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Facet-Dependent Interfacial Charge Transfer in TiO2/Nitrogen-Doped Graphene Quantum Dots Heterojunctions for Visible-Light Driven Photocatalysis

School of Materials Science and Technology, University of Shanghai for Science and Technology, Shanghai 200093, China
Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
College of Materials Science and Engineering, Central South University, Changsha 410083, China
College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
Shanghai Innovation Institute for Materials, Shanghai 200444, China
Authors to whom correspondence should be addressed.
These two authors contributed equally to this work.
Catalysts 2019, 9(4), 345;
Received: 26 February 2019 / Revised: 3 April 2019 / Accepted: 8 April 2019 / Published: 9 April 2019
(This article belongs to the Special Issue Emerging Trends in TiO2 Photocatalysis and Applications)
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Interfacial charge transfer is crucial in the efficient conversion of solar energy into fuels and electricity. In this paper, heterojunction composites were fabricated, comprised of anatase TiO2 with different percentages of exposed {101} and {001} facets and nitrogen-doped quantum dots (NGQDs) to enhance the transfer efficiency of photo-excited charge carriers. The photocatalytic performances of all samples were evaluated for RhB degradation under visible light irradiation, and the hybrid containing TiO2 with 56% {001} facets demonstrated the best photocatalytic activity. The excellent photoactivity of TiO2/NGQDs was owed to the synergistic effects of the following factors: (i) The unique chemical features of NGQDs endowed NGQDs with high electronic conductivities and provided its direct contact with the TiO2 surface via forming Ti–O–C chemical bonds. (ii) The co-exposed {101} and {001} facets were beneficial for the separation and transfer of charge carriers in anatase TiO2. (iii) The donor-acceptor interaction between NGQDs and electron-rich {101} facets of TiO2 could remarkably enhance the photocurrent, thus hindering the charge carriers recombination rate. Extensive characterization of their physiochemical properties further showed the synergistic effect of facet-manipulated electron-hole separation in TiO2 and donor-acceptor interaction in graphene quantum dots (GQDs)/TiO2 on photocatalytic activity. View Full-Text
Keywords: electron transfer; graphene quantum dots; heterojunction; photocatalysis; TiO2 electron transfer; graphene quantum dots; heterojunction; photocatalysis; TiO2

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Ou, N.-Q.; Li, H.-J.; Lyu, B.-W.; Gui, B.-J.; Sun, X.; Qian, D.-J.; Jia, Y.; Wang, X.; Yang, J. Facet-Dependent Interfacial Charge Transfer in TiO2/Nitrogen-Doped Graphene Quantum Dots Heterojunctions for Visible-Light Driven Photocatalysis. Catalysts 2019, 9, 345.

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