Photochemical synthesis of AZrO3−X thin films (A=Ba, Ca and Sr) and their characterization

Cabello, G.; Lillo, Luis; Caro, C.; Buono-Core, G.E.; Chornik, B.; Flores, Marcos; Carrasco, Claudia; Rodríguez, Carlos Aníbal

doi:10.1016/j.ceramint.2013.12.118

Cited by 24 publications

(13 citation statements)

References 36 publications

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“…Thus, the new peak at 527.45 eV should be assigned to the O1s peak of Ca-O-Zr hetero-linkages, which would attribute to the base structure of CaZrO 3 . The results also well agree with some other works[35][36][37][38][39][40][41][42]. In addition, the XPS spectra of Ca2p and Zr3d also support the Ca-O-Zr hetero-linkage formation: Ca2p 1/2 shifted from 344.92 to 344.31 eV and that ofCa2p 3/2 from 348.55 to 348.03 eV, together with Zr3d 3/2 shifting from 182.26 to 181.81 eV and that of Zr3d 5/2 from 179.92 to 179.47 eV.…”

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confidence: 93%

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Vapor-phase catalytic dehydration of 2,3-butanediol to 3-buten-2-ol over ZrO2 modified with alkaline earth metal oxides

Duan

Yamada

Kubo

et al. 2017

Applied Catalysis A: General

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Vapor-phase catalytic dehydration of 2,3-butanediol (2,3-BDO) to produce 3-buten-2-ol (3B2OL) was investigated over several monoclinic ZrO 2 (m-ZrO 2) catalysts modified with alkaline earth metal oxides (MOs), such as SrO, BaO, and MgO, to compare with the previously reported CaO/m-ZrO 2. It was found that those modifiers enhanced the 3B2OL formation to the same level as CaO did by loading an appropriate MO content. Among all the tested catalysts, the BaO/m-ZrO 2 calcined at 800 o C with a low BaO content (molar ratio of BaO/ZrO 2 = 0.0452) shows the highest 2,3-BDO conversion (72.4%) and 3B2OL selectivity (74.4%) in the initial stage of 5 h at 350 o C. In order to characterize those catalysts, their catalytic activities, crystal structures, and basic properties were studied in detail. In X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) experiment, it was elucidated that highly dispersed M-O-Zr (M= Ca, Sr, and Ba) hetero-linkages were formed on the surface by loading these MOs onto m-ZrO 2 with an appropriate content and then calcining at 800 o C. It can be concluded that the M-O-Zr hetero-linkages generate the proper base-acid balance for the efficient formation of 3B2OL from 2,3-BDO.

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confidence: 93%

“…Furthermore, some groups also reported that they succeeded in preparing CaZrO 3 at high temperatures over 800 o C [37][38][39][40][41]. (Figure 7a).…”

Section: Catalytic Activity Of Zromentioning

confidence: 99%

Vapor-phase catalytic dehydration of 2,3-butanediol to 3-buten-2-ol over ZrO2 modified with alkaline earth metal oxides

Duan

Yamada

Kubo

et al. 2017

Applied Catalysis A: General

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“…On the other hand, the spin-orbit distance (3d5/2 -3d3/2 splitting) for CaZrO3 species is around 2,4 eV [33] . The comparison of XPS spectra for initial and final Ca-doped sample shows an increase of binding energy from 182,5 to 183.0 eV as well as an increase in 3d5/2 -3d3/2 splitting from 2,2 to 2,5 eV.…”

Section: Resultsmentioning

confidence: 95%

Nickel ferrite supported on calcium-stabilized zirconia for solar hydrogen production by two-step thermochemical water splitting

Reñones

Álvarez-Galván

Ruiz-Matas

et al. 2017

Materials Today Energy

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Solar hydrogen production by thermochemical cycles from water using oxide redox pairs represents a promising technology at medium-long term to storage intermittent solar irradiation. Redox oxides based on nickel ferrite supported on modified zirconia have been prepared and studied for renewable H2 production from water by two-step thermochemical cycles. We report herewith a new material based on nickel ferrite supported on Ca-doped zirconia substrate that presents high efficiency for hydrogen production, which is ascribed to a high active phase dispersion promoted by the inclusion of part of Fe cations in the support lattice and by the formation of calcium zirconate, acting as a physical barrier that hinders sintering.

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“…Additionally, the chemical analysis performed using XPS measurements indicates the presence of a Cu2O/CuO oxides mixture in the anodized surfaces [37,54]. The high resolution Cu2p spectrum (see Figure 2a) shows important contributions at a binding of 932.2 and 933.9 eV; these signals are attributed to Cu + Cu2O, CuO and [49], for the case of the Cu-Auger signal, the Cu + CuO and Cu2O contributions are identified at binding energy of 567.0 and 569.3 eV, respectively (see Figure 2b). Additionally, high resolution O1s spectrum (see Figure 2c) evidences the presence of both CuO and Cu2O oxides as well as hydrated species in the sample, which are in agreement with the above showed Raman results.…”

Section: Resultsmentioning

confidence: 98%

“…Raman experiments were performed ex situ (in air) using a Horiba LabRAM HR spectrometer (Sunnyvale, CA, USA), employing a He/Ne laser (632.8 nm wavelength). Using an XPS-Auger Perkin Elmer Model PHI 1257 spectrometer (Waltham, MA, USA) was employed to determine the chemical composition of samples, by means of HRXPS and using the method described previously [48][49][50]. For AFM measurements, a Nanonics Multi View MV1000 was employed using n-type silicon cantilevers (tip radius ≈ 20 nm; f = 39.4 kHz; Q = 1576) for the intermittent mode.…”

Section: Methodsmentioning

confidence: 99%

Exploration of Copper Oxide Nanoneedle Electrosynthesis Applied in the Degradation of Methylene Blue

et al. 2021

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In this study, we report a low cost, fast and unexplored electrochemical synthesis strategy of copper oxide nanoneedles films as well as their morphological and chemical characterization. The nanostructured films were prepared using electrochemical anodization in alkaline electrolyte solutions of ethylene glycol, water and fluoride ions. The film morphology shows nanoneedle-shaped structures, with lengths up to 1–2 μm; meanwhile, high-resolution X-ray photoelectron spectroscopy (HRXPS) and spectroscopy Raman analyses indicate that a mixture of Cu(II) and Cu(I) oxides, or only Cu(I) oxide, is obtained as the percentage of water in the electrolyte solution decreases. A preliminary study was also carried out for the photocatalytic degradation of the methylene blue (MB) dye under irradiation with simulated sunlight in the presence of the nanoneedles obtained, presenting a maximum degradation value of 88% of MB and, thus, demonstrating the potential characteristics of the material investigated in the degradation of organic dyes.

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Photochemical synthesis of AZrO3−X thin films (A=Ba, Ca and Sr) and their characterization

Cited by 24 publications

References 36 publications

Vapor-phase catalytic dehydration of 2,3-butanediol to 3-buten-2-ol over ZrO2 modified with alkaline earth metal oxides

Vapor-phase catalytic dehydration of 2,3-butanediol to 3-buten-2-ol over ZrO2 modified with alkaline earth metal oxides

Nickel ferrite supported on calcium-stabilized zirconia for solar hydrogen production by two-step thermochemical water splitting

Exploration of Copper Oxide Nanoneedle Electrosynthesis Applied in the Degradation of Methylene Blue

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