Photocatalytic Water Oxidation by Hematite/Reduced Graphene Oxide Composites

Photocatalytic Water Oxidation by Hematite/Reduced Graphene Oxide Composites

The photocatalytic water oxidation activity of hematite (α-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 th...

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Veröffentlicht in:ACS catalysis 2013-04, Vol.3 (4), p.746-751
Hauptverfasser: Meng, Fanke, Li, Jiangtian, Cushing, Scott K, Bright, Joeseph, Zhi, Mingjia, Rowley, Joseph D, Hong, Zhanglian, Manivannan, Ayyakkannu, Bristow, Alan D, Wu, Nianqiang
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container_issue 4
container_start_page 746
container_title ACS catalysis
container_volume 3
creator Meng, Fanke
Li, Jiangtian
Cushing, Scott K
Bright, Joeseph
Zhi, Mingjia
Rowley, Joseph D
Hong, Zhanglian
Manivannan, Ayyakkannu
Bristow, Alan D
Wu, Nianqiang
description The photocatalytic water oxidation activity of hematite (α-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 α-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.
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