期刊
ELECTROCHIMICA ACTA
卷 326, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134972
关键词
Cathodic pulse self-doping; Oxygen vacancies; Hydroxyl groups; Secondary growth; Lithium ion batteries
资金
- National Natural Science Foundation of China [61376017, 21703031]
- Shanghai Sailing Program [17YF1400600]
- National Key R&D Program of China [16D110917, 223201903-41]
- NSFCNRF Scientific Cooperation Program
- Brain Pool Program of Korea [171S-1-3-1829]
- Shanghai Talent Development Funding
- National Research Foundation of Korea [171S-1-3-1829] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this work, we report on fabricating of self-doped TiO2 nanotube arrays via a facile electrochemical method by modify the electrochemical anodized amorphous TiO2 nanotube arrays with cathodic pulse doping. The self-doped TiO2 nanotube arrays is black appearance with abundant oxygen vacancy and hydroxyl groups in comparison with that of as-anodized ones. The initial discharge specific capacity of self-doped TiO2 nanotube anode is 1355 mu A h/cm(2) which is more than four times higher than 338 mu A h/cm(2) of the as-anodized TiO2 nanotube anode in lithium ion batteries. After 100 cycles, the specific capacity of the self-doped TiO2 nanotube electrodes still much higher than that of the as-anodized samples, which is attributed to good tubular morphology retention and secondary growth of the self-doped TiO2 nanotube arrays through the process of insertion/extraction Li+. The controllable regulation of the capacity of self-doped TiO2 anode is also achieved by adjusting electrochemical cathode pulse parameters. It is noteworthy that the cycled anode materials can be used as a catalyst for photocatalytic degradation of methylene blue which may shed light on the resource recovery and the environmental protection. (C) 2019 Elsevier Ltd. All rights reserved.
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