Next Article in Journal
Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye
Next Article in Special Issue
Optimization of Photocatalytic Degradation of Acid Blue 113 and Acid Red 88 Textile Dyes in a UV-C/TiO2 Suspension System: Application of Response Surface Methodology (RSM)
Previous Article in Journal
Epoxidation of Karanja (Millettia pinnata) Oil Methyl Esters in the Presence of Hydrogen Peroxide over a Simple Niobium-Containing Catalyst
Previous Article in Special Issue
Hydrogen Production from Glycerol Photoreforming on TiO2/HKUST-1 Composites: Effect of Preparation Method
Article Menu
Issue 4 (April) cover image

Export Article

Open AccessArticle

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

1
School of Materials Science and Technology, University of Shanghai for Science and Technology, Shanghai 200093, China
2
Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
3
College of Materials Science and Engineering, Central South University, Changsha 410083, China
4
College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
5
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; https://doi.org/10.3390/catal9040345
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)
  |  
PDF [3103 KB, uploaded 23 April 2019]
  |  

Abstract

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
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Supplementary material

SciFeed

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Catalysts EISSN 2073-4344 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top