Cascaded electron transition in CuWO_4/CdS/CDs heterostructure accelerating charge separation towards enhanced photocatalytic activity |
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| Institution: | 1. PPGQ-DQ-Universidade Federal do Piauí, Teresina, PI, CEP – 64049550 Brazil;2. PPGQ-GERATEC-DQ-Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, 64002-150, Teresina, PI, Brazil;1. College of Science, Civil Aviation University of China, Tianjin 300300, China;2. School of Materials Science and Engineering & Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, 300384 Tianjin, China;3. Key Laboratory for Photonic and Electric Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin 150025, China |
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| Abstract: | CuWO_4,as an n-type oxide semiconductor with a bandgap of 2.2 eV,has stimulated enormous interest as a potential broad-spectrum-active photocatalyst for environmental pollution remediations.However,rapid charge recombination greatly hinders its practical applications.Herein,we present a cascaded electron transition pathway in a ternary heterostructure consisting of CdS quantum dots,carbon dots(CDs) and CuWO_4 hollow spheres,which proves to greatly facilitate the photogenerated electron-hole separation,and eventually boosts the degradation efficiency of phenol and congo red by 100% and 46%compared to bare CuWO_4.The enhanced performance of the CuWO_4/CdS/CDs heterostructure mainly originates from the unidirectional electron migration from CdS to CuWO_4 and then to the organics through CDs.This work elucidates the electron transfer kinetics in multi-phase system and provides a new design paradigm for optimizing the properties of CuWO_4 based photocatalysts. |
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| Keywords: | Cascaded electron transition Hollow spheres Carbon dots Photocatalysis |
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