期刊
APPLIED SURFACE SCIENCE
卷 404, 期 -, 页码 238-245出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.01.312
关键词
Few-layer Graphene; Metalized Si-nanocone arrays; 3D electrodes; Solid-state supercapacitors; Superior rate capability; Large areal capacitance
类别
资金
- Ministry of Science and Technology of China [2016YFA0200803, 2016YFA0200802, 2016YFA0200402, 2016YFB0100500]
- National Natural Science Foundation of China [91323304, 11674387, 61390503, 11574369, 91436102]
- Chinese Academy of Sciences [XDB07020200]
A strategy to promote the energy density of graphene-based supercapacitors by a combination of dry etching and chemical vapor deposition (CVD) techniques is demonstrated. A three dimensional (3D) electrode is composed of vertically oriented graphene that is deposited on metalized silicon nanocones. The design of the 3D electrodes improves specific surface area, electrolyte ion migration and electrical contact, resulting in an enhancement of areal capacitance and rate capability. Furthermore, a solid-state supercapacitor was prepared based on the 3D graphene electrodes and gel polymer electrolyte. The 3D electrode with 10 min of CVD growth of graphene endows the electrical double layer capacitor with the highest areal capacitance of 667.2 mu F cm(-2), which is larger than that of supercapacitors with flat electrodes. (C) 2017 Elsevier B.V. All rights reserved.
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