Nitrogen-Doped
Porous Carbon Prepared from Urea Formaldehyde
Resins by Template Carbonization Method for Supercapacitors
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Abstract
Through a simple and convenient template
carbonization method,
nitrogen-doped porous carbon has been successfully achieved by heating
urea formaldehyde (UF) resin and magnesium citrate at 800 °C,
where the magnesium citrate serves as a template. The mass ratio between
the UF resin and magnesium citrate plays a crucial impact on the surface
areas, pore structures, and the correlative capacitive behaviors of
the final porous carbons, denoted as samples UF-Mg-1:1, -1:3, and
-1:5. All present porous carbons exhibited amorphous features with
low graphitization degrees. Sample UF-Mg-1:3 displayed the best capacitive
performance with a large specific capacitance of 239.7 F g<sup>–1</sup> at a current density of 0.5 A g<sup>–1</sup> and a high energy
density of 33.3 Wh kg<sup>–1</sup> at a power density of 0.25
kW kg<sup>–1</sup>. More importantly, it exhibited a high capacitance
retention of 94.4% after 5000 charge/discharge cycles, clearly indicating
good cycling durability