Electron energy loss spectroscopic investigation of Co metal, CoO, and Co3O4 before and after Ar+ bombardment

Hagelin-Weaver, Helena A.E.; Hoflund, Gar B.; Minahan, David M.; Salaita, Ghaleb N.

doi:10.1016/j.apsusc.2004.02.062

Cited by 162 publications

(107 citation statements)

References 83 publications

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“…The main Co 2p 1/2 and Co 2p 3/2 peaks shifted to higher binding energies of 0.4-0.6 eV. The satellite peak at 789.9 eV disappeared, and the satellite intensities for both Co 2p 1/2 and Co 2p 3/2 increased to be higher than 50% of the main peaks as could be expected to be observed in CoO spectrum (Yin et al 2004;Hagelin-weaver et al 2004). The film prepared with a [Co(II)]/[Zn(II)] feed ratio of 0.8 feed ratio ranges between 0.6 and 1, the cobalt region of the XPS spectra showed a distinct feature.…”

Section: Morphology and Structuresupporting

confidence: 51%

“…When the cobalt(II) amount in the electrodeposition solution was increased further to deliver [Co(II)]/[Zn(II)] feed ratio of 0.4, main Co 2p 1/2 peak on the surface was shifted to 795.8 eV and Co 2p 3/2 peak was shifted to 779.9 eV. Main peaks appeared with two satellites at binding energies of 786.4 and 789.9 eV, all again consistent with Co 3 O 4 on the surface (Hagelin-weaver et al 2004). After surface etching of 540 s, a similar transformation from Co 3 O 4 to CoO was observed.…”

Section: Morphology and Structurementioning

confidence: 61%

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Hydrothermal–electrochemical growth of heterogeneous ZnO: Co films

Yilmaz

Ünal

2017

Appl Nanosci

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This study demonstrates the preparation of heterogeneous ZnO: Co nanostructures via hydrothermalelectrochemical deposition at 130°C and -1.1 V (vs Ag/ AgCl (satd)) in dimethyl sulfoxide (DMSO)-H 2 O mixture. Under the stated conditions, ZnO: Co nanostructures grow preferentially along (002) direction. Strength of directional growth progressively increases with the increasing concentration of Co(II) in the deposition bath. Films are composed of hexagonal Wurtzite ZnO, metallic cobalt, and mixed cobalt oxide on the surface and cobalt(II) oxide in deeper levels. Increasing the Co(II) concentration in the deposition bath results in different morphological features as well as phase separation. Platelets, sponge-like structures, cobalt-rich spheres, microislands of cobalt-rich spheres which are interconnected by ZnO network can be synthesized by adjusting [Co(II)]: [Zn(II)] ratio. Growth mechanisms giving rise to these particular structures, surface morphology, crystal structure, phase purity, chemical binding characteristics, and optical properties of the deposits are discussed in detail.

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Section: Morphology and Structuresupporting

confidence: 51%

Section: Morphology and Structurementioning

confidence: 61%

Hydrothermal–electrochemical growth of heterogeneous ZnO: Co films

Yilmaz

Ünal

2017

Appl Nanosci

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“…The position of the lattice oxygen peak does not change upon addition of different amounts of the Co 3 O 4 phase. This is not surprising, since the O 1s peak for Co 3 O 4 is expected around 529.7 eV [50].…”

Section: Spectroscopic Xps Characterizationmentioning

confidence: 99%

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

Grzybek

Stelmachowski

Gudyka

et al. 2016

Applied Catalysis B: Environmental

105

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dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: the role of the interface periphery, Applied Catalysis B, Environmental http://dx.doi.org/10. 1016/j.apcatb.2015.07.027 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. The catalytic tests in deN 2 O reaction revealed that the 10 wt.% of cobalt spinel in supported system is able to reproduce the activity of bare Co 3 O 4 catalyst. However, it was found that the catalyst with the lowest content of Co 3 O 4 equal to 1 wt.% exhibits the highest apparent reaction rate per mass of the spinel active phase. The observed activity was explained basing on the transmission electron microscopy analysis in terms of the dispersion of spinel phase over ceria support. A simple model that accounts for the observed strong dispersion effect is proposed. It consists in a two-step mechanism, where N 2 O is dissociated on the spinel nanograins and the resultant oxygen species are preferentially recombined at the Co 3 O 4 /CeO 2 interface periphery.

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“…The electronic structure of rocksalt CoO results in characteristic satellite structure in core cobalt photoemission [8,[14][15][16][17][18], which is extremely sensitive in intensity and binding energy to the stoichiometry and order of the surface. Co 2p photoemission is shown in Figure 1 for UHVcleaved CoO(1 0 0) with binding energies of 780.4 eV for 2p 3/2 and 796.2 eV for 2p 1/2 photoemission maxima and satellite structure at 786.7 and 802.5 eV for 2p 3/2 and 2p 1/2 , respectively, and are in agreement with literature values [18].…”

Section: Coo(1 0 0)/co 3 O 4 Epitaxymentioning

confidence: 99%