Supercapacitor performance of hollow carbon spheres by direct pyrolysis of melamine-formaldehyde resin spheres

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 °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.

Keywords

Hollow carbon sphere / Pyrolysis / Melamine-formaldehyde resin / Supercapacitor / Nitrogen-dope

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