1 research outputs found
Lamellar Hierarchical Porous Carbon Prepared from Coal Tar Pitch through a Lamellar Hard Template Combined with the Precarbonization and Activation Method for Supercapacitors
The lamellar porous carbon favors the diffusion and penetration
of electrolyte ions and presents a fantastic advantage as an energy
storage electrode material. In this work, the lamellar Mg5(OH)4(CO3)2·4H2O
template is synthesized via a simple precipitation method in the low-temperature
hydrothermal condition. Lamellar hierarchical porous carbon (LHPC)
is successfully synthesized through the Mg5(OH)4(CO3)2·4H2O hard template and
the KOH activation method using coal tar pitch (CTP) as the carbon
source. The effects of activation temperature and activator dosage
on the morphology, microstructure, and supercapacitor performance
are researched at length. LHPCs-1–700 displays a good lamellar
structure and an abundant mesoporous structure, so as to exhibit superior
capacitive performance compared with other carbon electrodes. The
specific capacitance for LHPCs-1–700 reaches 298 F g–1 at 1 A g–1 and still maintains 234 F g–1 at 50 A g–1 with a high capacitance retention
of 78.5% in the three-electrode system. The kinetic behavior of the
LHPCs-1–700 electrode was also analyzed according to the CV
data obtained at different scan rates, and it was found that the fast
kinetic capacitance contribution was up to 87% at 200 mV s–1. The assembled LHPCs-1–700 symmetric supercapacitor delivered
an energy density of 16.73 W h kg–1 with a power
density of 859.4 W kg–1 in 1 M Na2SO4 solution. Besides, the specific capacitance retention rate
could still reach 95.8% after 8000 cycles