Journal
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
Volume 29, Issue 4, Pages 735-742Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s40242-013-3181-9
Keywords
Hollow carbon sphere; Pyrolysis; Melamine-formaldehyde resin; Supercapacitor; Nitrogen-dope
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Funding
- National Natural Science Foundation of China [51072048, 51102083]
- Natural Science Foundation of Heilongjiang Province, China [JC201211, B201107]
- Program for Science and Technology Project of Heilongjiang Province, China [WB10A204]
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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 A degrees C) 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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