Polymer Composites,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 21, 2024
Abstract
Manganese
oxides
have
emerged
as
promising
electrode
materials
for
supercapacitors.
Despite
extensive
efforts
to
improve
their
conductivity
and
structural
stability
through
various
manganese
oxide/conductor
nanocomposites,
achieving
efficient
reliable
energy
storage
has
remained
challenging.
In
this
study,
we
propose
a
meticulous
“dual
enhancement”
strategy,
where
three‐dimensional
(3D)
nanostructured
polyaniline/manganese
oxide
composites
(PM)
are
synthesized
via
an
in
situ
method
further
integrated
with
graphene
wrapping
form
oxide/graphene
nanocomposites
(PMG).
Electrochemical
characterization
reveals
that
PMG
exhibits
remarkable
specific
capacitance
of
up
403
F
g
−1
(at
1
A
),
favorable
retention
80.2%
after
5000
cycles,
along
wide
potential
window.
This
enhancement
is
attributed
the
synergistic
effects
polyaniline,
which
provides
supportive
framework
electron
transport
pathways,
graphene,
offers
external
protection
enhances
pathways.
Assembled
symmetrical
supercapacitors
demonstrate
outstanding
density
(32.7–23.3
Wh
kg
)
power
(720–4500
W
at
high
operating
voltage
1.8
V,
surpassing
performance
many
reported
high‐performance
study
valuable
insights
advancing
expected
catalyze
widespread
adoption
applications.
Highlights
“Dual
implemented
by
PANI
supporting
rGO
wrapping.
The
composite
greatly
enhanced.
Improved
(403
,
cycling
(80.2%)
achieved.
supercapacitor
(32.7
).
Abstract
The
strategic
enhancement
of
manganese–oxygen
(Mn─O)
covalency
is
a
promising
approach
to
improve
the
intercalation
kinetics
sodium
ions
(Na⁺)
in
manganese
dioxide
(MnO
2
).
In
this
study,
an
augmenting
Mn─O
MnO
by
strategically
incorporating
cobalt
at
oxygen
edge‐sharing
Co
octahedral
sites
focused
on.
Both
experimental
results
and
density
functional
theory
(DFT)
calculations
reveal
increased
electron
polarization
from
manganese,
surpassing
that
directed
toward
cobalt,
thereby
facilitating
enhanced
transfer
strengthening
covalency.
synthesized
Co–MnO
material
exhibits
outstanding
electrochemical
performance,
demonstrating
superior
specific
capacitance
388
F
g
−1
1
A
maintaining
97.21%
capacity
retention
after
12000
cycles.
Additionally,
asymmetric
supercapacitor
constructed
using
achieved
high
energy
35
Wh
kg
power
1000
W
,
underscoring
efficacy
practical
applications.
This
work
highlights
critical
role
transition
metal–oxygen
interactions
optimizing
electrode
materials
introduces
robust
enhance
properties
oxides,
advancing
high‐performance
storage
technologies.
Polymer Composites,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 21, 2024
Abstract
Manganese
oxides
have
emerged
as
promising
electrode
materials
for
supercapacitors.
Despite
extensive
efforts
to
improve
their
conductivity
and
structural
stability
through
various
manganese
oxide/conductor
nanocomposites,
achieving
efficient
reliable
energy
storage
has
remained
challenging.
In
this
study,
we
propose
a
meticulous
“dual
enhancement”
strategy,
where
three‐dimensional
(3D)
nanostructured
polyaniline/manganese
oxide
composites
(PM)
are
synthesized
via
an
in
situ
method
further
integrated
with
graphene
wrapping
form
oxide/graphene
nanocomposites
(PMG).
Electrochemical
characterization
reveals
that
PMG
exhibits
remarkable
specific
capacitance
of
up
403
F
g
−1
(at
1
A
),
favorable
retention
80.2%
after
5000
cycles,
along
wide
potential
window.
This
enhancement
is
attributed
the
synergistic
effects
polyaniline,
which
provides
supportive
framework
electron
transport
pathways,
graphene,
offers
external
protection
enhances
pathways.
Assembled
symmetrical
supercapacitors
demonstrate
outstanding
density
(32.7–23.3
Wh
kg
)
power
(720–4500
W
at
high
operating
voltage
1.8
V,
surpassing
performance
many
reported
high‐performance
study
valuable
insights
advancing
expected
catalyze
widespread
adoption
applications.
Highlights
“Dual
implemented
by
PANI
supporting
rGO
wrapping.
The
composite
greatly
enhanced.
Improved
(403
,
cycling
(80.2%)
achieved.
supercapacitor
(32.7
).
