Enhanced photocatalytic and photoelectrochemical activities of reduced TiO2−x/BiOCl heterojunctions

Fu, Rongrong; Zeng, Xiaoqiao; Ma, Lu; Gao, Shanmin; Wang, Qingyao; Wang, Zeyan; Huang, Baibiao; Dai, Ying; Lü, Jun

doi:10.1016/j.jpowsour.2016.02.038

Cited by 53 publications

(21 citation statements)

References 59 publications

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“…2b includes two peaks located at 164.5 eV and 159.2 eV that are corresponding to Bi 4 f 5/2 and Bi 4 f 7/2 . The band difference between Bi 4 f 5/2 and Bi 4 f 7/2 is 5.3 eV and the area ratio of both peaks is 4/3, which is in good accordance with the oxidation state of bismuth cations Bi 3+ [25,26]. Correspondingly, two peaks centered at 163.9 eV and 158.6 eV in sample Bi-230°C stay on the relatively low filed in comparison to those in sample Bi-270°C [27,28], probably attributing to the interaction of these species with metallic Bi in sample Bi-230°C at positions of 162.1 eV and 156.7 eV resulted from the electrons migrated from metallic Bi to bismuth oxide [23].…”

Section: Xrd Patterns and Xps Analysessupporting

confidence: 72%

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In situ construction, photocatalytic performance, and mechanism speculation of plasmonic binary Bi/β-Bi2O3 hybrids

Chang

et al. 2018

Materials Science in Semiconductor Processing

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A facile synthetic route was adopted in this study to construct plasmonic binary Bi/β-Bi 2 O 3 hybrids through a solvothermal-incomplete calcination process. As-synthesized samples were systematically characterized by X-ray diffraction patterns, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, and N 2 adsorption-desorption. The calcination temperature exerted an important effect on the surface phase composition variation and binary Bi/β-Bi 2 O 3 hybrids were formed at the suitable temperature with an intimate contact between both components. These hybrids showed enhanced photocatalytic degradation efficiencies over dyes Rhodamine B and methyl orange, mainly attributing to the enlarged specific surface areas, favorable morphology and optical property, and the involvement of semimetal Bi with the surface plasmon resonance effect by means of improved visible-light absorption and efficient charge carries separation. In addition, active species entrapping experiments was eventually conducted for the sake of the possible photocatalysis mechanism speculation.

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Section: Xrd Patterns and Xps Analysessupporting

confidence: 72%

“…In addition, Fig. S2b shows both peaks of O1s at 530.4 eV and 529.3 eV in spectra of sample Bi-230°C and Bi-270°C argon etching with the 7 nm depth, characteristic of oxygen species adsorbed on the surface of sample during samples treatment and lattice oxygen in Bi-O bonds [25].…”

Section: Xrd Patterns and Xps Analysesmentioning

confidence: 98%

In situ construction, photocatalytic performance, and mechanism speculation of plasmonic binary Bi/β-Bi2O3 hybrids

Chang

et al. 2018

Materials Science in Semiconductor Processing

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“…When CoWO 4 nanoparticles were coupled with BiOBr, the exchange of electrons and holes could occur at the two‐phase interface of the composite. The energy band alignment of CoWO 4 and BiOBr brings about the creation of a diffusion potential . When the BiOBr–CoWO 4 nanocomposite is illuminated by visible light, only CoWO 4 nanoparticles can absorb the radiation because the experimental E g value of CoWO 4 nanoparticles is narrower than that of BiOBr particles.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Chowdhury

Shambharkar

2020

Applied Organom Chemis

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Efficient sunlight‐responsive BiOBr–CoWO4 heterostructured nanocomposite photocatalysts were prepared via a chemical precipitation route at 100°C in 4 hours. The prepared BiOBr–CoWO4 heterostructures were characterized for phase identification, chemical composition, surface morphology, optical properties and surface area using various techniques. The X‐ray diffraction pattern of the BiOBr–CoWO4 nanocomposite was composed of diffraction peaks equivalent to both the tetragonal phase of BiOBr and the monoclinic phase of CoWO4 nanoparticles. X‐ray photoelectron spectral study of the BiOBr–CoWO4 nanocomposite revealed orbitals of both BiOBr and CoWO4 compounds. Transmission electron microscopy images revealed that spherical particles of CoWO4 (20–25 nm) were dispersed on the surface of BiOBr. UV–visible–near‐infrared spectral study of the BiOBr–CoWO4 nanocomposite showed good visible‐light absorption. Among the manufactured materials, BiOBr–CoWO4‐2 nanocomposite showed better charge carrier separation efficiency, as demonstrated by photoluminescence and time‐resolved fluorescence. To study the practical utility of the prepared materials, their photocatalytic capability was examined for the degradation of rhodamine B (RhB) aqueous solution under sunlight irradiation. The photodegradation results showed that BiOBr–CoWO4‐2 nanocomposite degraded 98.69% RhB solution and the degradation constant was 0.067 min−1, which was 5.6 and 22.5 times larger than that of pure BiOBr and CoWO4 nanoparticles, respectively, after 60 minutes of sunlight irradiation. The superior photoactivity was facilitated by electron–hole pair separation and transfer driven by the heterostructure interface between BiOBr particles and CoWO4 nanoparticles. The removal of RhB was initiated by photogenerated h+, O2•−and •OH reactive species based on the scavenger effect.

