Surface Chemistry of Ruthenium Dioxide in Heterogeneous Catalysis and Electrocatalysis: From Fundamental to Applied Research

Over, Herbert

doi:10.1021/cr200247n

Cited by 632 publications

(682 citation statements)

References 797 publications

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“…In particular, Ru-oxide films on Ru(0001) [6][7][8] and oxide films on Pt(111) [9][10][11] show a higher CO oxidation rate at nearatmospheric pressures and low temperatures at which pure metals are essentially inactive. The promotional effect of oxide overlayers on the reactivity observed on model planar systems allows one to rationalize the enhanced reactivity observed on highly dispersed metal particles, encapsulated by the supporting oxide due to the a so-called strong metal-support interaction, as has been demonstrated for iron oxide-supported Pt catalysts [12].…”

Section: Introductionmentioning

confidence: 99%

Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

et al. 2014

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Abstract.We studied structure and reactivity of ZnO(0001) ultrathin films grown on Ag (111) and Cu(111) single crystal surfaces. Structural characterization was carried out by scanning tunneling microscopy, Auger electron spectroscopy, low-energy electron diffraction, and temperature programmed desorption. The CO oxidation behavior of the films was studied at low temperature (450 K) at near atmospheric pressures using gas chromatography. For ZnO/Cu(111), it is shown that under reaction conditions ZnO readily migrates into the Cu crystal bulk, and the reactivity is governed by a CuO x oxide film formed in the reaction ambient. In contrast, the planar structure of ZnO films on Ag(111) is maintained, similarly to the previously studied ZnO films on Pt(111). At sub-monolayer coverages, the "inverse" model catalysts are represented by two-monolayer-thick ZnO(0001) islands on Pt(111) and Ag(111) supports. While the CO oxidation rate is considerably increased on ZnO/Pt(111), which is attributed to active sites at the metal/oxide boundary, sub-monolayer ZnO films on Ag(111) did not show such an effect, and the reactivity was inhibited with increasing film coverage. The results are explained by much stronger adsorption of CO on Pt(111) as compared with Ag(111) in proximity to O species at the oxide/metal boundary. In addition, the water-gas shift and reverse water-gas shift reactions were examined on ZnO/Ag(111), which revealed no promotional effect of ZnO on the reactivity of Ag under the conditions studied. The latter finding suggests that wetting phenomena of ZnO on metals does not play a crucial role in the catalytic performance of ZnObased real catalysts in those reactions.

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Section: Introductionmentioning

confidence: 99%

Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

et al. 2014

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“…Also, even though O 3f is fully bonded with three Ru atoms, other works show that it could be a site for weak hydrogen bonding. 30 Before studying surface adsorption, the bulk RuO 2 is relaxed using the variable cell relaxation method and the GGA functional. The cell parameters of bulk RuO 2 are calculated to be a = b = 4.47 Å, c = 3.08 Å which agree well with experimental X-ray diffraction values of a = b = 4.49 Å, c = 3.10 Å.…”

Section: Dft Calculationsmentioning

confidence: 99%

“…Also, some H atoms on the benzene are attracted to the O 3f atoms on the surface, as was predicted from previous DFT work on O 3f as a hydrogen bonding site. 30 On all sites of RuO 2 (110)-Ru including the hollow2, during and after the adsorption, the molecule does not move from its initial site to find its most favorable site. Instead it generally stays on its initial site, and the largest lateral movement that occurs is the rotation of the molecule.…”

Section: Surface Adsorption Sitesmentioning

confidence: 99%

Adsorption of Benzene on the RuO₂(110) Surface

Kim

Yang

et al. 2017

J. Phys. Chem. C

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Hydrocarbon tribopolymer, a type of polymer formed due to friction between surfaces, is a major impediment to the development of micro-and nanoelectromechanical systems (MEMS/NEMS) devices for industrial application. Tribopolymer buildup can prevent MEMS and NEMS from making or breaking electrical contact. We describe the adsorption of benzene (C 6 H 6 ) on the RuO 2 (110) surface using density functional theory. This adsorption is an important initial step in the mechanism of hydrocarbon tribopolymer layer formation on MEMS and NEMS devices.The adsorption interaction is studied by considering three oxygen coverages of RuO 2 (110) and all the possible adsorption sites for benzene. We find that adsorption of benzene on O-poor RuO 2 (110) via C-Ru bonds is stronger than adsorption on the O-rich RuO 2 (110) via H-O bonds. For an in-depth study of the adsorption behavior, we include the van der Waals interaction for a holistic investigation. By incorporating the thermodynamic chemical potentials into the adsorption simulations, we describe a model that can provide guidance for realistic situations.

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“…The phenomenon of catalysis has been the subject of extensive research for many decades in different fields and in all its forms such as heterogeneous, homogeneous and electrochemical [1][2][3][4]. Its importance relies on the fact that, in the presence of catalysts, many chemical processes that in principle require extreme thermal and pressure conditions to occur can be conducted under milder conditions for different Abstract Catalysis is a hot topic in research with the focus on finding catalysts that show better activity or selectivity on processes on technological or industrial interest.…”

Section: Introductionmentioning

confidence: 99%

LEEM and PEEM as Probing Tools to Address Questions in Catalysis

Prieto

Schmidt

2017

Catal Lett

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Catalysis is a hot topic in research with the focus on finding catalysts that show better activity or selectivity on processes on technological or industrial interest. The use of model systems of applicable materials has proven to be a successful approach in the last decades to obtain information on the fundamental properties of these materials, leading eventually to a better understanding how real catalysts work. This knowledge is extremely important in the sense that it allows an optimization of the catalyst composition, thus leading to a rational design of new materials. For these fundamental studies, a variety of probing techniques such as X-ray photo-electron spectroscopy, scanning tunnel microscopy, and temperature programmed desorption have been applied. In this article, we discuss how low energy electron microscopy (LEEM) and photoemission electron microscopy (PEEM) can contribute to the fundamental understanding of relevant surface processes taking place on model catalysts. Also, the capability of these techniques on addressing open questions in catalysis is discussed

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Surface Chemistry of Ruthenium Dioxide in Heterogeneous Catalysis and Electrocatalysis: From Fundamental to Applied Research

Cited by 632 publications

References 797 publications

Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

Adsorption of Benzene on the RuO₂(110) Surface

LEEM and PEEM as Probing Tools to Address Questions in Catalysis

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Surface Chemistry of Ruthenium Dioxide in Heterogeneous Catalysis and Electrocatalysis: From Fundamental to Applied Research

Cited by 632 publications

References 797 publications

Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

Adsorption of Benzene on the RuO2(110) Surface

LEEM and PEEM as Probing Tools to Address Questions in Catalysis

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Product

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Adsorption of Benzene on the RuO₂(110) Surface