Speciation of Cr(<scp>iii</scp>) in intermediate phases during the sol–gel processing of Cr-doped SrTiO<sub>3</sub>powders

Lehuta, Keith A.; Kittilstved, Kevin R.

doi:10.1039/c3ta14475e

Cited by 19 publications

(22 citation statements)

References 53 publications

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“…Figure 3 shows the XRD pattern of SrTiO 3 prepared under optimum conditions. Compared with the standard card, diffraction peaks at 2θ = 23.0°, 32.4°, 40.4°, 57.8°, 67.8°, 77.2°, and 79.9° belonged to the 100, 110, 111, 200, 211, 220, and 310 of the crystal phase of SrTiO 3 [ 10 , 11 , 12 ], respectively. It can be seen that the prepared SrTiO 3 had a good crystal form and a high diffraction peak intensity.…”

Section: Resultsmentioning

confidence: 99%

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

et al. 2018

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SrTiO3 and Ce4+ doped SrTiO3 were synthesized by a modified sol–gel process. The optimization synthesis parameters were obtained by a series of single factor experiments. Interesting phenomena are observable in Ce4+ doped SrTiO3 systems. Sr2+ in SrTiO3 system was replaced by Ce4+, which reduced the surface segregation of Ti4+, ameliorated agglomeration, increased specific surface area more than four times compared with pure SrTiO3, and enhanced quantum efficiency for SrTiO3. Results showed that Ce4+ doping increased the physical adsorption of H2O and adsorbed oxygen on the surface of SrTiO3, which produced additional catalytic active centers. Electrons on the 4f energy level for Ce4+ produced new energy states in the band gap of SrTiO3, which not only realized the use of visible light but also led to an easier separation between the photogenerated electrons and holes. Ce4+ repeatedly captured photoelectrons to produce Ce3+, which inhibited the recombination between photogenerated electrons and holes as well as prolonged their lifetime; it also enhanced quantum efficiency for SrTiO3. The methylene blue (MB) degradation efficiency reached 98.7% using 3 mol % Ce4+ doped SrTiO3 as a photocatalyst, indicating highly photocatalytic activity.

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Section: Resultsmentioning

confidence: 99%

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

et al. 2018

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“…9 Several strategies have been proposed to extend its optical absorption edge to the visible (vis) light region, which possesses 43% of the solar energy, through modifying the energy band structure of STO. Doping with foreign atoms, [10][11][12][13][14][15][16][17][18] depositing noble metal, 19 integrating with other materials [20][21][22][23] have been demonstrated to be effective methods to enhance the photocatalytic performance of STO. In the photocatalytic process, the charge carrier recombination occurs within nanoseconds.…”

Section: Introductionmentioning

confidence: 99%

Electronic Structures and Photocatalytic Responses of SrTiO₃(100) Surface Interfaced with Graphene, Reduced Graphene Oxide, and Graphane: Surface Termination Effect

Yang

Huang

et al. 2015

J. Phys. Chem. C

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The enhanced photocatalytic activity of SrTiO 3 (STO), a promising photocatalyst for decomposing organic compounds and overall water splitting for H 2 /O 2 evolution, has been experimentally demonstrated by coupling the graphene(GR) sheet. Here, we reveal the mechanism of the enhanced photocatalytic activity of STO/GR composites using ab initio calculations.Due to C 2p states forming the bottom of conduction band or the top of valence band, the band gap is reduced to about 0.6 eV, resulting into a strong absorption in the visible region. The composites of STO coupled with reduced graphene oxide(RGO) and graphane(GRH) are also explored to investigate their potential photocatalytic activity. We demonstrate that the surface termination layer of STO(100) surface plays an important role in determining the formation energy, interfacial distance, band gap and optical absorption of these composites. Moreover, the GR sheet is a sensitizer for STO with termination layer TiO 2 , on the contrary, it is to be an electron shuttle to carry excited electrons from the STO with termination layer SrO.Interestingly, a type-II, staggered band alignment is formed in the interface, thus improving photoexcited charge separation. The negatively charged O atoms in the RGO are considered to be active sites in photocatalytic reactions, leading to the enhanced photocatalytic activity.The calculated results can rationalize the available experimental reports and provide design principles for optimizing the photocatalytic performance of the STO-based composites.

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“…We attribute these changes to the presence of dodecylamine (DDA) ligands on the particle surface, which can facilitate growth via Ostwald ripening. The increase in the EPR signal from Fe 3+ Zn dopants can only occur from conversion of 19 The FTIR absorption spectra in (B) is presented as the differential absorbance after subtracting the t = 0 spectrum (DAbs). The DAbs values for the IR spectra have been multiplied by a factor of 3 for clarity.…”

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confidence: 99%

Electron trapping on Fe³⁺ sites in photodoped ZnO colloidal nanocrystals

Zhou

Kittilstved

2016

Chem. Commun.

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The effects of photodoping on the electronic structure of Fe(3+)-doped ZnO colloidal nanocrystals are presented. We observe disappearance of the spectroscopic signatures attributed to both substitutional Fe(3+) and interstitial Fe(3+) in the ZnO host as a function of photodoping time, which precede the appearance of the well-known localized surface plasmon resonance from conduction band electrons in ZnO nanocrystals. These results suggest that the oxidation state of Fe(3+) defects can be reversibly switched in ZnO nanocrystals.

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Speciation of Cr(iii) in intermediate phases during the sol–gel processing of Cr-doped SrTiO₃powders

Cited by 19 publications

References 53 publications

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

Electronic Structures and Photocatalytic Responses of SrTiO₃(100) Surface Interfaced with Graphene, Reduced Graphene Oxide, and Graphane: Surface Termination Effect

Electron trapping on Fe³⁺ sites in photodoped ZnO colloidal nanocrystals

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Speciation of Cr(iii) in intermediate phases during the sol–gel processing of Cr-doped SrTiO3powders

Cited by 19 publications

References 53 publications

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

Electronic Structures and Photocatalytic Responses of SrTiO3(100) Surface Interfaced with Graphene, Reduced Graphene Oxide, and Graphane: Surface Termination Effect

Electron trapping on Fe3+ sites in photodoped ZnO colloidal nanocrystals

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Speciation of Cr(iii) in intermediate phases during the sol–gel processing of Cr-doped SrTiO₃powders

Electronic Structures and Photocatalytic Responses of SrTiO₃(100) Surface Interfaced with Graphene, Reduced Graphene Oxide, and Graphane: Surface Termination Effect

Electron trapping on Fe³⁺ sites in photodoped ZnO colloidal nanocrystals