Abstract
Recently,
transition
metal
silicates
(TMSs)
have
garnered
significant
attention
as
promising
candidates
for
electrode
materials
in
supercapacitors
(SCs),
especially
cobalt
silicate
(Co
2
SiO
4
,
CoSi)
related
materials.
However,
due
to
the
poor
conductivity
and
narrow
potential
range
of
CoSi,
its
electrochemical
properties
are
not
fully
developed
far
from
desirable.
Herein,
enhance
hollow
spheres
Mn‐doped
CoSi
(CoMnSi)
were
fabricated
through
a
hydrothermal
method.
The
dopant
Mn
facilitates
formation
CoMnSi
assembled
by
nanosheets
these
connect
with
each
other
form
core‐shell
architecture.
effect
Mn/Co
ratio
on
has
been
investigated.
CoMnSi‐2
(Mn/Co
=
1/9)
displays
specific
capacitance
495
F
g
−1
at
0.5
A
surpassing
that
(279
)
manganese
(denoted
MnSi,
38
).
CoMnSi‐2//active
carbon
hybrid
supercapacitor
(CoMnSi‐2//AC
HSC)
achieves
181
mF
cm
−2
(151
1
mA
energy
density
0.644
Wh
m
W
.
device
practical
application
powering
LED
lamp
circuit
bulb
working
more
than
25
min
repeatedly.
performance
achieved
is
superior
some
state‐of‐the‐art
TMSs.
Density
functional
theory
calculations
provided
evidence
Mn‐doping
enhances
electronic
reduces
electron
transport
barrier
boosting
properties.
This
work
supplies
strategy
tailoring
structures
TMSs
their
performance.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 8, 2024
N-doped
porous
carbon
materials
possess
abundant
pores
and
nitrogen
functionalities,
holding
significant
potential
for
supercapacitors.
However,
achieving
precise
control
of
the
pore
structure
to
enhance
electrochemical
performance
remains
challenging
in
large-scale
production
commercial
electrode
materials.
Herein,
Chinese
yam,
a
rhizome
plant
rich
dopamine,
is
selected
as
precursor
prepare
N,O-codoped
hierarchical
(N/O-PC-3)
via
one-step
carbonization
activation
process.
The
precisely
controlled
by
adjusting
degree
aggregation
zinc-containing
hydrolysates
biomass
through
synergistic
action
ZnCl2
(activating
agent)
NH4Cl
(nitrogen
source).
Due
its
micropore-dominant
structure,
high
(10.5
at.
%)
oxygen
(13.1
content,
along
with
good
electronic
conductivity
excellent
wettability,
N/O-PC-3
exhibits
remarkable
frequency
response,
an
ultrahigh
rate
up
5
V
s–1
gravimetric,
volumetric,
areal
capacitances
414
F
g–1,
311
cm–3,
23.8
μF
cm–2
at
1
A
respectively.
It
also
demonstrates
capability
(326
g–1
100
79%
capacitance
retention).
Even
mass
loading
15
mg
cm–2,
achieves
gravimetric
223
g–1.
assembled
symmetric
supercapacitor
delivers
energy
density
22.9
W
h
kg–1
power
102.9
kg–1,
making
it
highly
desirable
practical
application
storage.
Additionally,
this
work
offers
straightforward
approach
controlling
Energies,
Год журнала:
2024,
Номер
17(11), С. 2585 - 2585
Опубликована: Май 27, 2024
With
the
rapid
development
of
new
energy
industry,
supercapacitors
have
become
key
devices
in
field
storage.
To
forecast
remaining
useful
life
(RUL)
supercapacitors,
we
introduce
a
technology
that
integrates
variational
mode
decomposition
(VMD)
with
bidirectional
long
short-term
memory
(BiLSTM)
neural
network.
Firstly,
aging
experiments
under
various
temperatures
and
voltages
were
carried
out
to
obtain
data.
Then,
VMD
was
implemented
decompose
data,
which
helped
eliminate
disturbances,
including
capacity
recovery
test
errors.
hyperparameters
BiLSTM
adjusted,
employing
sparrow
search
algorithm
(SSA)
improve
consistency
between
input
data
network
structure.
After
obtaining
optimal
BiLSTM,
decomposed
into
for
prediction.
The
experimental
results
showed
VMD-SSA-BiLSTM
model
proposed
this
paper
has
high
prediction
accuracy
robustness
different
voltages,
an
average
RMSE
0.112519,
decrease
44.3%
compared
minimum
0.031426.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(23)
Опубликована: Фев. 12, 2024
Abstract
Here,
poly(
N
‐acryloylglycinamide‐
co
‐vinyltriazole)
p(NAGA‐
‐VTZ)
supramolecular
polymer
hydrogel
doped
with
carbonized
and
activated
polypyrrole
nanotubes
as
a
high‐strength
self‐healable
material
is
presented
for
supercapacitors.
Initially,
the
films
are
synthesized
by
photopolymerization
of
‐acryloylglycinamide
1‐vinyl‐1,2,4‐triazole
without
use
any
cross‐linkers.
The
hydrogels
demonstrated
remarkable
self‐healing
ability
via
hydrogen
bonding
at
temperatures
above
upper
critical
solubility
temperature,
excellent
mechanical
properties
(0.86
MPa),
large
stretchability
(1300%)
cut
resistance.
Subsequently,
ethanol/KOH‐activated
(acNTs)
prepared
active
electrochemical
double‐layer
capacitors
(EDLC).
Then,
symmetric
supercapacitor
employing
hydrogel,
acNTs
aqueous
3
m
KCl
solution
assembled.
Cyclic
voltammetry
galvanostatic
charge–discharge
measurements
show
that
device
gives
specific
capacitance
282.62
F
g
−1
0.2
A
high
areal
316.86
mF
cm
−2
scan
rate
10
mV
s
.
Importantly,
operates
over
wide
voltage
window
(0–1.2
V)
provides
cyclic
performance
retention
97%
after
000
cycles
94%
self‐healing.
In
summary,
developed
exhibits
considerable
potential
high‐performance
energy
storage
device.
Sustainable Energy & Fuels,
Год журнала:
2023,
Номер
7(21), С. 5176 - 5197
Опубликована: Янв. 1, 2023
This
review
explores
the
potential
of
graphene
oxide
(GO)
in
enhancing
performance
and
energy
storage
capabilities
as
supercapacitors,
where
2D
GO
nanosheets
derived
from
pristine
graphite,
exhibit
remarkable
electrical
conductivity,
high
surface
area,
mechanical
strength.
