Journal
CARBON
Volume 94, Issue -, Pages 879-887Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2015.07.069
Keywords
Supercapacitor; Gas-foaming method; Three-dimensional graphene layers; Electrochemical capacitive behavior
Funding
- National Natural Science Foundation of China [21273085]
- Natural Science Foundation of Guangdong Province, China [S2011010003416, S2013010012927]
- Fundamental Research Funds for the Central Universities [13lgjc10]
- Scientific Research Foundation of Graduate School of South China Normal University [2014ssxm30]
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Inspired by baking bread, our research group demonstrates a novel method for baking three-dimensional (3D) graphene layers with an open porous network, pore size in the range of dozens of nanometers to several hundred nanometers, and a pore wall thickness of about 10 nm. Such continuously cross-linking structures not only effectively overcome the restacking and agglomeration of graphene nanosheets but also possess more channels between nanosheets to lower the resistance for electron access to the inter-space. Compared with reduced graphene oxide (rGO) prepared at the same temperature, the unique 3D porous-structured graphene layers also contain 4.3 at.% nitrogen. When the 3D graphene layers are employed as an active electrode material for a supercapacitor, a high specific capacitance (SC) of 231.2 F g(-1) at 1 A g(-1) is displayed after electrochemical activation, approximately two times that of rGO. Only <1.0% of the capacitance degrades after 8000 cycles, exhibiting its excellent cycle stability; furthermore, it liberates a high energy density of 32.1 Wh kg(-1) at a power density of 500 W kg(-1). The attractive performances of 3D graphene layers make them a promising candidate as an electrode material for supercapacitors. (C) 2015 Elsevier Ltd. All rights reserved.
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