NDLI: A high-performance Bi2WO6–graphene photocatalyst for visible light-induced H2 and O2 generation

Content Provider	Royal Society of Chemistry (RSC)
Author	Guo, Jingjing Sun, Zhihua Ma, Jun Mao, Lin Zhu, Shenmin Zhang, Di
Copyright Year	2014
Abstract	We developed a highly efficient photocatalyst for both H2 and O2 generation under visible-light irradiation by attaching Bi2WO6 (BWO) nanocrystals on graphene nanosheets to produce a graphene–Bi2WO6 composite (Gr–BWO-T). The composite was prepared by a sonochemical method where graphene oxide (GO) served as the support on which BWO formed in situ. Bi2WO6 nanoparticles with the size of 30–40 nm were homogeneously dispersed on the surface of graphene sheets, due to their bonding with graphene. When used as a photocatalyst under visible-light irradiation, O2 production rate reached a value up to 20.60 μmol h−1, 4.18 times higher than that of bare BWO, resulting from the strong covalent bonding between graphene and BWO nanoparticles. The chemical bonding facilitated the electron collection and transportation and inhibited the recombination of photo-generated charge carriers, even in this system with a large amount of graphene inside (40 wt%). More interestingly, H2-production by Gr–BWO-T was also observed to be as high as 159.20 μmol h−1. This could be ascribed to the existence of the graphene that led to decrease in conduction band potential and resulted in a more negative reduction potential than H+/H2. This facile sonochemical approach provides a new strategy for engineering ternary compound nanoparticles on graphene sheets, with great potential application in energy conversion.
Starting Page	2186
Ending Page	2193
Page Count	8
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	6
Issue Number	4
Journal	Nanoscale
DOI	10.1039/c3nr05249d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Oxygen Graphene Hydrogen Photocatalysis Carrier generation and recombination Covalent bond Valence and conduction bands BWO (band)
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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