In this modern era of electronics possessing features like advanced compactness and wearability, flexible all-solid-state supercapacitor devices constructed by using biomass-derived materials are considered as suitable aspirants by virtue of their high energy density, power density, and good cyclic life. Herein, we have constructed a high-performance all-solid-state flexible asymmetric supercapacitor device using coconut fiber derived porous carbon as the anode and a nanocomposite composed of CoFe 2 O 4 nanoparticles (CF) immobilized within the pores of porous carbon (PC) as the cathode. The constructed device possessed a high energy density of 50.34 W h kg −1 at a power density of 1450 W kg −1 and good cycle life (retention of ∼91% specific capacitance (C S ) after ∼5000 cycles). The fabricated device retained its performance even after considerable physical deformation. These excellent features of this device can be credited to the synergy between the CF and PC nanomaterials. CF nanoparticles provide fast redox processes and good power delivery within a few seconds of time, whereas the high surface area (BET surface area ∼1323 m 2 g −1 ) porous carbon possessing structural porosity hosts the CF nanoparticles and also helps in faster ion transfer in the nanocomposite and provides mechanical robustness to the electrode. The results obtained from the present work encourage the augmentation of low-cost electrode material for highly efficient green energy-based electrochemical energy storage (EES) devices.
Magnetic CoFe2O4–gC3N4 nanocomposites
were successfully synthesized, and their photocatalytic
activities toward the decomposition of model synthetic dyes (e.g.,
methylene blue, methyl orange, and Congo red) in the presence of H2O2 were evaluated under simulated solar light irradiation.
The 50CoFe2O4–50gC3N4 nanocomposite exhibited the highest catalytic activity. The catalytic
activity of 50CoFe2O4–50gC3N4 toward the photodegradation of some industrially used
dyes (such as Drimaren Turquoise CL-B p, Drimaren Yellow CL-2R p,
and Drimaren Red CL-5B p) was also examined, and the catalyst exhibited
its capability to decompose the industrial dyes completely. An aqueous
mixture of these dyes was prepared to mimic the dye-containing wastewater,
which was fully photodegraded within 30 min. 50CoFe2O4–50gC3N4 also exhibited facile
magnetic separability from the reaction mixture after the accomplishment
of photocatalysis reaction and stable performance after five cycles.
The high photocatalytic efficiency to degrade several dyes, including
dyes used in textile industries, under solar light irradiation makes
50CoFe2O4–50gC3N4 a promising photocatalyst for the treatment of dye-containing wastewater
discharged from industries.
The energy demand,
the crisis of fossil fuels, and the increasing
popularity of portable and wearable electronics in the global market
have triggered the demand to develop high-performance flexible all-solid-state
supercapacitors that are capable of delivering high energy at high
power density as well as being safely entrenched in those electronics.
Herein, we have designed a nanocomposite, 80CF
hs
-20rGO
sp
, which exhibits a high specific capacitance (
C
S
) value of 1032 F g
–1
at 3 A g
–1
. Utilizing this nanocomposite as the cathode and
reduced graphene oxide sponge (rGO
sp
) as the anode, a flexible
all-solid-state asymmetric device has been fabricated. In this device,
poly(vinyl alcohol) (PVA) gel embedded with a mixture of 3 M KOH and
0.1 M K
4
[Fe(CN)
6
] was used as an electrolyte
cum separator. The fabricated device showed the capability to deliver
an energy density of 65.8 W h kg
–1
at a power density
of 1500 W kg
–1
and retained its capability even
after various physical deformations. The device also exhibited a long
cycle life and retained ∼96% of its
C
S
value after 5000 cycles. Moreover, the fabricated flexible
all-solid-state device successfully illuminated light-emitting diodes,
which proved its potential use in real-life supercapacitor applications.
The obtained results revealed the excellent electrochemical performances
of the fabricated device and rendered it a promising candidate in
the energy sector.
The periodic layered structure due to the well-arranged
sheets
and the presence of surface terminations (-OH, -O, and -F) on those
sheets makes MXene an attractive aspirant for supercapacitor devices.
Though MXene exhibits interesting redox behavior, the collapse of
its layered structure and irreversible stacking of sheets retard its
redox reaction and restrict the ion transport process. To enhance
its electrochemical performance, we have developed a nanocomposite
where the α-Ni(OH)2 petals are slid within the MXene
structure as well as anchored on its surface. The multivalent character
of Ni in Ni(OH)2 enhances the redox performance of the
nanocomposite. Fabrication of a high-performance flexible all-solid-state
asymmetric supercapacitor (ASC) device has been carried out using
this 50MXene-50Ni(OH)2 nanocomposite as the cathode and
the biomass-derived porous carbon as the anode. This ASC device manifested
a high energy density of 29.3 W h kg–1 at a power
density of 800 W kg–1 and 90% retention of specific
capacitance (C
S) even after ∼5000
GCD cycles. This supercapacitor device also demonstrated its mechanically
flexible feature by showing its consistent electrochemical performance
in diverse physical deformations. This flexible device illustrated
its competence in real-world applications by illuminating an assembly
of LED lights.
The rising demand for portable and wearable electronics, biomedical implants, healthcare gadgets, etc., in the global market is triggering the augmentation of flexible supercapacitor devices that can supply sustainable but...
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