Journal
NANO LETTERS
Volume 11, Issue 7, Pages 2865-2870Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl2012906
Keywords
Photocatalysis; graphene; defect; titania; nanocomposite; solar fuel
Categories
Funding
- Department of Energy Institute for Catalysis in Energy Processes [DE-FG02-03ER15457]
- National Science Foundation
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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With its unique electronic and optical properties, graphene is proposed to functionalize and tailor titania photocatalysts for improved reactivity. The two major solution-based pathways for producing graphene, oxidation-reduction and solvent exfoliation, result in nanoplatelets with different defect densities. Herein, we show that nanocomposites based on the less defective solvent-exfoliated graphene exhibit a significantly larger enhancement in CO2 photoreduction, especially under visible light. This counterintuitive result is attributed to their superior electrical mobility, which facilitates the diffusion of photoexcited electrons to reactive sites.
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