Systematic XPS studies of metal oxides, hydroxides and peroxides

Dupin, Jean‐Charles; Gonbeau, Danielle; Vinatier, Philippe; Levasseur, Alain

doi:10.1039/a908800h

Cited by 1,841 publications

(1,110 citation statements)

References 42 publications

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“…To identify the origin of the Sr surf we compare the BE of Sr 3d, O 1s, and C 1s features. The values of the Sr 3d, O 1s, and C 1s binding energies (in eV) reported in the literature for different Sr, O, and C containing compounds are summarised in Table 6 [36,57,58,68,69]. The feature at 288.5 eV was clearly observed in the C 1s spectra of the LSC perovskite and LSCC57 composite, thereby implying the possibility of carbonate formation.…”

Section: Surface States Of Co and Sr Cations Carbon And Oxygen Ionsmentioning

confidence: 95%

Identification of surface composition and chemical states in composites comprised of phases with fluorite and perovskite structures by X-ray photoelectron spectroscopy

Konysheva

Francis

2013

Applied Surface Science

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Keywords:X-ray photoelectron spectroscopy (XPS) Surface composition Composites with perovskite and fluorite structures Oxidation state of cerium cations Binding energy a b s t r a c t X-ray photoelectron spectroscopy (XPS) has been used to explore the cation rearrangement between the surface and bulk of grains and the surface chemical states of Ce, Mn, Co, Sr, and O ions in the single phase CeO 2 -based solid solutions and in the two phase (100 − x)La 0.6 Sr 0.4 CoO 3 -xCeO 2 (LSCCx) and (100 − x)La 0.8 Sr 0.2 MnO 3 -xCeO 2 (LSMCx) composites. The well-resolved Ce 3d 5/2 and Ce 3d 3/2 spin-orbit components were determined to study the Ce 4+ to Ce 3+ electronic transition at the surface. The surface of the LSCCx and LSMCx (x = 8-40 mol%) composites is depleted in cerium. Both Ce 4+ and Ce 3+ cations were revealed. The surface fraction of Ce 4+ cations increases with the rise in CeO 2 content in both systems, but it is higher by about a factor of two in the LSCC composites. A strong enrichment of the surface by Co cations was observed for the composites LSCCx (x = 8-40 mol%), implying that the presence of cerium could facilitate the Co surface segregation. A slight Sr surface enrichment compared to the nominal stoichiometry was found for La 0.6 Sr 0.4 CoO 3 , CeO 2 -based solid solutions, LSCC57, and LSMCx (x = 10-57) composites. In contrast, the surface of the LSCCx (x = 10-37) composites is slightly depleted in strontium cations. The O 1s spectra of the LSCC and LSMC composites contain several contributions associated with the lattice oxygen related to the phases with the perovskite and fluorite structures as well as with different surface states. Their contributions vary with CeO 2 content and a chemical origin of the transition metal cations on the B-site in the perovskite structure. The Ce 2 (CO 3 ) 3 -based phase seems to exist at the surface of grains and crystallites in the LSCC57 and LSCM composites.

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Section: Surface States Of Co and Sr Cations Carbon And Oxygen Ionsmentioning

confidence: 95%

Identification of surface composition and chemical states in composites comprised of phases with fluorite and perovskite structures by X-ray photoelectron spectroscopy

Konysheva

Francis

2013

Applied Surface Science

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“…The decoupling of the three O 1s spectra generally gives four curve-fitting components in the spectrum from each sample. The peaks (labelled "i") at binding energy (BE) around 529.4-529.6 eV could be attributed to lattice O 2-(Cu-O, Co-O) [6,8,21], the peaks (denoted "ii") at BE around 530.5-530.8 eV may be treated as the surface oxygen from a wide variation of species such as adsorbed oxygen O -and/or OH -like species, as hydroxyl, carbonate groups, etc [6,8,[22][23][24][25], while the adjacent peaks (labelled "iii" and "iv") at BE around = 531.4-531.5 eV and at BE around 531.8-532.0 eV, respectively, could be assigned as subsurface O -species [26,27]. A relatively flat peak shoulder in the high energy side of O 1s peak (Fig.…”

Section: Synchrotron Radiation Xps Studymentioning

confidence: 99%

Solar absorptance of copper–cobalt oxide thin film coatings with nano-size, grain-like morphology: Optimization and synchrotron radiation XPS studies

Amri

Duan

Yin

et al. 2013

Applied Surface Science

175

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Copper-cobalt oxides thin films had been successfully coated on reflective aluminium substrates via a facile sol-gel dip-coating method for solar absorptance study. The optimum absorptance in the range of solar radiation is needed for further optimum design of this material for selective solar absorber application. Field emission scanning electron microscopy was used to characterize the surface morphology of the coating whereby nano-size, grain-like morphology was observed.Synchrotron with dip-speed 120 mm/min (four cycles). The operational simplicity of the dip-coating system indicated that it could be extended for coating of other mixed metal oxides as well.

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“…4, the position of Co 2p 3/2 for all samples is 779.9 eV, while the position of Co 2p 1/2 is 795.5 eV. It is thus confirmed that cobalt exists in the form of Co 3 O 4 in matrices of MgO [29], and no difference in the electronic state with cobalt loading of 5-15%. This suggests the uniformity and good dispersion of Co species in Co/MgO.…”

Section: Characterization Resultsmentioning

confidence: 53%

A study on N2O catalytic decomposition over Co/MgO catalysts

Shen

et al. 2009

Journal of Hazardous Materials

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Systematic XPS studies of metal oxides, hydroxides and peroxides

Cited by 1,841 publications

References 42 publications

Identification of surface composition and chemical states in composites comprised of phases with fluorite and perovskite structures by X-ray photoelectron spectroscopy

Identification of surface composition and chemical states in composites comprised of phases with fluorite and perovskite structures by X-ray photoelectron spectroscopy

Solar absorptance of copper–cobalt oxide thin film coatings with nano-size, grain-like morphology: Optimization and synchrotron radiation XPS studies

A study on N2O catalytic decomposition over Co/MgO catalysts

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