Journal
APPLIED SURFACE SCIENCE
Volume 258, Issue 8, Pages 3438-3443Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2011.11.091
Keywords
Nitrogen-doped; Grapheme; Hydrothermal; Supercapacitor
Categories
Funding
- National Natural Science Foundation of China [21031001]
- NSFC [20971040, 21101061]
- Youth Foundation of Heilongjiang Province of China [QC2010021]
- Common Universities of Heilongjiang province of China [1154G24]
- Doctoral Research Foundation of Heilongjiang University
- Youth Science Foundation of Heilongjiang University [QL200711]
- Special Fund of Technological Innovation Talents in Harbin City [2011RFQXG01]
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In this work, we developed a concentrated ammonia-assisted hydrothermal method to obtain N-doped graphene sheets by simultaneous N-doping and reduction of graphene oxide (GO) sheets. The effects of hydrothermal temperature on the surface chemistry and the structure of N-doped graphene sheets were also investigated. X-ray photoelectron spectroscopy (XPS) study of N-doped graphene reveals that the highest doping level of 7.2% N is achieved at 180 degrees C for 12 h. N binding configurations of sample consist of pyridine N, quaternary N, and pyridine-N oxides. N doping is accompanied by the reduction of GO with decreases in oxygen levels from 34.8% in GO down to 8.5% in that of N-doped graphene. Meanwhile, the sample exhibits excellent N-doped thermal stability. Electrical measurements demonstrate that products have higher capacitive performance than that of pure graphene, the maximum specific capacitance of 144.6 F/g can be obtained which ascribe the pseudocapacitive effect from the N-doping. The samples also show excellent long-term cycle stability of capacitive performance. (C) 2011 Elsevier B.V. All rights reserved.
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