Photocatalytic Water Oxidation by Hematite/Reduced Graphene Oxide Composites

详细信息    查看全文

• 作者：Fanke Meng ; Jiangtian Li ; Scott K. Cushing ; Joeseph Bright ; Mingjia Zhi ; Joseph D. Rowley ; Zhanglian Hong ; Ayyakkannu Manivannan ; Alan D. Bristow ; Nianqiang Wu
• 刊名：ACS Catalysis
• 出版年：2013
• 出版时间：April 5, 2013
• 年：2013
• 卷：3
• 期：4
• 页码：746-751
• 全文大小：361K
• 年卷期：v.3,no.4(April 5, 2013)
• ISSN：2155-5435

文摘

The photocatalytic water oxidation activity of hematite (伪-Fe₂O₃) has been greatly enhanced by incorporating hematite nanoparticles on the reduced graphene oxide (rGO) nanosheets. Photoelectrochemical measurement results show that coupling the hematite nanoparticles with the rGO greatly increases the photocurrent and reduces the charge recombination rate. Transient absorption spectroscopy and time-domain terahertz spectroscopy have provided the direct evidence that the photogenerated electrons have transferred as the mobile carriers from 伪-Fe₂O₃ to rGO, which enhances the charge separation and suppresses the charge recombination. This work has provided new insight into the mechanism of photocatalysis enhancement by reduced graphene oxide, which has implications in the design of semiconductor/graphene heterojunction photocatalysts.

Keywords:

photocatalyst; hematite; graphene; water splitting; transient absorption spectroscopy