Journal
CHEMICAL ENGINEERING JOURNAL
Volume 325, Issue -, Pages 690-699Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.05.047
Keywords
Z-scheme; Photocatalytic water splitting; Electron mediator; Cocatalysts; Visible light
Categories
Funding
- Key Project of Chinese National Programs for Research and Development [2016YFC0203800]
- Assembly Foundation of the Industry and Information Ministry of the People's Republic of China [543]
- National Natural Science Foundation of China [51408309, 51578288]
- Science and Technology Support Program of Jiangsu Province [BE2014713]
- Natural Science Foundation of Jiangsu Province [BK20140777]
- Industry-Academia Cooperation Innovation Fund Projects of Jiangsu Province [BY2014004-10]
- Science and technology project of Nanjing [201306012]
- Jiangsu Province Scientific and Technological Achievements into a Special Fund Project [BA2015062]
- Top-notch Academic Programs of Jiangsu Higher Education Institutions
- A Project by the Priority Academic Program Development of Jiangsu Higher Education Institutions
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In this paper, a Z-scheme photocatalytic system was successfully constructed using ZnIn2S4 (ZIS), CoOx-loaded Bi2MoO6 (CoOx/BMO) and reduced graphene oxide (RGO) as H-2-evolving photocatalyst, O(2-)evolving photocatalyst and electron mediator, respectively. The material structures and chemical properties of the constructed Z-scheme photocatalyst were characterized by powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), UV-vis diffuse reflectance spectroscopy (DRS). The photocatalytic activity for water splitting over the Z-scheme photocatalytic systems has been investigated. The results indicated that they not only could steadily split water without any sacrificial agents injected under visible light irradiation, but also could achieve near stoichiometric amount of H-2 and O-2 for the constructed Z-scheme systems using RGO(3%)-CoOx/BMO as O-2-evolving photocatalyst. The amount of H-2 and O-2 can reach 740.4 mu mol.g(-1) and 376.7 mu mol.g(-1) in 24 h. The mechanism for photocatalytic water splitting has been discussed in detail. In addition, the Pt and CoOx cocatalysts were also the indispensable main factors as the H-2-evolving and O-2-evolving active sites in the Z-scheme photocatalytic water splitting system. (C) 2017 Elsevier B.V. All rights reserved.
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