Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 16, Pages 4812-4819Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.03.047
Keywords
Graphene nanosheets; Electric double-layer capacitor; Disordered stacking; Pore size distribution; Edges
Categories
Funding
- National Natural Science Foundation of China [50872006]
- Foundation of Excellent Doctoral Dissertation of Beijng City [YB20081001001]
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Graphene nanosheets (GNSs) with narrow mesopore distribution around 4 nm were mass-produced from natural graphite via the oxidation and rapid heating processes. The effects of oxidant addition on the morphology, structure and electrochemical performance of GNSs as electrode materials for electric double-layer capacitor (EDLC) were systematically investigated. The electrochemical properties of EDLC were influenced by the specific surface area, pore characteristics, layer stacking and oxygen-containing functional group contents of electrode materials. Deeper oxidation makes graphite possess both higher specific surface area and more graphene edges, which are favorable for the enhancement of capacitive performance of EDLC. The electrodes with freestanding graphene nanosheets prepared by coating method exhibited good rate capability and reversibility at high scan rates (to 250 mV s(-1)) in electrochemical performances. GNS electrode with specific surface area of 524 m2 g(-1) maintained a stable specific capacitance of 150 F g(-1) under specific current of 0.1 A g(-1) for 500 cycles of charge/discharge. (C) 2010 Elsevier Ltd. All rights reserved.
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