Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 201, Issue -, Pages 495-502Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2016.08.049
Keywords
BiOCl; Bismuth; Photocatalytic; Monochromated EELS; Electron microscopy
Funding
- National Basic Research Program of China [2015CB654900]
- National Natural Science Foundation of China [11474147, 51302132, 51407029, 21377049, 2013CB932900]
- Jiangsu Shuangchuang Program
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- Fundamental Research Funds for the Central Universities
- High Performance Computing Platform of the Southeast University
- Nanjing University Undergraduate Innovation Program [S201510284040]
- National Training Program of Innovation and Entrepreneurship for Undergraduates [G201610284088]
- Jiangsu Province Science and Technology Support Program [BE2013118]
- Nanjing Science and Technology Commission platform [030002]
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State-of-the-art electron microscopy has enabled us to investigate microstructural details down to sub-subangstrom and milli-electron-volt resolution level. The enhanced photoreactivity over bismuth hybridized BiOCl catalyst (Bi/BiOCl) has been reported recently, however, the mechanistic understandings of this improved photoreactivity especially the optical behavior of bismuth nanoparticles (Bi NPs) are still obscured and in debate. The optical absorption features of Bi NPs and the charge transfer characteristic between bismuth and BiOCl have been considered as the major physicochemical origin for the promoted photoreactivity. Based on the advanced (in-situ) electron microscopy of monochromated electron energy loss spectroscopy in scanning transmission electron microscopy imaging mode (Mono STEM-EELS) along with related theoretical investigations, in this work, we for the first time distinguished and explained the optical absorption originated from the localized surface plasmon resonances (LSPR) effect and direct band gap transition in an individual bismuth nanoparticle as well as transportation of photogenerated carriers at the interface of Bi/BiOCl. These findings could provide better understandings about the origin of the improved photoreactivity of various bismuth-hybridized photocatalysts. (C) 2016 Elsevier B.V. All rights reserved.
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