Electronic properties of CoO(100) surfaces: Defects and chemisorption

Mackay, Janet L.; Henrich, Victor E.

doi:10.1103/physrevb.39.6156

Cited by 39 publications

(22 citation statements)

References 43 publications

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“…It is attributed to adsorbed OH species resulting from dissociation of water to form OH+H. The two peaks are due to the 1π and 3σ orbitals of OH as interpreted similarly for OH in NaOH [341] and on other metal-oxides [58,[342][343][344]. We also attribute the features between -5 and -10 eV to adsorbate induced changes in the substrate emission and possibly to emission from the coadsorbed H atom.…”

Section: (I) Electronic Structures Of Adsorbatesmentioning

confidence: 78%

“…For this reason, water dissociation on metals is often observed only when O is preadsorbed [58], as was observed first on Pt(111) [351]. On non-polar oxide surfaces, such as CoO(100) [342] and NiO(100) [64,344] dissociative adsorption is found to occur only at defects, whereas the corresponding regular surface areas are inert. Dissociative adsorption was observed on Ti 3+ rich Ar + -bombarded surfaces, such as Ti 2 O 3 (047) [352], TiO 2 (100) [353], SrTiO 3 (100) [354], whereas molecular adsorption was observed on the respective stoichiometric regular surfaces.…”

Section: Discussionmentioning

confidence: 95%

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Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Weiß

Ranke

2002

Progress in Surface Science

584

610

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Metal-oxide based catalysts are used for many important synthesis reactions in the chemical industry. A better understanding of the catalyst operation can be achieved by studying elemantary reaction steps on well-defined model catalyst systems. For the dehydrogenation of ethylbenzene to styrene in the presence of steam both unpromoted and potassium promoted iron-oxide catalysts are active. Here we review the work done over unpromoted single-crystalline FeO(111), Fe 3 O 4 (111) and α-Fe 2 O 3 (0001) films grown epitaxially on Pt(111) substrates. Their geometric and electronic surface structures were characterized by STM, LEED, electron microscopy and electron spectroscopic techniques. In an integrative approach, the interaction of water, ethylbenzene and styrene with these films was investigated mainly by thermal desorption and photoelectron emission spectroscopy. The adsorptiondesorption energetics and kinetics depend on the oxide surface terminations and are correlated to the electronic structures and acid-base properties of the corresponding oxide phases, which reveal insight into the nature of the active sites and into the catalytic function of semiconducting oxides in general. Catalytic studies, using a batch reactor arrangement at high gas pressures and post reaction surface analysis, showed that only α-Fe 2 O 3 (0001) containing surface defects is catalytically active, whereas Fe 3 O 4 (111) is always inactive. This can be related to the elementary adsorption and desorption properties observed in ultrahigh vacuum, which indicates that the surface chemical properties of the iron-oxide films do not change significantly across the "pressure-gap". A model is proposed according to which the active site involves a regular acidic surface sites and a defect site next to it. The results on metal-oxide surface chemistry also have implications for other fields, such as environmental science, biophysics and chemical sensors.-2 -"2kyEi9FYSQjBVrZxIPQ.FHIAC_WRa02_review.doc", Datum: 19.02.03

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Section: (I) Electronic Structures Of Adsorbatesmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 95%

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Weiß

Ranke

2002

Progress in Surface Science

584

610

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“…CoO in the zinc blende structure was prepared by decomposing Co acetate in a nitrogen atmosphere [10]. Risbud et al [11] used the thermolytic decomposition of Co(acac) 2 in refluxing benzyl ether to obtain CoO with fcc-Co phase while decomposition of Co(acac) 3 (acac = acetylacetonate) in oleylamine was also applied to synthesize wurtzite CoO [12]. Moreover, different CoO nanocrystals, such as nanoparticles [13][14][15][16], nanorod [17], nanoplatelet [18] have also been reported.…”

Section: Introductionmentioning

confidence: 99%

“…As one kind of transition-metal monoxides, cobaltous oxide (CoO) has attracted much attention due to its interesting and distinctive structures and properties [1][2][3][4][5], and thus has been widely used for lithium-ion battery, cemented carbide, catalyst and many electronic components [6][7][8]. Up to the present, considerable researches have been devoted to study the preparation methods of new shaped and structured CoO.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis, characterization and electrochemical properties of cuspate deltoid CoO crystallites

Cao

et al. 2009

Journal of Alloys and Compounds

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“…4,6 Water is one oxidant commonly encountered under ambient conditions, and most air-exposed TMOs are covered with one or more hydroxylated layers. 7 While hydroxylation occurs rapidly under ultrahigh vacuum ͑UHV͒ only at isolated defect sites, 8,9 air-exposed TMO substrates can form relatively thick hydroxylated layers that persist in UHV to temperatures of 973 K or higher for substantial periods of time. As a result, it is not surprising to find a significant fraction of surface oxide as hydroxyl on air-exposed materials using standard UHV-based surface analytical techniques One example of this is in O 1s photoemission spectrum, 10 where TMO lattice oxide gives a characteristic feature at a binding energy of approximately 529.6 eV and hydroxyls are found 1-2 eV higher.…”

Section: Introductionmentioning

confidence: 99%

Nature of oxygen at rocksalt and spinel oxide surfaces

Langell

Kim

Pugmire

et al. 2001

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The chemical environment of oxygen in cobalt-containing metal oxides with compositions͑M,MЈϭMn,Ni,Co͒ has been studied by Auger, x-ray and ultraviolet photoelectron, and high resolution electron energy loss spectroscopies. While there is a single type of lattice oxygen in the bulk structure of simple rocksalt and spinel oxides, the nature of oxygen at the surface of the spinel oxides is considerably more complex. Photoemission from core oxygen states in these materials often shows multiple peaks and satellite structure which have been attributed to a range of intrinsic and extrinsic oxygen states. All of these 3d transition metal oxides show a single, intense O 1s core photoemission peak at approximately 529.6 eV. In the spinel materials, a second state at 531.2 eV is also observed and is shown to be intrinsic to the spinel surface and not a result of hydroxylation or other surface contaminant. Similar photoemission features in Fe 3 O 4 were previously attributed to final state effects; however, the nature of the multiple final states remains to be elucidated.

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Electronic properties of CoO(100) surfaces: Defects and chemisorption

Cited by 39 publications

References 43 publications

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Facile synthesis, characterization and electrochemical properties of cuspate deltoid CoO crystallites

Nature of oxygen at rocksalt and spinel oxide surfaces

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