Journal
ELECTROCHIMICA ACTA
Volume 219, Issue -, Pages 227-234Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.10.016
Keywords
Mo-doped TiO2; Sodium ion batteries; Lattice expansion; Anode
Categories
Funding
- National Natural Science Foundation of China [21473258, 1673298, 51622406]
- Project of Postdoctoral Innovative Tallents [BX201600192]
- Program for the New Century Excellent Talents in University [NCET-11-0513]
- Distinguished Young Scientists of Hunan Province [13JJ1004]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2015B039]
- Fundamental Research Funds for the Central Universities of Central South University [2016zzts022]
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Gray-colored Mo6+-doped anatase TiO2 is prepared uniformly with particle size of 10-20 nm, and is firstly employed as anode material in sodium-ion batteries (SIBs), presenting excellent electrochemical performances. It delivered reversible specific capacities of 231.8 mAh g(-1) at 0.1 C (33.5 mA g(-1)) after 100 cycles and 108.3 mAh g(-1) at 5C (1.68 Ag-1), comparing to 170.5 mAh g(-1) at 0.1 C and only 41.7 mAh g(-1) at 5C for the bare TiO2. The improved electrochemical performances might be beneficial from the doping of Mo6+, which can effectively enhance the conductivity of TiO2 resulting from induced conduction band electrons, interstitial oxygen defects and vacancies. In addition, the doping can also lead to the lattice expansion, which can facilitate the diffusion of Na+. In combination with natural abundance and environmental benignity, Mo6+-doped TiO2 can be expected to be utilized as an anode material for enhanced sodium storage. (C) 2016 Elsevier Ltd. All rights reserved.
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