Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 769, Issue -, Pages 257-263Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.07.366
Keywords
TiO2@C; Core/shell; Metal-organic framework; Nanobelt; Thickness-controllable; Sodium-ion batteries
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Funding
- National Natural Science Foundation of China [21577086, 41430644]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13078]
- German Research Foundation (DFG) [LE 2249_4-1, LE 2249/5-1]
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An original electrode, 3D TiO2@C core/shell nanobelt arrays with controllable carbon coating thickness, was successfully constructed in this work. The 3D TiO2 nanobelts were directly grown on Ti foil, and then were coated with a layer of metal-organic framework (MOF). After thermal annealing, a porous carbon layer with tunable thickness was coated onto the 3D TiO2 nanobelts through changing the MOF thickness. The as-prepared TiO2@C-2 h with 5-nm-thick carbon layer presented an excellent discharge capacity of 210.5 mAh g(-1) after 100 cycles at a current density of 50 mA g(-1), which is 38% higher than that of pure TiO2 electrode without carbon coating. Moreover, it can maintain a reversible capacity of 141 mAh g(-1) after 1000 cycles at a current density of 200 mA g(-1), and a good rate performance with 33% of capacity retention when the current density increasing from 50 to 5000 mA g(-1). All the results indicate that the TiO2@C core/shell nanobelt array is a promising anode for sodium-ion batteries. (C) 2018 Elsevier B.V. All rights reserved.
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