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Self-assembled Ag_(4)V_(2)O_(7)/Ag_(3)VO_(4) z-scheme heterojunction by pH adjustment with efficient photocatalytic performance

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Journal of Advanced Ceramics 2022年第11期11卷 1789-1800页

作者： Yan XING Xichuan LU Yi LI Bozhi YANG Yujia HUANG Mengfei zHANG Jing CHENG Xin MIN Wei PAN New Energy Technology Engineering Lab of Jiangsu Province College of ScienceNanjing University of Posts and TelecommunicationsNanjing 210023China State Key Laboratory of New Ceramics&Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of Geosciences(Beijing)Beijing 100083China School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000China

Semiconductor heterojunction plays a pivotal role in ***,the construction of a heterojunction with a fine microstructure usually requires complex synthetic ***,a pH-adjusted one-step method was employed to controllably synthesize Ag_(4)V_(2)O_(7)/Ag_(3)VO_(4) heterojunction with a well-tuned 0D/1D hierarchical structure for the first *** is noteworthy that the ordered stacking of vanadium oxide tetrahedron(VO_(3)-)guided by the pH value wisely realizes the in-situ growth of Ag_(4)V_(2)O_(7) nanoparticles on the surface of Ag_(3)VO_(4) ***,comprehensive characterization and calculation decipher the electronic structures of Ag_(4)V_(2)O_(7) and Ag_(3)VO_(4) and the formation of z-scheme heterojunction,benefiting the visible light harvesting and carrier *** a new Ag_(4)V_(2)O_(7)/Ag_(3)VO_(4) heterojunction exhibits remarkable photocatalytic activity and excellent *** degradation of Rhodamine B(RhB)can be achieved in 10 min by the Ag_(4)V_(2)O_(7)/Ag_(3)VO_(4) heterojunction under visible light irradiation,demonstrating an outstanding reaction rate of 0.35 min^(−1) that is up to 84-fold higher than those of other silver *** importantly,this integration of synthesis technology and heterojunction design,based on the intrinsic crystal and electronic structures,could be inspiring for developing novel heterostructured materials with advanced performance.

关键词： Ag_(4)V_(2)O_(7)/Ag_(3)VO_(4) self-assembly heterojunction z scheme photocatalysis

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Efficient Photocatalytic CO2 Reduction over WO3 Nanoflakes supported Octahedral Cu2O Heterostructure

Efficient Photocatalytic CO2 Reduction over WO3 Nanoflakes s...

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中国化学会第二届全国光功能材料青年学者研讨会

作者： Ji-Chao Wang Weina Shi College of Chemistry and Chemical Engineering Henan Institute of Science and Technology College of Chemistry and Chemical Engineering Xinxiang University

Hexagonal-phase WO3 nanosheet with dominant facets was synthesized by a solvothermal-calcination method, and CuO was composite and the electrodeposition method. The Cu O/WO-001 composite nanosheets exhibited an excellent photocatalytic CO reduction performance under visible irradiation(λ > 400 nm). The yields of CO, O and H using Cu O/WO-001 photocatalysts reached 11.7, 5.7 and 0.7 μmol, respectively, after24 h visible-light illumination and the photocatalyst showed good photocatalytic activity in the fourth cycling *** enhanced photocatalytic activity was ascribed to the efficient separation of the photoinduced charges derived from the constructed heterojunction in the nanosheet composite. The(0 0 1) facet of hexagonal phase WO was in favor of the transfer between the photo-induced holes and the water molecules, conducing to H O oxidation in the CO reduction process. The indirect z-scheme charge transfer mode of Cu O/WO was then demonstrated by measuring band structures and the potential mechanism of CO reduction is further proposed. The present research is expected to be useful in developing z-scheme photocatalysts of WO-based nanosheet, and provides meaningful information for hopefully stimulating more insightful investigations of systematical design and controlled assembly of visible-light-driven photocatalysts.

关键词： Cu2O z scheme CO2 reduction Photocatalysis

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