The
demand for energy storage systems with superior performance
has led to the creation of hybrid supercapacitor device. With proper
designs, the hybrid supercapacitive materials can achieve high performance
while reducing the overall cost. Herein, a novel method is developed
for preparing three-dimensional hierarchical graphitic carbon nanocomposites
with highly dispersed mixed Co–Ni oxide nanoparticles (Co–Ni–O/3DG)
by a facile one-pot process involving carbonization and subsequent
oxidation of metal ion doped biopolymer precursors. The mixed metal
nanoparticles produced during carbonization enabled a top-down preparation
of 3D graphitic carbon nanosheets. The nanocomposites were fully characterized
and showed excellent electrochemical performance supported by the
DFT calculation. Specific capacitance of 1586 F·g–1 was achieved (current density 1.0 A·g–1),
with capacitance retention of 94.5% after 10 000 cycles demonstrating
exceptional cycling stability. In an asymmetric full-cell system using
a Co–Ni–O/3DG positive electrode, high energy densities
of 32.8–54.7 Wh kg–1 associated with very
high power densities of 11358–748.6 W kg–1 were obtained, comparable to the most advanced contemporary supercapacitive
materials, while they also possesses an improved cyclability as well
as using biosourced staring materials, underlining the electrode’s
potential application in hybrid supercapacitor devices.
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