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“…Recently, reducing TiO 2 to create the self-dopants, including O and Ti 3+ defects, becomes interesting for increasing the photocatalytic activity and making use of the visible light. It was also shown that the combination of Ti 3+ self-doped TiO 2 with other materials, such as BiOCl, can effectively increase the photocatalytic activity …”

Section: Introductionmentioning

confidence: 99%

Ice–Water Quenching Induced Ti³⁺ Self-doped TiO₂ with Surface Lattice Distortion and the Increased Photocatalytic Activity

Liu

Cheng²,

Nie

et al. 2017

J. Phys. Chem. C

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The present research reported a facile strategy to prepare Ti 3+ self-doped TiO 2 with increased photocatalytic activity. The TiO 2 subjected to high temperature preannealing was directly thrown into ice−water for rapid quenching. It is interesting to see that the quenched samples show pale blue color due to the absorption in visible and near-IR region. The comprehensive analyses of X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, field-emission scanning electron microscope, and Brunauer−Emmett−Teller (BET) show that the crystallinity, the morphologies, and the specific surface area are almost unchanged after the ice−water quenching. The spectroscopic analyses of UV−vis diffusion reflectance spectra, photoluminescence spectra, and X-ray photoelectron spectra clearly show the change of electronic structure of TiO 2 due to presence of Ti 3+ ions induced by the ice−water quenching, which is further confirmed by the electron paramagnetic resonance analysis. No Ti 3+ ions are generated if the preannealing temperature is below 800 °C. The energy band structure model involving the Ti 3+ ions and the associated oxygen defects was proposed to explain the change of UV−vis diffusion absorption. It is considered that the high concentration of oxygen defects at high preannealing temperatures can be partially frozen by the ice−water quenching, which then can denote the high concentration of excess electrons. Some excess electrons can be localized at Ti lattice sites, resulting in the presence of Ti 3+ ions. More interestingly, it is also seen that the rapid ice−water quenching causes the distortion of surface lattice due to the interaction between hot TiO 2 and water, which tends to be poly crystalline and disordered for high preannealing temperature. The surface lattice distortion is considered to be correlated with the generation of oxygen defects during the ice−water quenching. The quenched samples show obviously increased photocatalytic activity for both methylene blue degradation and hydrogen evolution under UV light illumination. Although they do not have visible activity, loading amorphous Cu(OH) x nanoclusters can greatly increase their ability to degrade methylene blue under visible light illumination. It is also shown that the photocatalytic activity of ZnO can also be increased to some extent by the ice−water quenching. Therefore, the ice−water quenching could be a general method for increasing the photocatalytic activity of many materials.

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Enhanced photocatalytic and photoelectrochemical activities of reduced TiO2−x/BiOCl heterojunctions

Cited by 53 publications

References 59 publications

In situ construction, photocatalytic performance, and mechanism speculation of plasmonic binary Bi/β-Bi2O3 hybrids

In situ construction, photocatalytic performance, and mechanism speculation of plasmonic binary Bi/β-Bi2O3 hybrids

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Ice–Water Quenching Induced Ti³⁺ Self-doped TiO₂ with Surface Lattice Distortion and the Increased Photocatalytic Activity

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Enhanced photocatalytic and photoelectrochemical activities of reduced TiO2−x/BiOCl heterojunctions

Cited by 53 publications

References 59 publications

In situ construction, photocatalytic performance, and mechanism speculation of plasmonic binary Bi/β-Bi2O3 hybrids

In situ construction, photocatalytic performance, and mechanism speculation of plasmonic binary Bi/β-Bi2O3 hybrids

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO4 heterostructured nanocomposites

Ice–Water Quenching Induced Ti3+ Self-doped TiO2 with Surface Lattice Distortion and the Increased Photocatalytic Activity

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Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Ice–Water Quenching Induced Ti³⁺ Self-doped TiO₂ with Surface Lattice Distortion and the Increased Photocatalytic Activity