期刊
ENERGY
卷 69, 期 -, 页码 266-271出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2014.03.003
关键词
Graphene; ZnO; Electrochemical energy storage
资金
- National Natural Science and Henan Province United Foundation of China [U1204601]
- Natural Science Foundation of Henan Province [122300410298]
- Natural Science Foundation of Education Department of Henan Province [13A480365]
- PhD Foundation of Zhengzhou University of Light Industry [2010 BSJJ 029]
3D (Three-dimensional) ZnO (zinc oxide)/rGO (reduced graphene oxide)/ZnO sandwich-structured were synthesized by adding zinc oxide powder to the reaction of graphitic oxide reduction and heating. In this reaction, ZnO nanorods arrays with the size of 20-40 nm grew on both surfaces of rGO sheets directly. Compared with the rGO, the as-obtained ZnO/rGO/ZnO exhibited higher surface area. The electrochemical performance of ZnO/rGO/ZnO electrodes was investigated for energy storage. The maximum specific capacitance of 275 F g(-1) at scan rate of 5 mV s(-1) by chronopotentiometry was achieved for ZnO/rGO/ZnO sandwich-structured in 1.0 M Na2SO4. The hybrid ZnO/rGO/ZnO sandwich-structured exhibited an excellent rate capability and excellent long-term cycling stability as compared with rGO. Such results demonstrated that this ZnO/rGO/ZnO sandwich-structured was a promising candidate of electrode material for high-performance supercapacitor. (C) 2014 Elsevier Ltd. All rights reserved.
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