期刊
ELECTROCHIMICA ACTA
卷 295, 期 -, 页码 107-112出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.10.146
关键词
Core/shell nanoarrays heterostructure; Band gap tailoring; Charge redistribution; High capacity; High-rate long cycling life
资金
- National Natural Science Foundation of China - Shanghai Sailing Program [21601122, 51774253, 14YF1409700]
- Science and Technology Planning Project of Sichuan Province, China [2016JY0063]
- 100 Talented Team of Hunan Province
- 111 project at the Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University [B12015]
The intrinsic poor electrical and large volume expansion upon cycling of ZnO raise up challenging kinetic issues. In this work, ZnO@TiO2 core/shell nanorod arrays heterostructure grown directly on carbon cloth is designed and fabricated. The atomic layer deposition coated TiO2 thin layer can not only function as an efficient stress buffer during electrochemical reaction, but also provide enhanced electronic conductivity by forming a heterostructure with ZnO. The ZnO@TiO2 nanorod arrays on carbon cloth can simultaneously achieve the high capacity and high-rate long cycle life (1000 mA h/g for 250 cycles at 1 A/g), which is far superior to that of bare ZnO nanorod arrays on carbon cloth without TiO2 shell. The density functional theory calculations reveal the strong chemical coupling between ZnO and TiO2, which realizes band gap tailoring and significant charge redistribution of both ZnO and TiO2. Such a unique structure endows the as prepared ZnO@TiO2 on carbon cloth great potential as high performance three-dimensional flexible electrode in Li-ion batteries. (C) 2018 Elsevier Ltd. All rights reserved.
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