Size-constrained ultrathin BiOCl nanosheets@C composites with enhanced photocatalytic and photoelectrochemical performan
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RESEARCH ARTICLE
Size-constrained ultrathin BiOCl nanosheets@C composites with enhanced photocatalytic and photoelectrochemical performance Yugui WANG, Yajun JI (✉), and Qizhi TIAN College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China
© Higher Education Press 2020
ABSTRACT: Size-constrained ultrathin BiOCl nanosheets@C composites were achieved by one-step hydrothermal route. It was found that the carbon coated on the surface of BiOCl nanosheets not only accelerated the separation of electrons and holes, but also restricted the outward growth of the BiOCl crystal structure to expose more active catalytic sites. In addition, the obtained composites have stable and close interface contact, beneficial for the structural stability of products as well as the rapid charge transfer. The average sheet thickness was in the range of 20-60 nm. Compared with the ability for pure BiOCl to degrade RhB, the degradation rate of the optimal composite can reach 100% within 15 min, while the corresponding photocurrent intensity could reach 5.6 μA$cm-2, and its impedance value was also the smallest. The removal experiments of active substances showed that h+ and ∙O-2 play important roles in the process of photocatalytic degradation. It can be expected that the resulted composites in this work can be used as potential materials for photocatalytic and photoelectrochemical applications. KEYWORDS:
BiOCl; carbon; size; composite; photocatalytic; photoelectrochemical
Contents
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1 Introduction 2 Experimental 2.1 Synthesis of materials 2.2 Characterization 2.3 Photocatalytic activity test 2.4 PEC measurements 3 Results and discussion 4 Conclusions Acknowledgements References
Nowadays, bismuth-based materials attract extensive interests from researchers due to their good light absorption capacity and carrier separation ability [1]. Among bismuthbased photocatalytic semiconductors, BiOCl has been demonstrated as an efficient photocatalyst to solve various energy and environmental problems due to its excellent light-sensing properties, unique layered structure, and good photophysical and chemical properties [2]. What’s more, it is also non-toxic and chemically stable [3]. The introduction of BiOCl in environmental applications was reported by Huang’s group as early as 2006 [4]. However, the high recombination rate of hole–electron pairs and insufficient photocatalytic active sites constrained its practical applica-
Received June 10, 2020; accepted July 20, 2020 E-mail: [email protected]
Introduction
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Front. Mater. Sci.
tions [5–7]. As a result, some strategies have been taken to further improve the photocatalytic performance of BiOCl, such as doping [8–10], materials compositing [7,11], structural regulation [12–13], and surface defects [14– 15]. Among all the above methods, the composite can significantly improve the separation rate of photoinduced electron–hole pairs, thereby improving the photocatalytic activity [16]. As a result, the composite has become a research hotspot in recent years.
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