This study reports
a simple one-step hydrothermal method for the
preparation of a Ni(OH)
2
and MnO
2
intercalated
rGO nanostructure as a potential supercapacitor electrode material.
Having highly amorphous rGO layers with turbostratic and integrated
wrinkled flower-like morphology, the as-prepared electrode material
showed a high specific capacitance of 420 F g
–1
and
an energy density of 14.58 Wh kg
–1
with 0.5 M Na
2
SO
4
as the electrolyte in a symmetric two-electrode.
With the successful intercalation of the γ-MnO
2
and
α-Ni(OH)
2
in between the surface of the as-prepared
rGO layers, the interlayer distance of the rGO nanosheets expanded
to 0.87 nm. The synergistic effect of γ-MnO
2
, α-Ni(OH)
2
, and rGO exhibited the satisfying high cyclic stability with
a capacitance retention of 82% even after 10 000 cycles. Thus,
the as-prepared Ni(OH)
2
and MnO
2
intercalated
rGO ternary hybrid is expected to contribute to the fabrication of
a real-time high-performing supercapacitor device.
We are reporting the preparation of a self-doped mesoporous activated carbon by the treatment of waste collected from car engine exhaust. The waste was pyrolyzed at 850°C in N 2 atmosphere using KOH activating agent. Highly porous activated carbon was obtained with the presence of N, O, S, and P as self-dopant. A high specific surface area of 410 m 2 g −1 with the pore volume of 0.5947 cm 3 g −1 was achieved. Electrode prepared with the activated carbon showed a high specific capacitance (280 Fg −1 ) using a 1-butyl-3-methylimidazolium chloride electrolyte. It retained 95% of initial capacitance after 10,000 cycles, demonstrated high cyclic stability and sustainability.
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