期刊
APPLIED SURFACE SCIENCE
卷 476, 期 -, 页码 948-958出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.01.159
关键词
TiO2 nanotube arrays; Au nanocrystals; Lithium-ion half cells; Electrochemical performance
类别
资金
- Special Talents Science and Technology Innovation Project of Shanxi Province of China [201705D2011007]
- Shanxi Scholarship Council of China [2014029]
- National Natural Science Foundation of China [51474152, 51401143, 51274149]
In this work, we report the synthesis of TiO2 nanotube arrays with Au nanocrystals (Au@TiO2) via magnetron sputtering and thermal annealing at 450 degrees C. The prepared TiO2 nanotube arrays are characterized by field emission scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The annealing leads to the formation of a layer of Au nanocrystals on the surface of TiO2 nanotubes and the dewetting of Au nanofilms on the top of TiO2 nanotube arrays. Using the Au@TiO2 nanotube arrays as anode material, we prepare lithium-ion half cells, and study the electrochemical performance of the lithium-ion half cells. The experimental results show that the lithium-ion half cells with the Au@TiO2 nanotube arrays prepared with the thickest Au film of 160 nm have the smallest charge-transfer resistance and the lithium-ion half cells with TiO2 nanotube arrays have the largest charge-transfer resistance. The specific capacity of the lithium-ion half cells with the Au@TiO2 nanotube arrays prepared with Au nanofilm of 120 nm is similar to 185 mAh.g(-1) , about twice of those with TiO2 nanotube arrays after 200 cycles. The Au nanocrystals in TiO2 nanotube arrays improve the cycle stability of the lithium-ion half cells with the Au@TiO2 nanotube arrays as anode material.
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