期刊
CHINESE CHEMICAL LETTERS
卷 32, 期 12, 页码 3847-3851出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2021.05.013
关键词
TiO2; Phosphorus-doping; Carbon coating layer; Anode material; Sodium-ion batteries
资金
- National Natural Science Foundation of China [21875071]
- Guangdong key R&D Program of China [2019B090908001]
A novel two-step route was designed to prepare carbon-coated anatase P-doping TiO2 nanospheres, with successful enhancement of P-doping concentration, resulting in excellent electrochemical performance including enhanced pseudocapacitive behavior and favorable Na+ and electron transferring kinetics.
P-doping is an effective way to modulate the electronic structure and improve the Na+ diffusion kinetics of TiO2, enabling enhanced electrochemical performance. However, it is a challenge to prepare TiO2 with a high P-doping concentration starting from TiO2 in a crystalline state. In this work, we design a novel two-step route for constructing a carbon-coated anatase P-doping TiO2 nanospheres (denote as (P-AnTSS)@NC) with high P-doping concentration, by utilizing amorphous TiO2 nanospheres with the ultra-high specific area as P-doping precursor firstly, and followed by carbon coating treatment. Experimental results demonstrate that P is successfully doped into the crystal lattice and carbon layer is well coated on the surface of TiO2, with P-doping and carbon-coating contents of similar to 13.5 wt% and 10.4 wt%, respectively, which results in the enhanced pseudocapacitive behavior as well as favorable Na+ and electron transferring kinetics. The (P-AnTSS)@NC sample shows excellent rate and cycle performance, exhibiting specific capacities of 177 and 115 mAh/g at 0.1 and 1.0 A/g after 150 and 2000 cycles, respectively. (C) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
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