Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 17, Issue 5, Pages 1596-1604Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201002275
Keywords
batteries; cobalt oxide; lithium; nanostructures; porous materials
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Funding
- 973 National Key Basic Research Program of China [2007CB310500]
- Chinese Ministry of Education [705040]
- National Natural Science Foundation of China [90606009]
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Two kinds of topochemical conversion routes from cobalt hydroxide precursors to cobalt oxide-based porous nanostructures are presented: pyrolysis in air and hydrothermal treatment by the Kirkendall diffusion effect. These cobalt hydroxide precursors were synthesized by a simple hydrothermal approach with sodium acetate as mineralizer at 200 degrees C. Detailed proof indicates that the process of cobalt hydroxide precursor growth is dominated by a nucleation, dissolution, renucleation, growth, and exfoliation mechanism. By the topochemical conversion processes several Co3O4 nanostructures, such as cobalt oxide-coated cobalt hydroxide carbonate nanowires, cobalt oxide nanotubes, hollow cobalt oxide spheres, and porous cobalt oxide nanowires, have been synthesized. The obtained Co3O4 nanostructures have also been evaluated as the anode materials in lithium-ion batteries. It was found that the as-prepared Co3O4 nanostructures exhibited high reversible capacity and good cycle performance due to their porous structure and small size.
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