Mixed solvothermal synthesis of hierarchical ZnIn2S4 spheres: specific facet-induced photocatalytic activity enhancement and a DFT elucidation

Wang, Gang; Chen, Gang; Yu, Yaoguang; Zhou, Xin; Teng, Yujie

doi:10.1039/c3ra42245c

Cited by 20 publications

(8 citation statements)

References 51 publications

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“…Furthermore, atomic force microscopy (AFM) measurements in Figure 1F−G and Figure S4 clearly showed that the average thickness of the as-prepared ZnIn 2 S 4 sheets was about 2.46 nm, consisting with the thickness of oneunit-cell ZnIn 2 S 4 slab along the c axis. 25 As a consequence, it was verified that clean and freestanding one-unit-cell ZnIn 2 S 4 layers were first fabricated.…”

Section: ■ Results and Discussionmentioning

confidence: 88%

“…In addition, as revealed by the HAADF-STEM image in Figure A, the 0.33 nm interplanar distances matched well with the d 100 spacings, and the corresponding dihedral angle of 60° agreed well with the calculated angle between (100) and (010) planes of hexagonal ZnIn 2 S 4 , which suggested the [001] orientation of the synthetic two-dimensional ZnIn 2 S 4 sheets, verified by the electron diffraction pattern in Figure E. Furthermore, atomic force microscopy (AFM) measurements in Figure F–G and Figure S4 clearly showed that the average thickness of the as-prepared ZnIn 2 S 4 sheets was about 2.46 nm, consisting with the thickness of one-unit-cell ZnIn 2 S 4 slab along the c axis . As a consequence, it was verified that clean and freestanding one-unit-cell ZnIn 2 S 4 layers were first fabricated.…”

Section: Resultsmentioning

confidence: 90%

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Defect-Mediated Electron–Hole Separation in One-Unit-Cell ZnIn₂S₄ Layers for Boosted Solar-Driven CO₂ Reduction

et al. 2017

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The effect of defects on electron-hole separation is not always clear and is sometimes contradictory. Herein, we initially built clear models of two-dimensional atomic layers with tunable defect concentrations, and hence directly disclose the defect type and distribution at atomic level. As a prototype, defective one-unit-cell ZnInS atomic layers are successfully synthesized for the first time. Aberration-corrected scanning transmission electron microscopy directly manifests their distinct zinc vacancy concentrations, confirmed by positron annihilation spectrometry and electron spin resonance analysis. Density-functional calculations reveal that the presence of zinc vacancies ensures higher charge density and efficient carrier transport, verified by ultrafast photogenerated electron transfer time of ∼15 ps from the conduction band of ZnInS to the trap states. Ultrafast transient absorption spectroscopy manifests the higher zinc vacancy concentration that allows for ∼1.7-fold increase in average recovery lifetime, confirmed by surface photovoltage spectroscopy and PL spectroscopy analysis, which ensures promoted carrier separation rates. As a result, the one-unit-cell ZnInS layers with rich zinc vacancies exhibit a carbon monoxide formation rate of 33.2 μmol g h, roughly 3.6 times higher than that of the one-unit-cell ZnInS layers with poor zinc vacancies, while the former's photocatalytic activity shows negligible loss after 24 h photocatalysis. This present work uncovers the role of defects in affecting electron-hole separation at atomic level, opening new opportunities for achieving highly efficient solar CO reduction performances.

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Section: ■ Results and Discussionmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 90%

Defect-Mediated Electron–Hole Separation in One-Unit-Cell ZnIn₂S₄ Layers for Boosted Solar-Driven CO₂ Reduction

et al. 2017

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“…386 It seems that the promoted separation and suppressed recombination rate of photo-generated electron-hole pairs are responsible for a significant enhancement in the photoactivity due to the Bi doping. In addition, various kinds of hierarchical ZnIn 2 S 4 microspheres 264,265,269,369,[387][388][389] and heterojunctions [374][375][376][390][391][392] were shown to have improved light-absorption and chargeseparation abilities, thus receiving a lot of attention in photocatalytic H 2 evolution. For example, Li et al demonstrated that carbon quantum dots (CQDs) and Pt co-decorated ZnIn 2 S 4 microspheres can be fabricated through a facile microwave hydrothermal method followed by chemical reduction deposition (Fig.…”

