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106 results on '"Sun, Bojing"'

20. Construction of plasmonic 1T-WS2/2H-WS2/CdS heterostructures for enhanced solar driven hydrogen evolution.

Author

Chen, Xiaoyu, Han, Zhi, Zhang, Bin, Sun, Bojing, Wang, Yu, Du, Yunchen, Han, Xijiang, and Xu, Ping

Abstract

Localized surface plasmon resonance (LSPR) has been approved as a distinguished approach to improving the light absorption and carrier migration of photocatalysts. Herein, taking advantage of the LSPR effect of WS2 nanosheets, 1T-WS2/2H-WS2/CdS heterostructures have been constructed for hydrogen production through photocatalytic water splitting. Such heterostructures have strong light absorption ability and excellent photocorrosion resistance. Finite difference time domain (FDTD) simulations demonstrate that the LSPR effect of WS2 nanosheets can improve the photocatalytic performance of 1T-WS2/2H-WS2/CdS heterostructures through photothermal assistance as well as generated hot electrons, and the maximum hydrogen evolution rate of the heterostructures can be further raised to 4.67 mmol g−1 h−1. Significantly, the performance can remain stable in 20 h reaction cycles. This work provides new insight into the design of plasmonic photocatalysts for solar-driven hydrogen evolution. [ABSTRACT FROM AUTHOR]

Published
2022
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30. Oxygen Vacancy-Induced Construction of CoO/h-TiO2Z-Scheme Heterostructures for Enhanced Photocatalytic Hydrogen Evolution

Author

Chen, Xiaoyu, Sun, Bojing, Chu, Jiayu, Han, Zhi, Wang, Yu, Du, Yunchen, Han, Xijiang, and Xu, Ping

Abstract

Environmentally friendly catalysts with excellent performance and low cost are critical for photocatalysis. Herein, using hydrogenated TiO2(h-TiO2) nanosheets with enriched oxygen vacancies as the support, two-dimensional CoO/h-TiO2Z-scheme heterostructures are fabricated for hydrogen production through photocatalytic water splitting. It is revealed that the oxygen vacancies in h-TiO2can inhibit the oxidation of Co2+into high-valence Co3+during the hydrothermal reaction and thermal treatment processes. A CoO/h-TiO2Z-scheme heterostructure possesses a space charge region and a built-in electric field at the interface, and oxygen vacancies in h-TiO2can provide more reactive sites, which synergistically improve the separation and transportation of photogenerated carriers. As a result, the photocatalytic hydrogen evolution rate achieves 129.75 μmol·h–1(with 50 mg of photocatalysts) on the optimized CoO/h-TiO2heterostructures. This work provides a new design idea for the preparation of excellent TiO2-based photocatalysts.

Published
2022
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42. O, S-Dual-Vacancy Defects Mediated Efficient Charge Separation in ZnIn2S4/Black TiO2Heterojunction Hollow Spheres for Boosting Photocatalytic Hydrogen Production

Author

Sun, Bojing, Bu, Jiaqi, Du, Yunchen, Chen, Xiaoyu, Li, Zhenzi, and Zhou, Wei

Abstract

Defective ZnIn2S4nanosheets/mesoporous black TiO2heterojunction hollow spheres (H-ZIS/b-TiO2) are prepared through hydrothermal and surface low-temperature hydrogenation strategies, which show broad-spectrum response and excellent charge separation efficiency. This H-ZIS/b-TiO2flower-like heterojunction hollow spheres with a narrow band gap of ∼1.88 eV expand the light response to visible light and show excellent photocatalytic hydrogen evolution rate (278 μmol h–150 mg–1) under visible-light irradiation, which is 1.5 times as high as that of ZnIn2S4/black TiO2heterojunction hollow spheres (ZIS/b-TiO2) (181 μmol h–150 mg–1). The excellent photocatalytic performance is due to the formation of O, S dual vacancies in b-TiO2and H-ZIS providing more active sites for photocatalytic reaction and improving the charge separation efficiency, heterojunctions promoting transport of photogenerated carriers, and the hollow structure increasing light utilization by reflecting light. The novel heterojunction hollow sphere with high performance has broad application prospects in the field of energy.

Published
2021
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48. Facile Synthesis of Yolk–Shell Mn3O4Microspheres as a High-Performance Peroxymonosulfate Activator for Bisphenol A Degradation

Author

Zhang, Leijiang, Tong, Tianze, Wang, Na, Ma, Wenjie, Sun, Bojing, Chu, Jiayu, Lin, Kunyi Andrew, and Du, Yunchen

Abstract

Manganese-based materials have been regarded as a kind of widely used heterogeneous catalysts for peroxymonosulfate (PMS) activation in water remediation. In this work, yolk–shell Mn3O4(YS-Mn3O4) microspheres with a porous structure were synthesized by a simple hydrothermal method with manganese glycerate (Mn-GL) as a self-sacrificing template. YS-Mn3O4exhibits high Brunauer–Emmett–Teller surface area (81.0 m2/g) and pore volume (0.18 cm3/g), which are essentially favorable for the development of its catalytic activity. When YS-Mn3O4is employed as a PMS activator, it can exhibit good performance in the degradation of bisphenol A (BPA). Some influential parameters, such as catalyst dosage, oxone concentration, reaction temperature, BPA concentration, and pH value, and some inorganic ions have been analyzed in detail. Electron paramagnetic resonance examination and radical quenching results demonstrate that •OH and •SO4–should be responsible for the rapid decomposition of BPA in the YS-Mn3O4/PMS system. This work will be significant for tailoring the morphology of materials and arousing more attention to enhance the stability and reusability of catalysts.

Published
2019
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