AgBr tetradecahedrons with co-exposed {100} and {111} facets: simple fabrication and enhancing spatial charge separation using facet heterojunctions

Bao, Shenyuan; Wang, Zhiqiang; Gong, Xue‐Qing; Zeng, Cuiyun; Wu, Qiangfang; Tian, Baozhu; Zhang, Jinlong

doi:10.1039/c6ta06594e

Cited by 36 publications

(25 citation statements)

References 50 publications

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“…The flat band potentials ( E fb ) of the samples can be estimated using the extrapolation of the Mott-Schottky plot at the frequency of 1000 Hz and found to be − 0.685 eV for the SnNb 2 O 6 , − 0.67 eV for the mixed phases of SnNb 2 O 6 and Sn 2 Nb 2 O 7 , and − 0.626 eV for the Sn 2 Nb 2 O 7 . It was known that the conduction band potentials of n-type semiconductors were closed to the flat potential [39, 79, 80]. Hence, the positions the conduction band of the prepared samples were − 0.685, − 0.67, and − 0.626 eV for SnNb 2 O 6 , the mixed phases of SnNb 2 O 6 and Sn 2 Nb 2 O 7 , and the Sn 2 Nb 2 O 7 , respectively (inset of Additional file 1: Figure S6).…”

Section: Resultsmentioning

confidence: 99%

Steering Charge Kinetics of Tin Niobate Photocatalysts: Key Roles of Phase Structure and Electronic Structure

et al. 2018

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Tin niobate photocatalysts with the phase structures of froodite (SnNb2O6) and pyrochlore (Sn2Nb2O7) were obtained by a facile solvothermal method in order to explore the impact of phase structure and electronic structure on the charge kinetics and photocatalytic performance. By employing tin niobate as a model compound, the effects of phase structure over electronic structure, photocatalytic activity toward methyl orange solution and hydrogen evolution were systematically investigated. It is found that the variation of phase structure from SnNb2O6 to Sn2Nb2O7 accompanied with modulation of particle size and band edge potentials that has great consequences on photocatalytic performance. In combination with the electrochemical impedance spectroscopy (EIS), transient photocurrent responses, transient absorption spectroscopy (TAS), and the analysis of the charge-carrier dynamics suggested that variation of electronic structure has great impacts on the charge separation and transfer rate of tin niobate photocatalysts and the subsequent photocatalytic performance. Moreover, the results of the X-ray photoelectron spectroscopy (XPS) indicated that the existent of Sn4+ species in Sn2Nb2O7 could result in a decrease in photocatalytic activity. Photocatalytic test demonstrated that the SnNb2O6 (froodite) catalyst possesses a higher photocatalytic activity toward MO degradation and H2 evolution compared with the sample of Sn2Nb2O7 (pyrochlore). On the basis of spin resonance measurement and trapping experiment, it is expected that photogenerated holes, O2−•, and OH• active species dominate the photodegradation of methyl orange.Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2578-2) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Steering Charge Kinetics of Tin Niobate Photocatalysts: Key Roles of Phase Structure and Electronic Structure

et al. 2018

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“…Over the past decade, semiconductor photocatalyst has played a pivotal role in the fields of solar energy harvesting, clean chemical synthesis, photocatalytic antibacterial agents, and environmental technology due to its advantages over conventional heat‐driven catalysis, which generally depend on high thermal energy that results in low product selectivity . Among the semiconductors reported to date, silver halides, AgX; (X=Cl, Br and I) are a family of materials, which display a wide range of applications as antimicrobial agents, catalysts for water oxidation, and photocatalysts for environmental remediation …”

Section: Introductionmentioning

confidence: 99%

Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects

et al. 2020

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Periodic structures induced by electron irradiation are a unique phenomenon when electron beams irradiate on the surface of some materials. These periodic structures have potential for technological applications. However, the fuzzy nature of the electron-induced structuring hinders its further exploration in such applications. In this paper, novel Ag nanoparticle/AgX (X=Cl, Br and I) composites, with enhanced photocatalytic activity and low toxicological effects, were prepared, for the first time, using electron beam irradiation. The remarkable advantage of this approach is that the Ag nanoparticles/AgX composites can be easily prepared in one-step without the need for high-pressure conditions, surfactants, ionic liquids, or reducing agents. Furthermore, our method does not involve any toxic substances, which makes the as-synthesized samples highly applicable for technological applications. The structure, morphology and physicochemical properties of the Ag nanoparticles/AgX composites were studied using various characterization techniques. Using first-principles calculations based on density functional theory and the quantum theory of atoms in molecules, we reveal how the concentration of excess electrons in the AgX materials induces the formation of the Ag nanoparticles under electron beam irradiation. These results extend the fundamental understanding of the atomic process underlying the mechanism of AgÀ X bond rupture observed during the transformation induced via electron irradiation of the AgX crystals by increasing the total number of electrons in the bulk structure. Thus, our findings provide viable guidance for the realization of new materials for the degradation of contaminated wastewater with low toxicity.

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“…This means that redox reactions occur locally at the separate planes, resulting in spatial charge separation in semiconductors. For example, multi-morphologic silver bromide (AgBr) crystals containing distinct exposed planes were prepared by synchronously injecting silver nitrate and potassium bromide precursors [74] . The shape and exposed planes of the target sample could be easily modulated by varying the density of Br − ions, which can significantly reduce the surface barrier of (1 0 0) and (1 1 1) planes and affect their growth rates.…”

Section: Strategies For Photocatalytic Activity Improvementmentioning

confidence: 99%

Recent advances in photodegradation of antibiotic residues in water

Yang

Chen

Zhao

et al. 2021

Chemical Engineering Journal

320

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AgBr tetradecahedrons with co-exposed {100} and {111} facets: simple fabrication and enhancing spatial charge separation using facet heterojunctions

Abstract: The solar energy conversion efficiency of semiconductor materials is closely related to the separation rate of photogenerated charge carriers.

Cited by 36 publications

References 50 publications

Steering Charge Kinetics of Tin Niobate Photocatalysts: Key Roles of Phase Structure and Electronic Structure

Steering Charge Kinetics of Tin Niobate Photocatalysts: Key Roles of Phase Structure and Electronic Structure

Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects

Recent advances in photodegradation of antibiotic residues in water

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