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

Nanoscale
Zhihua SunDi Zhang

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 sonochem...Continue Reading

References

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Citations

Jun 17, 2015·Angewandte Chemie·Quanjun XiangJiaguo Yu
Nov 22, 2014·Chemical Communications : Chem Comm·Yan-Jie WangBaizeng Fang
May 10, 2016·Physical Chemistry Chemical Physics : PCCP·Fengzhu RenWenzhi Yao
Nov 12, 2019·Frontiers in Chemistry·Noureen SyedLiyun Cao
May 28, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Saibo ChenKun Wang
Jul 16, 2021·Chemistry : a European Journal·Giovanni Di LibertoGianfranco Pacchioni
Apr 3, 2020·ACS Applied Materials & Interfaces·Sujuan WuMatthew F Chisholm

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