In-situ construction of 2D direct Z-scheme g-C3N4/g-C3N4 homojunction with high photocatalytic activity

Constructing all-solid-state Z-scheme junction is a very effective strategy to design highly active photocatalysts for solar energy conversion and environmental purification. We herein firstly construct 2D g-C 3 N 4 /g-C 3 N 4 Z-scheme homojunction by using a bottom-up approach, during which the sup...

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Veröffentlicht in:Journal of materials science 2018-12, Vol.53 (23), p.15882-15894
Hauptverfasser: Qiao, Qing, Huang, Wei-Qing, Li, Yuan-Yuan, Li, Bo, Hu, Wangyu, Peng, Wei, Fan, Xiaoxing, Huang, Gui-Fang
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container_end_page 15894
container_issue 23
container_start_page 15882
container_title Journal of materials science
container_volume 53
creator Qiao, Qing
Huang, Wei-Qing
Li, Yuan-Yuan
Li, Bo
Hu, Wangyu
Peng, Wei
Fan, Xiaoxing
Huang, Gui-Fang
description Constructing all-solid-state Z-scheme junction is a very effective strategy to design highly active photocatalysts for solar energy conversion and environmental purification. We herein firstly construct 2D g-C 3 N 4 /g-C 3 N 4 Z-scheme homojunction by using a bottom-up approach, during which the supramolecular complex is initially formed, followed by a facile thermal polycondensation. Based on the active species trapping experiments, Mott–Schottky test and band edge position analysis, the prepared 2D nanosheet g-C 3 N 4 /g-C 3 N 4 homojunctions are found to be Z-scheme type, different from those available reported ones with a type-II energy alignment. Benefiting from the specific 2D morphology with large exposed surface area and Z-scheme junction with efficient separation and high redox abilities of the photoinduced electrons and holes, the obtained 2D g-C 3 N 4 /g-C 3 N 4 homojunctions are much more active than the conventional g-C 3 N 4 /g-C 3 N 4 homojunction (CN-MT) and bulk g-C 3 N 4 (CN-M) under visible light irradiation, validating by the high rhodamine degradation rate of 0.833 h − 1 , which is about 3.9 and 15.4 times higher than that of CN-MT (0.214 h − 1 ) and CN-M (0.054 h − 1 ), respectively. The present work sheds light on design of novel Z-scheme photocatalysts with specific morphology and thus further application in the field of environment or energy.
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We herein firstly construct 2D g-C 3 N 4 /g-C 3 N 4 Z-scheme homojunction by using a bottom-up approach, during which the supramolecular complex is initially formed, followed by a facile thermal polycondensation. Based on the active species trapping experiments, Mott–Schottky test and band edge position analysis, the prepared 2D nanosheet g-C 3 N 4 /g-C 3 N 4 homojunctions are found to be Z-scheme type, different from those available reported ones with a type-II energy alignment. Benefiting from the specific 2D morphology with large exposed surface area and Z-scheme junction with efficient separation and high redox abilities of the photoinduced electrons and holes, the obtained 2D g-C 3 N 4 /g-C 3 N 4 homojunctions are much more active than the conventional g-C 3 N 4 /g-C 3 N 4 homojunction (CN-MT) and bulk g-C 3 N 4 (CN-M) under visible light irradiation, validating by the high rhodamine degradation rate of 0.833 h − 1 , which is about 3.9 and 15.4 times higher than that of CN-MT (0.214 h − 1 ) and CN-M (0.054 h − 1 ), respectively. 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Benefiting from the specific 2D morphology with large exposed surface area and Z-scheme junction with efficient separation and high redox abilities of the photoinduced electrons and holes, the obtained 2D g-C 3 N 4 /g-C 3 N 4 homojunctions are much more active than the conventional g-C 3 N 4 /g-C 3 N 4 homojunction (CN-MT) and bulk g-C 3 N 4 (CN-M) under visible light irradiation, validating by the high rhodamine degradation rate of 0.833 h − 1 , which is about 3.9 and 15.4 times higher than that of CN-MT (0.214 h − 1 ) and CN-M (0.054 h − 1 ), respectively. 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subjects Carbon nitride
Catalytic activity
Characterization and Evaluation of Materials
Chemical Routes to Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Homojunctions
Light irradiation
Materials Science
Morphology
Photocatalysis
Photocatalysts
Polymer Sciences
Rhodamine
Solar energy conversion
Solid Mechanics
Two dimensional analysis
title In-situ construction of 2D direct Z-scheme g-C3N4/g-C3N4 homojunction with high photocatalytic activity
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