10.1021/acssuschemeng.9b01455.s001
Chengshuai Chang
Chengshuai
Chang
He Wang
He
Wang
Yunqiang Zhang
Yunqiang
Zhang
Shulan Wang
Shulan
Wang
Xuan Liu
Xuan
Liu
Li Li
Li
Li
Fabrication of Hierarchical Porous Carbon Frameworks
from Metal-Ion-Assisted Step-Activation of Biomass for Supercapacitors
with Ultrahigh Capacitance
American Chemical Society
2019
CPF
density
biochar materials
Chinese parasol fluff
Hierarchical Porous Carbon Frameworks
design strategy route
metal-ion-assisted step-activation method
capacitance
CO
metal ion additive
KOH
Ultrahigh Capacitance Advancement
BMIMBF
supercapacitor electrode material
energy storage devices
2019-05-22 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Fabrication_of_Hierarchical_Porous_Carbon_Frameworks_from_Metal-Ion-Assisted_Step-Activation_of_Biomass_for_Supercapacitors_with_Ultrahigh_Capacitance/8224298
Advancement
in the application of biomass-derived carbon is viewed
as one of the most important drivers of sustainable and renewable
technologies for energy storage. High-performance biochar with a well-defined
structure is extremely attractive as a supercapacitor electrode material.
Herein, carbon with an ultrahigh capacitance of 682 F/g at 0.2 A/g
for biochar materials and remarkable cycling stability was synthesized
from Chinese parasol fluff (CPF). Three-dimensional interconnected
hierarchical porous carbon was fabricated via a feasible metal-ion-assisted
step-activation method from the biomass precursor. CO<sub>2</sub> was
used to treat the carbonaceous material from CPF after molten KOH
activation for pore structure tuning, while Co<sup>2+</sup> was selected
as the metal ion additive for directing graphitization. In addition
to the extremely high capacitance, the as-synthesized carbon also
delivered an energy density of 46.38 W h/kg at a power density of
300 W/kg in 1-butyl-3-methyl imidazolium tetrafluoroborate/acetonitrile
(BMIMBF<sub>4</sub>/AN) electrolyte, which is much better than for
most reported biochar materials and about 10 times better than for
commercial supercapacitors. The current work points out an excellent
sustainable source for fabrication of high-performance electrode materials
and, more importantly, a feasible design strategy route for improvement
of the electrochemical performance of energy storage devices.