Journal
JOURNAL OF POWER SOURCES
Volume 308, Issue -, Pages 149-157Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.01.071
Keywords
Nitrogen-doped graphene; Vanadium nitride; Anode materials; Supercapacitors; Specific capacitance
Funding
- Converging Research Center Program through the Ministry of Science, ICT & Future Planning of Korea [2014M3C1A8048834]
- Basic Research Laboratory Program through the Ministry of Science, ICT & Future Planning of Korea [2014R1A4A1008140]
- National Research Foundation of Korea [2014R1A4A1008140, 2014M3C1A8048834] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Novel vanadium nitride/nitrogen-doped graphene (VN/NG) composite was fabricated and used as stable high performance anode materials for supercapacitors. The VN/NG composite anode material exhibited excellent rate capability, outstanding cycling stability, and superior performance. FE-SEM and TEM studies of VN/NG composite revealed that ultra-thin VN nanostructures were homogeneously distributed on flexible NG nanosheets. The NG provided a highly conductive network to boost the charge transport involved during the capacitance generation and also aided the dispersion of nanostructured VN within the NG network. The synergetic VN/NG composite exhibited an ultra-high specific capacitance of 445 F g(-1) at 1 Ag-1 with a wide operation window (-1.2 to 0 V) and showed outstanding rate capability (98.66% capacity retention after 10,000 cycles at 10 Ag-1). The VN/NG electrode offered a maximum energy density (similar to 81.73 Wh kg(-1)) and an ultra-high power density (similar to 28.82 kW kg(-1) at 51.24 Wh kg(-1)). The cycling performance of the VN/NG composite was superior to that of pure VN nanostructure. These finding open a new path way to the designated fabrication of VN/NG composite as anode materials in the development of high performance energy storage devices. (C) 2016 Elsevier B.V. All rights reserved.
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