Crystal-plane-dependent redox reaction on Cu surfaces

Li, Yangsheng; Chen, Hao; Wang, Weijia; Huang, Wugen; Ning, Yanxiao; Liu, Qingfei; Cui, Yi; Han, Yong; Li, Zhi; Yang, Fan; Bao, Xinhe

doi:10.1007/s12274-020-2791-z

Cited by 27 publications

(34 citation statements)

References 58 publications

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“…The O 1s peak was found blue-shifted to 529.8 eV, which could be attributed to the formation of ordered Cu 2 O 1+x oxide stripes. Nevertheless, surface oxidation of Cu(111) showed no obvious changes in the Cu 2p and Cu LMM spectra (Figure c,d), consistent with our previous study …”

Section: Resultssupporting

confidence: 92%

“…Atomic-scale studies of the oxide–metal interface have benefitted greatly from the construction of the inverse model catalyst, where oxide NSs are deposited onto a planar metal substrate and as such remain conductive for surface science studies. , The structures and phase transitions of supported FeO NSs have been investigated extensively on a variety of metal substrates, including Au(111), − Pd(111), Pt(111), − and Ag(111), using scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and density-functional theory (DFT) calculations. Yet, surface science studies of FeO NSs supported on Cu(111) have been limited, which in part could be attributed to the susceptible oxidation of Cu and the complex nature of various surface oxide phases on Cu(111). − On the other hand, catalytic studies have suggested Cu could significantly enhance the reactivity of iron oxides for WGS, ,, which have thus urged atomic-scale studies on the structural changes of the interface between iron oxides and Cu(111) during the redox treatments and under reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Structural Changes of Iron Oxide Nanostructures On Cu(111)

Liu

Zhao

et al. 2022

J. Phys. Chem. C

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Understanding the structural dynamics of supported iron oxide nanostructures (NSs) and their interfaces with metals is essential for the rational design of iron-oxide-based catalysts for a number of major catalytic reactions. In this study, we have constructed well-defined FeO NSs on Cu(111) to study their surface structures and dynamic changes during the redox treatments using the combination of scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). As deposited FeO NSs were found to exhibit various orientations on Cu(111) with the presence of multilayer FeO x , dislocation, and defect lines on the surface plane of FeO. The oxidation of the FeO/Cu(111) surface in O 2 was facilitated by the presence of FeO NSs, causing the formation of the stripe phase of Cu 2 O 1+x surrounding FeO. Meanwhile, the oxidation of FeO NSs also led to the formation of FeO x clusters with predominantly Fe 3+ species, which were transformed into 3D FeO x nanoparticles (NPs) upon the annealing at 800 K in UHV while no reduction of Fe 3+ species was obvious from XPS. Overall, an irreversible structural dynamics was observed at the atomic level for FeO NSs on Cu(111) during the redox treatments, which furthered our understanding of the FeO−Cu interface.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Dynamic Structural Changes of Iron Oxide Nanostructures On Cu(111)

Liu

Zhao

et al. 2022

J. Phys. Chem. C

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“…The O/Cu(111) surface, obtained by treating with the same condition for the preparation of SiO x films, showed a BE of 530.0 eV, which could be assigned to surface Cu x O (marked "Cu x O/Cu(111)"). 43 The results revealed that the Cu(111) surface was partially oxidized during the preparation of SiO x films. After SiO x was deposited, the O 1s peak shifted to a higher BE and broadened, which could be deconvoluted into two components with BEs centered at 530.3 and 531.7 eV (Figure 2b).…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…The XPS spectra of O 1s at different SiO x coverages are displayed in Figure b. The O/Cu(111) surface, obtained by treating with the same condition for the preparation of SiO x films, showed a BE of 530.0 eV, which could be assigned to surface Cu x O (marked “Cu x O/Cu(111)”) . The results revealed that the Cu(111) surface was partially oxidized during the preparation of SiO x films.…”

Section: Results and Discussionmentioning

confidence: 99%

Structure and Properties of Ultrathin SiO_x Films on Cu(111)

