes and by us in Ar‐saturated [BMIm][BF 4 ] (Figures S5b–d). It is obvious that the CO 2 RR itself has only a minor or even no influence on the observed surface reconstruction.…”

Section: Methodssupporting

confidence: 88%

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Surface Structure Sensitivity of CO₂ Electroreduction on Low‐Index Gold Single Crystal Electrodes in Ionic Liquids

Ehrenburg

Broekmann

et al. 2018

ChemElectroChem

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Golden contest: CO2 electroreduction in room‐temperature ionic liquids is highly sensitive towards the gold electrode surface structure. An Au(110) surface is by far the most active among low‐index Au(hkl) facets irrespective of the chemical nature of the IL used as the electrolyte.The activity of low‐index Au(hkl) single crystal electrodes towards CO2 electroreduction (CO2RR) was examined for eight room temperature ionic liquids (ILs) by means of cyclic voltammetry. We demonstrate that CO2RR is highly sensitive towards the electrode surface structure, with the Au(110) surface being by far the most active irrespective of the chemical nature of the IL used as electrolyte. The activity of all three low‐index Au(hkl) surfaces towards CO2RR decreases upon multiple potential cycling. In situ scanning tunneling microscopy indicates that this deactivation is related to massive Au surface restructuring processes taking place in ILs due to the potential–induced reconstruction and lifting of the surface reconstruction. Additionally, the Au(111) surface undergoes severe etching at the potentials of CO2RR, whereas we do not observe this etching process for Au(110).

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Section: Methodssupporting

confidence: 88%

“…We also notice that the Au(110) surface is reconstructed (thermally‐induced reconstruction) after flame annealing and cooling in Ar. When we bring the electrode in contact with the IL solution at 0.3 V, the thermally induced reconstruction is lifted.…”

Section: Methodsmentioning

confidence: 80%

Surface Structure Sensitivity of CO₂ Electroreduction on Low‐Index Gold Single Crystal Electrodes in Ionic Liquids

Ehrenburg

Broekmann

et al. 2018

ChemElectroChem

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“…[61] More interestingly, through an electrochemical scanning tunnelling microscopy (EC-STM) analysis, they claimed that the Au(110) surface developed the typical (1x2)-Au(110)) reconstruction upon the application of cathodic potential. Similar findings were exposed by Kolb [66] and Yoshida et al [67] at relatively milder cathodic potentials in H 2 SO 4 (in the absence of CO 2 ). Based on these observations, it is appropriate to assume that Au(hkl) electrodes have reconstructed surfaces (Au(111)-(1x23), hex-Au(100) and (1x2)-Au (110)) under CO 2 RR conditions.…”

Section: Structure Sensitivity Towards the Production Of Co: Single-csupporting

confidence: 88%

“…More interestingly, through an electrochemical scanning tunnelling microscopy (EC‐STM) analysis, they claimed that the Au(110) surface developed the typical (1x2)‐Au(110)) reconstruction upon the application of cathodic potential. Similar findings were exposed by Kolb and Yoshida et al . at relatively milder cathodic potentials in H 2 SO 4 (in the absence of CO 2 ).…”

Section: Structure Sensitivity In Co2 Reductionsupporting

confidence: 87%

“…Based on these observations, it is appropriate to assume that Au(hkl) electrodes have reconstructed surfaces (Au(111)‐(1x23), hex‐Au(100) and (1x2)‐Au(110)) under CO 2 RR conditions. The surface reconstruction can be thermally induced during the preparation of the electrode via flame annealing or it can be electrochemically generated via the application of cathodic potentials . The affinity of (110) and stepped surface configurations towards CO 2 and CO (electrochemically produced from CO 2 at the surface) was observed for Pt(110) as well .…”

Section: Structure Sensitivity In Co2 Reductionmentioning

confidence: 99%

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Structure‐Sensitivity and Electrolyte Effects in CO₂ Electroreduction: From Model Studies to Applications

et al. 2019

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Aiming to reduce anthropogenic CO2 emissions, there is an urgent demand to develop more efficient and affordable technologies which convert CO2 into valuable feedstock molecules. The use of renewable electricity is a promising and sustainable approach to overcome this environmental issue, while producing valuable chemicals and clean fuels. However, the CO2 electroreduction reaction (CO2RR) still shows two main gaps: poor selectivity and required large overpotentials make the process not profitable enough. To overcome these challenges, model studies on single‐crystalline surfaces aiming to find the relations between surface structure/electrolyte interactions and activity/selectivity are necessary. In these model studies, tuning the electrolyte composition is also key for the fundamental understanding of the CO2RR. In this review, we first discuss the structure‐activity‐selectivity relations from studies on well‐ordered surfaces, i. e., single crystalline electrodes, for the CO2RR. We then summarise the role of the electrolyte, presenting work on classical aqueous solvents as well as non‐aqueous electrolytes such as ionic liquids. We illustrate the importance of carrying out studies on well‐defined electrified interfaces in order to get deep fundamental insights on the mechanism of the CO2RR, as well as scaling the process for real applications. Ultimately, this knowledge will be essential to rationally design the catalyst with tailored activity and selectivity for CO2 reduction.

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Metal–Electrolyte Interfaces

Nowicki¹,

Wandelt²

2020

Surface and Interface Science

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Reconstruction and electrochemical oxidation of Au(110) surface in 0.1 M H2SO4

Cited by 25 publications

References 42 publications

Surface Structure Sensitivity of CO₂ Electroreduction on Low‐Index Gold Single Crystal Electrodes in Ionic Liquids

Surface Structure Sensitivity of CO₂ Electroreduction on Low‐Index Gold Single Crystal Electrodes in Ionic Liquids

Structure‐Sensitivity and Electrolyte Effects in CO₂ Electroreduction: From Model Studies to Applications

Metal–Electrolyte Interfaces

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Reconstruction and electrochemical oxidation of Au(110) surface in 0.1 M H2SO4

Cited by 25 publications

References 42 publications

Surface Structure Sensitivity of CO2 Electroreduction on Low‐Index Gold Single Crystal Electrodes in Ionic Liquids

Surface Structure Sensitivity of CO2 Electroreduction on Low‐Index Gold Single Crystal Electrodes in Ionic Liquids

Structure‐Sensitivity and Electrolyte Effects in CO2 Electroreduction: From Model Studies to Applications

Metal–Electrolyte Interfaces

Contact Info

Product

Resources

About

Surface Structure Sensitivity of CO₂ Electroreduction on Low‐Index Gold Single Crystal Electrodes in Ionic Liquids

Surface Structure Sensitivity of CO₂ Electroreduction on Low‐Index Gold Single Crystal Electrodes in Ionic Liquids

Structure‐Sensitivity and Electrolyte Effects in CO₂ Electroreduction: From Model Studies to Applications