期刊
NANOSCALE RESEARCH LETTERS
卷 8, 期 -, 页码 -出版社
SPRINGEROPEN
DOI: 10.1186/1556-276X-8-2
关键词
Hematite; Hierarchical nanoarchitectures; Hydrothermal; Mesoporous; Lithium-ion batteries
资金
- National Natural Science Foundation of China [21276141]
- State Key Laboratory of Chemical Engineering, China [SKL-ChE-12A05]
- Shandong Province Higher Educational Science and Technology Program, China [J10LB15]
- Excellent Middle-Aged and Young Scientist Award Foundation of Shandong Province, China [BS2010CL024]
Hollow or porous hematite (alpha-Fe2O3) nanoarchitectures have emerged as promising crystals in the advanced materials research. In this contribution, hierarchical mesoporous alpha-Fe2O3 nanoarchitectures with a pod-like shape were synthesized via a room-temperature coprecipitation of FeCl3 and NaOH solutions, followed by a mild hydrothermal treatment (120A degrees C to 210A degrees C, 12.0 h). A formation mechanism based on the hydrothermal evolution was proposed. beta-FeOOH fibrils were assembled by the reaction-limited aggregation first, subsequent and in situ conversion led to compact pod-like alpha-Fe2O3 nanoarchitectures, and finally high-temperature, long-time hydrothermal treatment caused loose pod-like alpha-Fe2O3 nanoarchitectures via the Ostwald ripening. The as-synthesized alpha-Fe2O3 nanoarchitectures exhibit good absorbance within visible regions and also exhibit an improved performance for Li-ion storage with good rate performance, which can be attributed to the porous nature of Fe2O3 nanoarchitectures. This provides a facile, environmentally benign, and low-cost synthesis strategy for alpha-Fe2O3 crystal growth, indicating the as-prepared alpha-Fe2O3 nanoarchitectures as potential advanced functional materials for energy storage, gas sensors, photoelectrochemical water splitting, and water treatment.
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