Chen

2022

Langmuir

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The metal−oxide interface plays a crucial role in catalysis, and it has attracted increasing interest in recent years. Cu/SiO 2 , as a common copper-based catalyst, has been widely used in industrial catalysis. However, it is still a challenge to clarify the structures of the interface of Cu−SiO x and the effect on catalytic performance. Herein, we prepared ultrathin SiO x films by evaporating Si onto a Cu(111) surface followed by annealing in an O 2 atmosphere, which were characterized by various surface science techniques. The results showed that a SiO x film could grow nearly layer-by-layer on the Cu( 111) surface in the present condition. Both X-ray photoelectron spectroscopy (XPS) and high-resolution electron energy loss spectroscopy (HREELS) results confirmed the presence of Cu−O−Si and Si−O−Si species. Thermal stability experiments illustrated that the well-ordered silica films were stable under annealing in vacuum. The feature of CO adsorption suggested a CO−Cu δ+ species induced from the Cu δ+ − O−Si. Low-energy ion scattering spectroscopy (LEIS) and XPS results demonstrated that some Cu 2 O appeared on the surface when the 1 ML SiO x /Cu(111) was exposed in O 2 at 353 K.

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“…Over the past few years, many roles of O 2 and H 2 on graphene growth have been studied, including regulating the domain structures, controlling the nucleation density and growth rate, ,− assisting the preparation of single-crystal Cu substrate, ,, as well as inducing the reconstruction of Cu steps and facets. − In this work, we found that trace amounts of oxygen would improve the orientation consistency of the as-grown graphene on Cu(111) by strengthening the interaction between graphene edges and the Cu(111) surface. We further revealed the role of Cu texture on the formation of anomalous grains and the migration of grain boundaries during the thermal annealing process.…”

Section: Introductionmentioning

confidence: 93%

Toward Epitaxial Growth of Misorientation-Free Graphene on Cu(111) Foils

et al. 2021

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The epitaxial growth of single-crystal thin films relies on the availability of a single-crystal substrate and a strong interaction between epilayer and substrate. Previous studies have reported the roles of the substrate (e.g., symmetry and lattice constant) in determining the orientations of chemical vapor deposition (CVD)-grown graphene, and Cu( 111) is considered as the most promising substrate for epitaxial growth of graphene single crystals. However, the roles of gas-phase reactants and graphene−substrate interaction in determining the graphene orientation are still unclear. Here, we find that trace amounts of oxygen is capable of enhancing the interaction between graphene edges and Cu(111) substrate and, therefore, eliminating the misoriented graphene domains in the nucleation stage. A modified anomalous grain growth method is developed to improve the size of the as-obtained Cu(111) single crystal, relying on strongly textured polycrystalline Cu foils. The batch-to-batch production of A3-size (∼0.42 × 0.3 m 2 ) single-crystal graphene films is achieved on Cu(111) foils relying on a self-designed pilot-scale CVD system. The as-grown graphene exhibits ultrahigh carrier mobilities of 68 000 cm 2 V −1 s −1 at room temperature and 210 000 cm 2 V −1 s −1 at 2.2 K. The findings and strategies provided in our work would accelerate the mass production of high-quality misorientation-free graphene films.

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Crystal-plane-dependent redox reaction on Cu surfaces

Cited by 27 publications

References 58 publications

Dynamic Structural Changes of Iron Oxide Nanostructures On Cu(111)

Dynamic Structural Changes of Iron Oxide Nanostructures On Cu(111)

Structure and Properties of Ultrathin SiO_x Films on Cu(111)

Toward Epitaxial Growth of Misorientation-Free Graphene on Cu(111) Foils

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Crystal-plane-dependent redox reaction on Cu surfaces

Cited by 27 publications

References 58 publications

Dynamic Structural Changes of Iron Oxide Nanostructures On Cu(111)

Dynamic Structural Changes of Iron Oxide Nanostructures On Cu(111)

Structure and Properties of Ultrathin SiOx Films on Cu(111)

Toward Epitaxial Growth of Misorientation-Free Graphene on Cu(111) Foils

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Structure and Properties of Ultrathin SiO_x Films on Cu(111)