Journal
NEW JOURNAL OF CHEMISTRY
Volume 39, Issue 5, Pages 4026-4034Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nj00040h
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Funding
- '973' project [2012CB933301]
- '863' project [2011AA050526]
- National Natural Science Foundation of China [20905038, 20903057, 61274065]
- Natural Science Foundation of Jiangsu [BK20141424, BK2011750]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Ministry of Education of China [IRT1148]
- Program of Nanjing University of Posts and Telecommunications [NY214088]
- Open Research Fund of State Key Laboratory of Bioelectronics, Southeast University
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Flowerlike and polyhedral NiO-graphene nanocomposites have been successfully synthesized using a facile hydrothermal method. The formation mechanism of the two nanocomposites with different morphologies has been studied. The resulting products are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopic analysis (XPS), thermogravimetry (TG), and the Brunauer-Emmett-Teller (BET) method. The prepared NiO-graphene nanocomposites with different shapes can be used for supercapacitor electrode materials. Through electrochemical tests, the flowerlike NiO-graphene composite shows higher specific capacitance than that of the polyhedral one with a specific capacitance as high as 500 F g(-1) at a scan rate of 5 mV s(-1) while the polyhedral NiO-graphene composite delivers better long-term cycle stability with 84% specific capacitance remaining after 3000 cycles in a 1 M KOH electrolyte.
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