XPS and impedance spectroscopy of some oxygen vacancy conducting solid electrolyte ceramics

Орлюкас, А.Ф.; Салкус, Т.; Kežionis, A.; Venckutė, V.; Kazlauskienė, V.; Miškinis, J.; Laukaitis, Giedrius; Dudonis, J.

doi:10.1016/j.ssi.2010.11.001

Cited by 22 publications

(5 citation statements)

References 23 publications

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“…High-resolution XPS scans were performed for the identification of oxidation states of Zn, O, Co and Li and in all samples. Lorentzian-Gaussian fittings were employed for the deconvolution of XPS spectra into separate peaks using XPSPEAK4.1 software after subtracting the Shirley background [39].…”

Section: Electronic Structuresmentioning

confidence: 99%

Effects of substitutional Li on the ferromagnetic response of Li co-doped ZnO:Co nanoparticles

Awan

Hasanain

Bertino

et al. 2013

J. Phys.: Condens. Matter

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Li co-doped ZnO:Co (Zn0.96-yCo0.04LiyO , y ≤ 0.1) nanoparticles were synthesized by the sol-gel technique and the correlation between the structural, electronic and magnetic properties was investigated. All the samples show a single phase hexagonal (wurtzite) ZnO structure and no secondary phases were detected. Variational trends in lattice parameters suggest the incorporation of Li in the ZnO:Co system in both substitutional and interstitial sites. Detailed electronic studies have been performed by high-resolution x-ray photoelectron spectroscopy (XPS) to determine the states of Zn, O, Co and Li. It was determined that Co substitutes at Zn sites (CoZn) while the O vacancy and Zn defects did not show much variation with increasing Li concentration. Deconvolution of the Li XPS peak showed a clear non-monotonic trend in the variation of the substitutional Li (LiZn) and interstitial Li (Lii) defects with increasing Li concentration in the particles. The magnetization study of the samples showed that the variation of the moment closely followed the trend of variation of the LiZn defects. The data are interpreted in terms of substitutional Li acting as a hole dopant and optimizing the conditions for ferromagnetism in Co-doped ZnO. Interstitial Li is not seen to be playing this role.

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Section: Electronic Structuresmentioning

confidence: 99%

Effects of substitutional Li on the ferromagnetic response of Li co-doped ZnO:Co nanoparticles

Awan

Hasanain

Bertino

et al. 2013

J. Phys.: Condens. Matter

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“…The deconvolution of the O 1s peak was conducted with the same Smart background across the V 2p and O 1s regions. The spectra were divided into three joint components at around 529.6, 530.2, and 531.1 eV, which correspond to the surface lattice oxygen species (O L ), the surface hydroxyl species (O OH ), and the adsorbed water species (O H 2 O ), respectively. − In Figure (c), it is noticed that the content ratio of O OH and O H 2 O increases with the intensive pretreatment. The surface analysis results in Table S5 also illustrated a decrement in the lattice oxygen content.…”

Section: Resultsmentioning

confidence: 99%

Selective Methacrolein Oxidation Catalyzed with Heteropoly Compounds: Effect of the Oxidation State Modulated with Hydrogen Pretreatment

Yang

Chen

et al. 2022

Ind. Eng. Chem. Res.

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The chemical state of catalysts is a vital factor affecting their catalytic performance. Herein, a method for controllable modification of the chemical state was proposed for the heteropoly catalyst in the methacrolein oxidation reaction to methacrylic acid by means of hydrogen pretreatment. The inherent relationship between the chemical state and the catalytic performance of the Keggin catalyst was systematically investigated. The changes in structure and element valence induced by hydrogen pretreatment were characterized with various methods, including XRD, FTIR, UV, Raman, SEM, O2-TPD, XPS, and ESR spectra. The pretreatment conditions were optimized on a fixed-bed tubular reactor, and the favored chemical state of the catalyst was obtained. This report provides an effective approach to activating the Keggin catalyst for oxidation reactions.

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“…The catalysts prepared by the solution reduction method possess a higher Ce 3+ proportion, reflecting a higher concentration of oxygen vacancy. Three characteristic peaks of O 1s spectra, relating to lattice oxygen (O 2− ), surface oxygen (O 2 2− or O − ), [ 30 ] and adsorption oxygen, [ 31,32 ] can be identified from Figure 5b. The surface oxygen vacancy concentration is strongly related to the Pt morphology and the size of CeO 2 support.…”

Section: Resultsmentioning

confidence: 99%

Engineering Dual Active Sites at the Interface between Nanoporous Pt and Nanosized CeO₂ to Enhance Photo‐Thermocatalytic CO Oxidation

Zhang

Song

et al. 2021

Adv Materials Inter

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Effective catalytic oxidation of toxic emissions at low temperatures has great significance on environmental protection. Herein, a novel structure of Pt/CeO2 catalyst, composed of abundant CeO2 clusters captured by nanoporous Pt particles, is designed to enhance the photo‐thermocatalytic CO oxidation by boosting the amount of active sites. The nanosized CeO2 support is fabricated by vacuum thermal decomposition and then the Pt/CeO2 catalyst with a nanoporous structure is synthesized by a one‐pot solution reduction method in a mild condition. The synthesized catalyst exhibits great low‐temperature CO catalytic oxidation activity, and the temperature for 90% CO conversion is 154 °C, achieving comparable catalytic activity with the single‐atom Pt/CeO2 catalyst. Abundant dual active sites, in terms of active oxygen absorbed on the oxygen vacancies and spillover from ceria to Pt, and active Pt sites located near the perimeter of the Pt–CeO2 interface, are formed to improve the photo‐thermocatalytic activity for CO oxidation.

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XPS and impedance spectroscopy of some oxygen vacancy conducting solid electrolyte ceramics

Cited by 22 publications

References 23 publications

Effects of substitutional Li on the ferromagnetic response of Li co-doped ZnO:Co nanoparticles

Effects of substitutional Li on the ferromagnetic response of Li co-doped ZnO:Co nanoparticles

Selective Methacrolein Oxidation Catalyzed with Heteropoly Compounds: Effect of the Oxidation State Modulated with Hydrogen Pretreatment

Engineering Dual Active Sites at the Interface between Nanoporous Pt and Nanosized CeO₂ to Enhance Photo‐Thermocatalytic CO Oxidation

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XPS and impedance spectroscopy of some oxygen vacancy conducting solid electrolyte ceramics

Cited by 22 publications

References 23 publications

Effects of substitutional Li on the ferromagnetic response of Li co-doped ZnO:Co nanoparticles

Effects of substitutional Li on the ferromagnetic response of Li co-doped ZnO:Co nanoparticles

Selective Methacrolein Oxidation Catalyzed with Heteropoly Compounds: Effect of the Oxidation State Modulated with Hydrogen Pretreatment

Engineering Dual Active Sites at the Interface between Nanoporous Pt and Nanosized CeO2 to Enhance Photo‐Thermocatalytic CO Oxidation

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Product

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About

Engineering Dual Active Sites at the Interface between Nanoporous Pt and Nanosized CeO₂ to Enhance Photo‐Thermocatalytic CO Oxidation