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489 results on '"Zhengquan Li"'

64. Enhancing photocatalytic CO2 reduction via a single-domain ferroelectric Z-scheme heterojunction of BiFeO3/CsPbBr3 inducing dual built-in electric fields.

Author

Danrui Pan, Yi Lu, Idris, Ahmed Mahmoud, Zhihao Chen, Leyi Xu, Jin Wang, Guocan Jiang, Zhaojiang Chen, and Zhengquan Li

Abstract

Utilizing the inherent spontaneous polarization of single-domain ferroelectric materials is crucial for achieving spatial charge separation via the induction of a built-in electric field. Herein, a single-domain Z-scheme heterojunction of BiFeO3/CsPbBr3 was rationally designed by in situ growth of CsPbBr3 nanocrystals on the surface of single-domain BiFeO3 nanosheets. Detailed experimental characterization and theoretical simulations reveal that forming the single-domain BiFeO3/CsPbBr3 heterojunction induces a polarization electric field within the BiFeO3 and a built-in-electric field at the heterojunction interface, both of which act as dual driving forces (DDFs) for charge separation. Under light irradiation, the DDFs enable significant spatial charge separation within the heterojunction following a Z-scheme charge transfer mode. Consequently, the single-domain BiFeO3/CsPbBr3 heterojunction yields a sound photocatalytic CO production rate of 53.1 mmol g-1 h-1 in a solid-vapor reaction system under visible light irradiation, representing a 6.4-fold increase in activity compared to pristine CsPbBr3. This work demonstrates the significant impact of developing single-domain heterojunction photocatalysts to enhance visible light-driven photocatalytic systems. [ABSTRACT FROM AUTHOR]

Published
2024
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82. A new 0D–2D CsPbBr3–Co3O4 heterostructure photocatalyst with efficient charge separation for photocatalytic CO2 reduction

Author

Xin Zhong, Xinmeng Liang, Xinyu Lin, Jin Wang, Malik Zeeshan Shahid, and Zhengquan Li

Subjects
Inorganic Chemistry
Abstract

CsPbBr3 quantum dots were precisely incorporated in Co3O4 hexagonal platelets to construct a new CsPbBr3–Co3O4 heterostructure, which exhibited efficient charge separation to achieve an improved photocatalytic reduction of CO2 into CO and CH4.

Published
2023
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99. Self-Supported Three-Dimensional Quantum Dot Aerogels as a Promising Photocatalyst for CO2 Reduction

Author

Guocan Jiang, Jin Wang, Nuoya Li, René Hübner, Maximilian Georgi, Bin Cai, Zhengquan Li, Vladimir Lesnyak, Nikolai Gaponik, and Alexander Eychmüller

Subjects
General Chemical Engineering, Materials Chemistry, General Chemistry
Abstract

With the merits of quantum dots (QDs) (e.g., high molar extinction coefficient, strong visible light absorption, large specific surface area, and abundant functional surface active sites) and aerogels (e.g., self-supported architectures, porous network), semiconductor QD aerogels show great prospect in photocatalytic applications. However, typical gelation methods rely on oxidative treatments of QDs. Moreover, the remaining organic ligands (e.g., mercaptoacids) are still present on the surface of gels. Both these factors inhibit the activity of such photocatalysts, hampering their widespread use. Herein, we present a facile 3D assembly of II−VI semiconductor QDs capped with inorganic (NH4)2S ligands into aerogels using H2O as a dispersion solvent. Without any sacrificial agents, the resulting CdSe QD aerogels achieve a high CO generation rate of 15 μmol g-1 h-1, which is 12-fold higher than that of pristine-aggregated QD powders. Our work not only provides a facile strategy to fabricate QD aerogels but also offers a platform for designing advanced aerogel-based photocatalysts.

Published
2022
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