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https://hdl.handle.net/2440/132238
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Type: | Journal article |
Title: | Efficient surface modulation of single-crystalline Na₂Ti₃O₇ nanotube arrays with Ti³⁺ self-doping toward superior sodium storage |
Other Titles: | Efficient surface modulation of single-crystalline Na(2)Ti(3)O(7) nanotube arrays with Ti(3+) self-doping toward superior sodium storage |
Author: | Liu, J. Wang, Z. Lu, Z. Zhang, L. Xie, F. Vasileff, A. Qiao, S.-Z. |
Citation: | ACS MATERIALS LETTERS, 2019; 1(4):389-398 |
Publisher: | American Chemical Society |
Issue Date: | 2019 |
ISSN: | 2639-4979 2639-4979 |
Statement of Responsibility: | Jinlong Liu, Zhenyu Wang, Zhouguang Lu, Lei Zhang, Fangxi Xie, Anthony Vasileff and Shi-Zhang Qiao |
Abstract: | Although Na2Ti3O7-based anodes have been widely investigated in sodium-ion batteries (SIBs), their Na+ storage properties especially high-rate capability and long-term cycling durability are far from practical application, because of their intrinsic low conductivity and unsatisfied Na+ diffusion resistance. Here, we report the surface engineering of Na2Ti3O7 nanotube arrays grown in situ on Ti foil through a hydrothermal method and subsequent NH3-assisted calcination. Benefiting from the effective surface modification, the as-derived free-standing electrode possesses highly crystalline surface with favorable Na+ diffusion kinetics and self-incorporation of abundant Ti3+ for improved electronic conductivity. These features enable the electrode to achieve remarkable reversible capacity (237.9 mAh g–1), ultra-high rate capability (88.5 mAh g–1 at 100 C = 17.7 A g–1), and excellent cycling stability (92.32% capacity retention at 50 C after 5000 cycles), which are superior to the counterpart without surface modification, as well as almost all Na2Ti3O7-based anode materials reported so far for SIBs. The outstanding electrochemical performance demonstrates the feasibility of proposed surface modulation in designing more efficient electrode materials for energy storage. |
Keywords: | Nanotubes, diffusion; electrodes; transmission electron microscopy; electrical conductivity |
Rights: | © 2019 American Chemical Society |
DOI: | 10.1021/acsmaterialslett.9b00213 |
Grant ID: | http://purl.org/au-research/grants/arc/LP160100927 http://purl.org/au-research/grants/arc/DE150101234 http://purl.org/au-research/grants/arc/DP170104464, http://purl.org/au-research/grants/arc/DP160104866, http://purl.org/au-research/grants/arc/DP140104062 http://purl.org/au-research/grants/arc/FL170100154 |
Published version: | http://dx.doi.org/10.1021/acsmaterialslett.9b00213 |
Appears in Collections: | Physics publications |
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