Journal
MATERIALS LETTERS
Volume 224, Issue -, Pages 82-85Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.04.083
Keywords
Semiconductors; Nanocomposites photocatalysis; Hydrogen evolution; Hierarchical structure; NiO/CdS
Funding
- National Natural Science Foundation of China [21673287]
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In this study, oxygen vacancy-rich ultrathin 2D nanosheets NiO were assembled onto 1D nanorod CdS by a facile solvothermal method for photocatalytic H-2 evolution. NiO/CdS with a hierarchical structure exhibits an outstanding photocatalytic activity, the H-2 evolution rate of which is as much as 43 mmol/g/h under visible light. According to various characterization results, photocatalytic mechanism about charge transfer process was proposed. Density functional calculations reveal that oxygen vacancies introduce a defect level in the bandgap of NiO, resulting an increased visible light absorption. Furthermore, the formed heterojunction in NiO/CdS efficiently separates the photogenerated holes and electrons, which enhances the photocatalytic activities. Electron spin resonance (ESR) spectrum and X-ray photoelectron spectroscopy (XPS) were carried out to illustrate the existence of oxygen defect. And the mechanism is proposed based on the concentration of Cd2+ ions after photocatalytic reaction. This study paves a new way to design highly efficient heterostructures rationally for photocatalytic H-2 evolution. (C) 2018 Elsevier B.V. All rights reserved.
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