Constructing Hierarchical Spheres from Large Ultrathin Anatase TiO2 Nanosheets with Nearly 100% Exposed (001) Facets for Fast Reversible Lithium Storage
Chen, J.S.; Tan, Y.L.; Li, C.M.; Cheah, Y.L.; Madhavi, S.; Boey, F.Y.C.; Archer, L.A.; Lou, X.W.
Synthesis of nanocrystals with exposed high-energy facets is a well-known challenge in many fields of science and technology. The higher reactivity of these facets simultaneously makes them desirable catalysts for sluggish chemical reactions and leads to their small populations in an equilibrated crystal. Using anatase TiO2 as an example, we demonstrate a facile approach for creating high surface area, stable nanosheets comprised of nearly 100% exposed (001) facets. Our approach relies on spontaneous assembly of the nanosheets into three-dimensional, hierarchical spheres that stabilizes them from collapse. We show that the high surface density of exposed TiO2 (001) facets leads to fast lithium insertion/deinsertion processes in batteries that mimic features seen in high power electrochemical capacitors.
AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Hierarchical Spheres; Large Ultrathin; Nearly 100% Exposed (001); Fast Reversible Lithium Storage
Published version can be found at: http://pubs.acs.org/doi/pdf/10.1021/ja100102y
Previously Published As
J. AM. CHEM. SOC. 2010, 132, 6124–6130