Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 1, Pages 142-151Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b07843
Keywords
hematite; facile synthesis method; high-index facets; photocatalysts; structure analysis
Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [CityU 109213]
- National Natural Science Foundation of China [91333110]
- City University of Hong Kong
- Faculty of Engineering & Information Technologies, The University of Sydney, under the Faculty Research Cluster Program
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Hematite (alpha-Fe2O3) crystals with uniform size and structure are synthesized through very facile one-pot hydrothermal methods without any additive. The as-synthesized sub-micrometer-sized alpha-Fe2O3 crystals with small surface areas perform superb visible light photodegradation activities, even much better than most other alpha-Fe2O3 nanostructures with large surface areas. Profound mechanism analyses reveal that the microwave-assisted hydrothermal (Mic-H) synthesized alpha-Fe2O3 is enclosed by 12 high-index {2-15} facets. The structure and the low unoccupied molecular orbital (LUMO) of the high-index planes result in the excellent photocatalytic activity. This is the first report on the formation of {2-15} plane group of hematite, and the synthesis of the hematite particles with the {2-15} planes is very simple and no any facet-controlling agent is used. This study may pave the way to further performance enhancement and practical applications of the cheap hematite materials.
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