Surface tuning for promoted charge transfer in hematite nanorod arrays as water-splitting photoanodes
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- 作者：Shaohua Shen (12) shshen_xjtu@mail.xjtu.edu.cn
Coleman X. Kronawitter (2)
Jiangang Jiang (1)
Samuel S. Mao (2)
Liejin Guo (1) lj-guo@mail.xjtu.edu.cn - 关键词：Surface tuning – ; hematite – ; nanorods – ; photoanodes
- 刊名：Nano Research
- 出版年：2012
- 出版时间：May 2012
- 年：2012
- 卷：5
- 期：5
- 页码：327-336
- 全文大小：662.0 KB
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- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chinese Library of Science
Chemistry
Nanotechnology - 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
- ISSN：1998-0000
文摘
Hematite (α-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 α-Fe2O3 nanorod films. W6+ doping is found to primarily affect the photoluminescence properties of α-Fe2O3 nanorod films. Comparisons are drawn between undoped and W6+-doped α-Fe2O3 nanorod films, WO3 films, and α-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 α-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 α-Fe2O3 photoanodes.