Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 2, Issue 12, Pages 3628-3635Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am100787w
Keywords
cobalt-based; nanocube; nanodiscs; nanoflower; lithium-ion batteries
Funding
- Nanyang Technological University
- Ministry of Education (Singapore) [RG 63/08, M52120096]
- Chinese Academy of Sciences
- National Natural Science Foundation of China [21031005]
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Facile hydrothermal methods have been developed to synthesize large Co3O4 nanocubes, beta-Co(OH)(2) hexagonal nanodiscs and nanoflowers. Samples are thoroughly characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller method, and thermogravimetric analysis. The Co3O4 nanocubes have an average size of about 350 nm with a perfect cubic shape, and the beta-Co(OH)(2) nanodiscs are uniform hexagonal platelets, whereas the beta-Co(OH)(2) nanoflowers are assembled from large sheetlike subunits, After thermal annealing in air at a moderate temperature, the as-prepared beta-Co(OH)(2) samples can be converted into spinel Co3O4 without significant alterations in morphology. We have also Investigated the comparative lithium storage properties of these three Co3O4 samples with distinct morphologies. The nanoflower sample shows highly reversible lithium storage capability after 100 charge-discharge cycles.
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