Supercapacitor Performance of Hollow Carbon Spheres by Direct Pyrolysis of Melamine-formaldehyde Resin Spheres |
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| Authors: | MA Fang-wei SUN Li-ping ZHAO Hui LI Qiang HUO Li-hua XIA Tian GAO Shan |
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| Affiliation: | 1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, P. R. China;
2. Key Laboratory of Chemical Engineering Process &Technology for High-efficiency Conversion of Heilongjiang Province, Heilongjiang University, Harbin 150080, P. R. China |
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| Abstract: | The nitrogen and oxygen co-doped hollow carbon spheres(HCSs) were prepared via a simple pyrolysis of solid melamine-formaldhyde resin spheres. The carbonization temperature has an important influence on the specific surface area, pore-size distribution and heteroatom contents of HCSs. The synergistic effects of those physical and chemical properties on supercapacitor performance were systematically investigated. Among the HCSs obtained at different temperatures, HCSs-800(co-doped HCSs at 800 ℃) exhibits the best reversible specific capacitance in 2 mol/L H2SO4 electrolyte and meanwhile maintains a high-class capacitance retention capability. The nitrogen heteroatoms were confirmed to play a crucial role in improving capacitance in an acid medium. This kind of nitrogen doped HCSs is a potential candidate for an efficient electrode material for supercapacitors. |
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| Keywords: | Hollow carbon sphere Pyrolysis Melamine-formaldehyde resin Supercapacitor Nitrogen-dope |
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