2D oxides on metal materials: concepts, status, and perspectives

Barcaro, Giovanni; Fortunelli, Alessandro

doi:10.1039/c9cp00972h

Cited by 38 publications

(39 citation statements)

References 207 publications

(300 reference statements)

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“…From the analysis of Figure 1B, it is clear that two oxide surfaces can be considered "reducible, " CeO 2 (green) and TiO 2 (blue) because the conditions required for thermodynamically favorable reducibility are attainable. However, for Al 2 O 3 and MgO, these conditions are quite extreme and therefore are usually considered to be non-reducible (Barcaro and Fortunelli, 2019). Hence, the necessary conditions for the emergence of complex defects have been extensively studies, where some authors have identified the formation of temperature defects (Namai et al, 2003a,b), while others have observed vacancies arising only above 400 • C (Esch et al, 2005).…”

Section: What Are Reducible Oxides?mentioning

confidence: 99%

“…In this context, oxide catalysts can widely be used as promising alternatives in order to meet these demanding requirements. Before use in catalysis, reducible oxides have been extensively used in the fields of superconducting physics and spintronics because of their excellent ionic mobility at high temperatures (Barcaro and Fortunelli, 2019). According to Professor Misono: "A catalyst can be called catalytic converter only when it catalyses some reaction useful for practice and the society."…”

Section: Introductionmentioning

confidence: 99%

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Oxygen Defects and Surface Chemistry of Reducible Oxides

et al. 2019

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The magic reducible oxides properties likely are mainly due to the presence of oxygen defects and their rich surface chemistry, which provide a rational pathway to the emergent of entirely new properties. Although significant progress has performed in the last years, it can be stated that they are not fully understood at the nanoscale level so far. This mini-review provides a comprehensive perspective on the oxygen defects and surface chemistry of reducible oxides based on materials with two-dimensional (2D) structure. Thus, in this perspective, we intend to discuss some of the main challenges and opportunities in this important field of research in materials chemistry and engineering. From a practical standpoint, chemical insights from defect-engineering may provide vital clues for improving synthetic methods and understanding fundamental nanoscale properties, driving innovation in the field of reducible oxides based on 2D structure materials.

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Section: What Are Reducible Oxides?mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxygen Defects and Surface Chemistry of Reducible Oxides

et al. 2019

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“…In general, oxide films present physicochemical properties characteristic for the bulk oxide material. However, the 2D confinement in very thin films and the film‐support interaction may lead to unique new properties [13] rendering these materials novel and interesting for technological applications [14, 15] …”

Section: Introductionmentioning

confidence: 99%

Growth and Atomic‐Scale Characterization of Ultrathin Silica and Germania Films: The Crucial Role of the Metal Support

Lewandowski

Tosoni

Gura

et al. 2020

Chemistry A European J

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The present review reports on the preparation and atomic‐scale characterization of the thinnest possible films of the glass‐forming materials silica and germania. To this end state‐of‐the‐art surface science techniques, in particular scanning probe microscopy, and density functional theory calculations have been employed. The investigated films range from monolayer to bilayer coverage where both, the crystalline and the amorphous films, contain characteristic XO4 (X=Si,Ge) building blocks. A side‐by‐side comparison of silica and germania monolayer, zigzag phase and bilayer films supported on Mo(112), Ru(0001), Pt(111), and Au(111) leads to a more general comprehension of the network structure of glass former materials. This allows us to understand the crucial role of the metal support for the pathway from crystalline to amorphous ultrathin film growth.

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“…In the surface science approach [9], first single crystals of the bulk oxides were studied [10,11], followed by planar model systems in which ultrathin V-oxide layers were deposited on single crystal oxide surfaces like α-Al 2 O 3 (0001), CeO 2 (111) or TiO 2 (110) [12][13][14][15] and on the fcc(111) und fcc(100) surfaces of the metals Pt, Rh, Pd, Cu, and Au [16][17][18][19][20]. In the past three decades the synthesis and characterization of ultrathin metal oxide films on metal surfaces has evolved into an own research field [21,22].…”

Section: Introductionmentioning

confidence: 99%

Reactivity and Stability of Ultrathin VOx Films on Pt(111) in Catalytic Methanol Oxidation

2020

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The growth of ultrathin layers of VOx (< 12 monolayers) on Pt(111) and the activity of these layers in catalytic methanol oxidation at 10−4 mbar have been studied with low-energy electron diffraction, Auger electron spectroscopy, rate measurements, and with photoemission electron microscopy. Reactive deposition of V in O2 at 670 K obeys a Stranski–Krastanov growth mode with a (√3 × √3)R30° structure representing the limiting case for epitaxial growth of 3D-VOx. The activity of VOx/Pt(111) in catalytic methanol oxidation is very low and no redistribution dynamics is observed lifting the initial spatial homogeneity of the VOx layer. Under reaction conditions, part of the surface vanadium diffuses into the Pt subsurface region. Exposure to O2 causes part of the V to diffuse back to the surface, but only up to one monolayer of VOx can be stabilized in this way at 10−4 mbar.

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2D oxides on metal materials: concepts, status, and perspectives

Abstract: Two-dimensional oxide-on-metal materials: concepts, methods, and link to technological applications, with 5 subtopics: structural motifs, robustness, catalysis, ternaries, and nanopatterning.

Cited by 38 publications

References 207 publications

Oxygen Defects and Surface Chemistry of Reducible Oxides

Oxygen Defects and Surface Chemistry of Reducible Oxides

Growth and Atomic‐Scale Characterization of Ultrathin Silica and Germania Films: The Crucial Role of the Metal Support

Reactivity and Stability of Ultrathin VOx Films on Pt(111) in Catalytic Methanol Oxidation

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