Polytriazine
with high nitrogen content (c.a. 50.5 wt %) has been
synthesized by an ultrafast microwave-assisted method using melamine
and cyanuric chloride. The nitrogen-enriched nanoporous polytriazine
(NENP-1) has exhibited high specific surface area (maximum SABET of 838 m2 g–1) and narrow
pore size distribution. The NENP-1 has been employed as electrode
material for supercapacitor application. A maximum specific capacitance
(Csp) of 1256 F g–1 @1 mV s–1 and 656 F g–1 @1 A g–1 are estimated
from the cyclic voltammetry (CV) and galvanostatic charge/discharge
(GCD) measurements, respectively, in a three-electrodes configuration.
This Csp value is considered as very high for a nonmetallic
system (organic polymer). Superior capacitance retention of 87.4%
of its initial Csp was observed after 5000 cycles at a
current density of 5 A g–1 and demonstrates its
potential as an efficient electrode material for practical applications.
To test this claim, an asymmetric supercapacitor device (ASCD) was
fabricated. The Csp values of the device in the two-electrode
configuration are 567 F g–1 @5 mV s–1 and 287 F g–1 @4 A g–1 in the
CV and GCD measurements, respectively. The ASCD has shown superior
energy density and power density of 102 Wh kg−1 and
1.6 kW kg–1, respectively, at the current density
of 4 A g–1. The energy density is much higher than
the best reported supercapacitors and also close to the commercial
batteries. This indicates the material could bridge the gap between
the commercial batteries and supercapacitors.
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