期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 38, 期 28, 页码 12266-12272出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2013.07.039
关键词
Inverse structure; Graphene quantum dots; Water splitting; TiO2 nanotubes-array
资金
- National Natural Science Foundation of China [21076146, 21276184]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120032110014]
- Program of New Century Excellent Talents in University of China [NCET-07-0599]
- Program of Introducing Talents of Discipline [B06006]
The inversely structured TiO2 nanotubes-array (TiO2-NA) and CdS-modified TiO2 nanotubes-array (CdS/TiO2-NA) with graphene quantum dots (GQDs) anchored inside were prepared through a facile impregnation method. The catalysts were characterized by multiple techniques of SEM, TEM, XRD, Raman spectroscopy, XPS, TG and diffuse reflectance UV/Vis absorption spectroscopy. The results of TEM, XPS and Raman spectroscopy indicate that the GQDs were really formed and successfully anchored into the TiO2-NA and CdS/TiO2-NA. The activity evaluation results show that the hydrogen evolution rate during photocatalytic water splitting was greatly improved after loading GQDs into TiO2-NA and CdS/TiO2-NA. By breaking graphene into GQDs, the light-filtering effect of graphene was remarkably inhibited as compared with that of conventional large graphene sheets. Moreover, the overall morphology of TiO2 nanotube array could be well maintained after anchoring GQDs inside, which is favorable to mass transfer. The catalyst design strategy proposed in present work can be extended to other photocatalytic systems. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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