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|Title:||Thermal formation of mesoporous single-crystal Co3O4 nano-needles and their lithium storage properties|
|Citation:||Lou, X.W., Deng, D., Lee, J.Y., Archer, L.A. (2008). Thermal formation of mesoporous single-crystal Co3O4 nano-needles and their lithium storage properties. Journal of Materials Chemistry 18 (37) : 4397-4401. ScholarBank@NUS Repository. https://doi.org/10.1039/b810093d|
|Abstract:||In this work, we report the simple solid-state formation of mesoporous Co3O4 nano-needles with a 3D single-crystalline framework. The synthesis is based on controlled thermal oxidative decomposition and re-crystallization of precursor β-Co(OH)2 nano-needles. Importantly, after thermal treatment, the needle-like morphology can be completely preserved, despite the fact that there is a large volume contraction accompanying the process: β-Co(OH)2 → Co3O 4. Because of the intrinsic crystal contraction, a highly mesoporous structure with high specific surface area has been simultaneously created. The textual properties can be easily tailored by varying the annealing temperature between 200-400 °C. Interestingly, thermal re-crystallization at higher temperatures leads to the formation of a perfect 3D single-crystalline framework. Thus derived mesoporous Co3O4 nano-needles serve as a good model system for the study of lithium storage properties. The optimized sample manifests very low initial irreversible loss (21%), ultrahigh capacity, and excellent cycling performance. For example, a reversible capacity of 1079 mA h g-1 can be maintained after 50 cycles. The superior electrochemical performance and ease of synthesis may suggest their practical use in lithium-ion batteries. © The Royal Society of Chemistry 2008.|
|Source Title:||Journal of Materials Chemistry|
|Appears in Collections:||Staff Publications|
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