The
preparation of porous carbon (PC) with a unique morphology,
appropriate pore size distribution, and heteroatom doping has been
a major challenge for high-performance supercapacitors. Herein, we
developed nematosphere-like N-doped porous carbon (NNPC) via the activation
of a polyaniline@PC (PANI@PC) composite that was acquired through
PANI in situ growth on the surface of PC derived from Al-MOF (MOF,
metal–organic framework). The as-prepared NNPC material possesses
a huge specific surface area of up to 2360 m2 g–1 as well as a pore volume of 1.15 cm3 g–1, exhibiting an excellent specific capacitance (346 F g–1 at 1 A g–1) and amazing rate performance with
78.3% capacitance retention when the working current density swells
from 1 to 100 A g–1. In addition, the electrode
material also displays an extraordinary cyclic stability with an extremely
low capacitance loss of 5.9% over 100 000 cycles at 50 A g–1. Furthermore, this NNPC-based symmetric supercapacitor
delivers a superior energy density of 23.7 W h kg–1 in 6 M KOH with a 0–1.4 V operating voltage. These outstanding
electrochemical performances are attributed to the nematosphere-like
morphology, hierarchical pore structure, and enhanced electrical conductivity
of NNPC for fast ion/charge migration and exchange. This work proposes
a strategy to develop innovative electrode materials by combining
MOF-derived PC and N-rich polymer for supercapacitor applications.
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