Journal
APPLIED SURFACE SCIENCE
Volume 358, Issue -, Pages 28-45Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.08.055
Keywords
Multi-electron; Oxygen reduction; Photocatalyst; Semiconductor
Categories
Funding
- National Natural Science Foundation of China [51072032, 51102001, 51372036, 91233204]
- Key Project of Chinese Ministry of Education [113020A]
- China Postdoctoral Science Foundation [2014M551156]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120043110002]
- National Basic Research Program [2012CB933703]
- 111 project [B13013]
- International Science and Technology Cooperation Program of China [2013DFG50150]
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Semiconductor photocatalysis has attracted significant interest for solar light induced environmental remediation and solar fuel generation. As is well known, photocatalytic performance is determined by three steps: photoexcitation, separation and transport of photogenerated charge carriers, and surface reactions. To achieve higher efficiency, significant efforts have been made on improvement of efficiency of above first two steps, which have been well documented in recent review articles. In contrast, this review intends to focus on strategies moving onto the third step of improvement for enhanced photocatalysis wherein active oxygen species including superoxide radical, hydrogen peroxide, hydroxyl radical are in situ detected. Particularly, surface electron-transfer reduction of oxygen over single component photocatalysts is reviewed and systems enabling multi-electron transfer induced oxygen reduction reaction (ORR) are highlighted. It is expected this review could provide a guideline for readers to better understand the critical role of ORR over photocatalyst in charge carrier separation and transfer and obtain reliable results for enhanced aerobic photocatalysis. (C) 2015 Elsevier B.V. All rights reserved.
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