期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 40, 页码 21513-21518出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm33085g
关键词
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资金
- National Natural Science Foundation of China [51002129, 51172191, 11074211]
- National Basic Research Program of China [2012CB921303]
- Cultivation Fund of the Key Scientific and Technical Innovation Project [708068]
- Ministry of Education of China
- Doctoral Program of Higher Education [200805300003]
- China Postdoctoral Science Foundation [20100480068]
- Applied Research Grant of City University of Hong Kong [of 9667051]
An anatase TiO2 nanosheet with discrete integrated subunits was successfully synthesized via a rapid annealing treatment, which could be classified as non-equilibrium conditions on an as-prepared hydrogen titanate nanosheet. This unique TiO2 nano-object is uniform in length and width as a sheet-like shape which is integrated with numerous discrete nanocrystalline subunits. In contrast with the internal architecture of the TiO2 nanosheets produced under equilibrium and non-equilibrium conditions, the local structure collapse transformation mechanism from the hydrogen titanate nanosheet to the anatase TiO2 nanosheet with internal architecture is discussed. This unique anatase nano-object electrode exhibits high reversible lithium ion storage capacities and superior cyclic capacity retention at a high current rate. Such enhanced lithium storage performance could be attributed to the discrete subunits aggregation allowing efficient Li+ ion diffusion and the interior anisotropy in the nanosheet can be more effective to buffer the volume variation during the lithium insertion/desertion cycle.
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