Journal
NANO RESEARCH
Volume 5, Issue 5, Pages 327-336Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-012-0213-6
Keywords
Surface tuning; hematite; nanorods; photoanodes
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Funding
- National Natural Science Foundation of China [51102194, 51121092]
- Ministry of Education [20110201120040]
- Natural Science Foundation of Shaanxi Province [2011JQ7017]
- National Basic Research Program of China [2009CB220000]
- Fundamental Research Funds for the Central Universities
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy
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Hematite (alpha-Fe2O3) nanorod films with their surface tuned by W6+ doping have been investigated as oxygen-evolving photoanodes in photoelectrochemical cells. X-ray diffraction, field emission scanning electron microscopy, UV-visible absorption spectroscopy, and photoelectrochemical (PEC) measurements have been performed on the undoped and W6+-doped alpha-Fe2O3 nanorod films. W6+ doping is found to primarily affect the photoluminescence properties of alpha-Fe2O3 nanorod films. Comparisons are drawn between undoped and W6+-doped alpha-Fe2O3 nanorod films, WO3 films, and alpha-Fe2O3-modified WO3 composite electrodes. A close correlation between dopant concentration, photoluminescence intensity, and anodic photocurrent was observed. It is suggested that W6+ surface doping promotes charge transfer in alpha-Fe2O3 nanorods, giving rise to the enhanced PEC performance. These results suggest surface tuning via ion doping should represent a viable strategy to further improve the efficiency of alpha-Fe2O3 photoanodes.
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