Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 9, Pages 5720-5729Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta12340d
Keywords
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Funding
- National Natural Science Foundation, China [21673051]
- Department of Science and Technology of Guangdong Province, China [2019A050510043]
- China Scholarship Council [201908440453]
- Hundreds of Talents Program of Sun Yat-sen University
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Anatase TiO2 is a promising anode material for sodium-ion batteries, but its shortcomings in semiconductor properties and sluggish Na+ diffusion kinetics hinder further development. A heterojunction TiO2@TiOF2 structure constructed with two-dimensional nanosheets shows stable cycling performance for up to 10,000 cycles at high current densities, attributed to its unique structure and the in situ formation of a NaF protective layer. Density functional theory calculations indicate that the heterostructure TiO2@TiOF2 nanosheets exhibit improved electrical conductivity and lower formation energies of Na+ ions compared to the separated TiO2 and TiOF2.
Anatase TiO2 is considered as a promising anode material for sodium-ion batteries, but the inherent semiconductor properties and the sluggish Na+ diffusion kinetics limit its further development. To overcome these inherent drawbacks, heterojunction TiO2@TiOF2 constructed with two-dimensional nanosheets is prepared by the hydrothermal method. When heterojunction TiO2@TiOF2 is used as a sodium ion battery material, a stable cycling performance of up to 10 000 cycles can be achieved at a high current density of 5000 mA g(-1), probably due to the heterojunction structure, the exposed (0 0 1) facet of TiO2 and the in situ formed NaF protective layer. Density functional theory (DFT) calculations further reveal that the heterostructure TiO2@TiOF2 nanosheets possess better electrical conductivity and lower formation energies of Na+ ions than those of the separated TiO2 and TiOF2. This work offers a new strategy to design novel heterojunction structures for the electrochemical sodium storage.
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