Journal
ACS CATALYSIS
Volume 3, Issue 4, Pages 746-751Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs300740e
Keywords
photocatalyst; hematite; graphene; water splitting transient absorption spectroscopy
Categories
Funding
- State of West Virginia [EPS08-01]
- West Virginia University Research Corporation
- West Virginia EPSCoR Office
- National Science Foundation [1102689]
- National Science Foundation of China (NSFC) [51072180]
- Division Of Graduate Education
- Direct For Education and Human Resources [1102689] Funding Source: National Science Foundation
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The photocatalytic water oxidation activity of hematite (alpha-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 alpha-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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