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Fabrication of Nb2O5 nanosheets for high-rate lithium ion storage applications.

Liu M, Yan C, Zhang Y - Sci Rep (2015)

Bottom Line: Nb2O5 nanosheets are successfully synthesized through a facile hydrothermal reaction and followed heating treatment in air.Such a unique two dimensional structure enables the nanosheet electrode with superior performance during the charge-discharge process, such as high specific capacity (~184 mAh·g(-1)) and rate capability.These results suggest the Nb2O5 nanosheet is a promising candidate for high-rate lithium ion storage applications.

View Article: PubMed Central - PubMed

Affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, China.

ABSTRACT
Nb2O5 nanosheets are successfully synthesized through a facile hydrothermal reaction and followed heating treatment in air. The structural characterization reveals that the thickness of these sheets is around 50 nm and the length of sheets is 500 ~ 800 nm. Such a unique two dimensional structure enables the nanosheet electrode with superior performance during the charge-discharge process, such as high specific capacity (~184 mAh·g(-1)) and rate capability. Even at a current density of 1 A·g(-1), the nanosheet electrode still exhibits a specific capacity of ~90 mAh·g(-1). These results suggest the Nb2O5 nanosheet is a promising candidate for high-rate lithium ion storage applications.

No MeSH data available.


XRD patterns of Nb foil, precursor Nb3O7F and intermediates obtained with different reaction times.The standard diffraction pattern of Nb3O7F (JCPDS card No. 74-2363) is shown as a reference.
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f2: XRD patterns of Nb foil, precursor Nb3O7F and intermediates obtained with different reaction times.The standard diffraction pattern of Nb3O7F (JCPDS card No. 74-2363) is shown as a reference.

Mentions: We investigated the effect of different hydrothermal conditions on the resultant Nb3O7F crystal structure and morphologies. The reaction time has been found playing a crucial role in controlling the nucleation and growth of crystallites during the hydrothermal system. As shown in Fig. 2, XRD patterns of the solids samples prepared at 160°C with different reaction time indicates pronounced changes in crystal structure during the reaction. XRD patterns of the sample obtained in 3 h are different from that of raw materials Nb, suggesting a new crystal phase forms at the expense of Nb in a short period. With prolonging the reaction time to 6 h, a new diffraction peak appears at 2θ = 22.5°, which can be indexed as Nb3O7F. Increasing the reaction time to 8 h, it can be found that the diffraction peak at 2θ = 36.6° almost disappear, indicating the crystal phase formed in 3 h degrades readily in the subsequent reaction process. All diffraction peaks of the sample prepared with 12 h are indexed to Nb3O7F (JCPDS card No. 74-2363). Further prolonging the reaction time to 24 h or 48 h, the XRD patterns are similar, demonstrating the as-obtained samples are pure Nb3O7F with the reaction time at and longer than 12 h.


Fabrication of Nb2O5 nanosheets for high-rate lithium ion storage applications.

Liu M, Yan C, Zhang Y - Sci Rep (2015)

XRD patterns of Nb foil, precursor Nb3O7F and intermediates obtained with different reaction times.The standard diffraction pattern of Nb3O7F (JCPDS card No. 74-2363) is shown as a reference.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4321166&req=5

f2: XRD patterns of Nb foil, precursor Nb3O7F and intermediates obtained with different reaction times.The standard diffraction pattern of Nb3O7F (JCPDS card No. 74-2363) is shown as a reference.
Mentions: We investigated the effect of different hydrothermal conditions on the resultant Nb3O7F crystal structure and morphologies. The reaction time has been found playing a crucial role in controlling the nucleation and growth of crystallites during the hydrothermal system. As shown in Fig. 2, XRD patterns of the solids samples prepared at 160°C with different reaction time indicates pronounced changes in crystal structure during the reaction. XRD patterns of the sample obtained in 3 h are different from that of raw materials Nb, suggesting a new crystal phase forms at the expense of Nb in a short period. With prolonging the reaction time to 6 h, a new diffraction peak appears at 2θ = 22.5°, which can be indexed as Nb3O7F. Increasing the reaction time to 8 h, it can be found that the diffraction peak at 2θ = 36.6° almost disappear, indicating the crystal phase formed in 3 h degrades readily in the subsequent reaction process. All diffraction peaks of the sample prepared with 12 h are indexed to Nb3O7F (JCPDS card No. 74-2363). Further prolonging the reaction time to 24 h or 48 h, the XRD patterns are similar, demonstrating the as-obtained samples are pure Nb3O7F with the reaction time at and longer than 12 h.

Bottom Line: Nb2O5 nanosheets are successfully synthesized through a facile hydrothermal reaction and followed heating treatment in air.Such a unique two dimensional structure enables the nanosheet electrode with superior performance during the charge-discharge process, such as high specific capacity (~184 mAh·g(-1)) and rate capability.These results suggest the Nb2O5 nanosheet is a promising candidate for high-rate lithium ion storage applications.

View Article: PubMed Central - PubMed

Affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, China.

ABSTRACT
Nb2O5 nanosheets are successfully synthesized through a facile hydrothermal reaction and followed heating treatment in air. The structural characterization reveals that the thickness of these sheets is around 50 nm and the length of sheets is 500 ~ 800 nm. Such a unique two dimensional structure enables the nanosheet electrode with superior performance during the charge-discharge process, such as high specific capacity (~184 mAh·g(-1)) and rate capability. Even at a current density of 1 A·g(-1), the nanosheet electrode still exhibits a specific capacity of ~90 mAh·g(-1). These results suggest the Nb2O5 nanosheet is a promising candidate for high-rate lithium ion storage applications.

No MeSH data available.