Section: Photocatalytic H 2 Generationmentioning

confidence: 99%

Hierarchical photocatalysts

2016

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As a green and sustainable technology, semiconductor-based heterogeneous photocatalysis has received much attention in the last few decades because it has potential to solve both energy and environmental problems. To achieve efficient photocatalysts, various hierarchical semiconductors have been designed and fabricated at the micro/nanometer scale in recent years. This review presents a critical appraisal of fabrication methods, growth mechanisms and applications of advanced hierarchical photocatalysts. Especially, the different synthesis strategies such as two-step templating, in situ template-sacrificial dissolution, self-templating method, in situ template-free assembly, chemically induced self-transformation and post-synthesis treatment are highlighted. Finally, some important applications including photocatalytic degradation of pollutants, photocatalytic H2 production and photocatalytic CO2 reduction are reviewed. A thorough assessment of the progress made in photocatalysis may open new opportunities in designing highly effective hierarchical photocatalysts for advanced applications ranging from thermal catalysis, separation and purification processes to solar cells.

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“…3a shows a typical Cu-Cu 2 O hybrid structure. 28 (Fig. 300 nm) are located on the larger polyhedron (ca.…”

Section: Cu-cu 2 O Truncated Octahedron Prepared By Glucose Reductionmentioning

confidence: 99%

“…3b shows the SAED pattern of the green circle, which demonstrates the typical characteristics of a single-crystal structure. 28,29 The diffraction spots can be indexed to the [001] zone axis of Cu 2 O. The corresponding HRTEM micrograph shows the facets vertical to the [001] zone.…”

Section: Cu-cu 2 O Truncated Octahedron Prepared By Glucose Reductionmentioning

confidence: 99%

Growth of Cu particles on a Cu₂O truncated octahedron: tuning of the Cu content for efficient glucose sensing

Wang

Sun

Ding

et al. 2015

Phys. Chem. Chem. Phys.

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A simple and versatile hydrothermal method is developed to synthesize Cu-Cu2O, in which Cu particles grow on the surface of a Cu2O truncated octahedron. Through the reduction of Cu(2+) by glucose in an alkaline solution, the Cu2O truncated octahedron is quickly formed via a kinetic control process, and then Cu particles selectively nucleate on the high-energy (110) facets of Cu2O, generating a heterostructure. The amount of Cu in the sample is successfully tuned by varying the reaction temperature. Compared to Cu2O, the hybrid Cu-Cu2O architecture shows superior electrocatalytic performance for glucose oxidation due to the synergistic effect between more electrocatalytic active but less conductive Cu2O and more conductive but less electrocatalytic active Cu. By tuning the content of Cu in the heterostructure, the highest electrocatalytic activity is achieved at the Cu/Cu2O molar ratio of 0.83.

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Mixed solvothermal synthesis of hierarchical ZnIn2S4 spheres: specific facet-induced photocatalytic activity enhancement and a DFT elucidation

Cited by 20 publications

References 51 publications

Defect-Mediated Electron–Hole Separation in One-Unit-Cell ZnIn₂S₄ Layers for Boosted Solar-Driven CO₂ Reduction

Defect-Mediated Electron–Hole Separation in One-Unit-Cell ZnIn₂S₄ Layers for Boosted Solar-Driven CO₂ Reduction

Hierarchical photocatalysts

Growth of Cu particles on a Cu₂O truncated octahedron: tuning of the Cu content for efficient glucose sensing

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Mixed solvothermal synthesis of hierarchical ZnIn2S4 spheres: specific facet-induced photocatalytic activity enhancement and a DFT elucidation

Cited by 20 publications

References 51 publications

Defect-Mediated Electron–Hole Separation in One-Unit-Cell ZnIn2S4 Layers for Boosted Solar-Driven CO2 Reduction

Defect-Mediated Electron–Hole Separation in One-Unit-Cell ZnIn2S4 Layers for Boosted Solar-Driven CO2 Reduction

Hierarchical photocatalysts

Growth of Cu particles on a Cu2O truncated octahedron: tuning of the Cu content for efficient glucose sensing

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Product

Resources

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Defect-Mediated Electron–Hole Separation in One-Unit-Cell ZnIn₂S₄ Layers for Boosted Solar-Driven CO₂ Reduction

Defect-Mediated Electron–Hole Separation in One-Unit-Cell ZnIn₂S₄ Layers for Boosted Solar-Driven CO₂ Reduction

Growth of Cu particles on a Cu₂O truncated octahedron: tuning of the Cu content for efficient glucose sensing