Nanotechnology,
Journal Year:
2023,
Volume and Issue:
34(41), P. 415401 - 415401
Published: July 4, 2023
The
aim
of
this
work
is
to
overcome
the
problem
agglomeration
and
volumetric
changes
observed
in
reduced
graphene
oxide
(rGO)
polyaniline
(PANI)
nanocomposites
responsible
for
inferior
capacitive
performance.
synergistic
effect
optimized
rGO,
PANI
tellurium
(Te)
ternary
nanocomposite
was
investigated
electrochemical
performances
energy
storage
devices.
For
purpose,
test
performed
at
low
molar
0.1M
H2SO4concentration
aqueous
electrolyte
a
two-electrode
cell
assembly.
studies
showed
that
specific
capacitance
564F
g-1is
attained
rGO/PANI
electrode
whose
performance
an
increase
by
adding
different
concentration
Te.
maximum
895
F
g-1at
10
mV
s-1was
rGO/PANI/Te50(GPT50)
with
negligible
charge
transfer
resistance,
knee
frequency
∼466.63
Hz,
response
time
∼17.39
s,
high
coulombic
efficiency
∼92%
power
densities
41Whkg-1and
3679Wkg-1with
cyclic
stability
∼91%
after
5000
GCCD
cycles
respectively.
result
material
indicated
combination
Te
rGO
can
be
used
enhance
supercapacitor
electrodes.
This
novel
composition
has
overall
improved
materials
thus
as
suitable
candidate
Applied Surface Science,
Journal Year:
2024,
Volume and Issue:
672, P. 160746 - 160746
Published: July 23, 2024
Transition
metals
are
known
for
their
enormous
potential
as
electrode
materials
supercapacitor
applications,
however
anhydrous
carbonate
minerals,
namely
Mn-carbonate,
and
Co-carbonate,
less
explored
exhibit
competitive
energy
storage
performance
compared
to
oxide
hydroxide
forms.
For
the
first
time,
MnCO3
(Rhodochrosite),
CoCO3
(Spherocobaltite)
MnCo
mixture
(Mn1-xCoxCO3)
were
synthesized
via
mechanochemistry
by
a
one-pot
approach
used
prepare
pseudocapacitive
electrochemical
storage.
In
this
work,
these
tested
in
alkaline
electrolyte,
morphological
structural
features
of
examined
using
SEM
(Scanning
Electron
Microscope),
Transmission
Microscopy
(TEM)
X-ray
Diffraction
(XRD).
The
surface
composition
was
studied
photoelectron
spectroscopy
(XPS).
After
milling,
microstructures
showed
an
increase
dislocations
microstrains
crystal
lattices
which
influenced
performance.
crystallinity
also
affected
grinding.
1
M
KOH
milled
evidenced
highest
specific
capacitance
(354.3
F/g
at
1.0
A/g),
while
CoCO3,
revealed
impressive
retention
94.8
%
after
20000
continuous
charge–discharge
cycles
10
A/g.
Interestingly,
composite
(Mn-Co)CO3
superior
rate
capability
(58.8
%)
enhanced
under
cycling
individual
cobalt
manganese
carbonates.
results
evidence
excellent
behavior
Mn
Co
carbonates
prepared
simple,
low-cost,
green
route
prove
electroactive
particularly
pseudocapacitors.
Applied Sciences,
Journal Year:
2023,
Volume and Issue:
13(10), P. 5844 - 5844
Published: May 9, 2023
The
hydrothermal
synthesis
of
a
hierarchically
organized
nanocomposite
based
on
nickel–cobalt
carbonate
hydroxide
hydrate
composition
M(CO3)0.5(OH)·0.11H2O
(where
M
is
Ni2+
and
Co2+)
layered
double
hydroxides
(NiCo-LDH)
was
studied.
Using
synchronous
thermal
analysis
(TGA/DSC),
it
determined
that
the
material
retained
stability
up
to
200
°C.
crystal
structure
powder
set
functional
groups
in
its
were
by
X-ray
diffraction
(XRD)
Fourier
transform
infrared
spectroscopy
(FTIR).
resulting
nanopowder
employed
as
ink
component
for
microplotter
printing
an
electrode
film,
which
array
miniature
planar
structures
with
diameter
about
140
μm,
surface
nickel-plated
steel
substrate.
scanning
electron
microscopy
(SEM),
established
main
area
“pixels”
represents
thin
film
individual
nanorods
periodic
inclusions
larger
spherical
formations.
According
atomic
force
(AFM)
data,
mean
square
roughness
28
nm.
electrochemical
properties
printed
composite
examined;
particular,
areal
specific
capacitance
at
different
current
densities
calculated,
kinetics
studied
impedance
spectroscopy.
It
found
under
study
exhibited
relatively
low
Rs
Rct
resistance,
indicates
active
ion
transfer
electrode/electrolyte
interface.
Journal of Statistical Mechanics Theory and Experiment,
Journal Year:
2024,
Volume and Issue:
2024(5), P. 053205 - 053205
Published: May 24, 2024
Abstract
We
suggest
a
coarse-grained
water
model
for
use
in
classical
density
functional
theory
(cDFT)
to
describe
aqueous
inorganic
salt
solutions
that
act
as
working
electrolytes
electrical
double-layer
capacitors
(EDLCs)
with
electrodes
comprising
two
face-to-face
doped
carbon
monolayers.
Focus
of
the
cDFT
calculations
lies
on
influence
solvent
electrode
wettability
(SEW)
capacitance
and
energy
storage
behaviors,
while
also
considering
its
interaction
factors
like
electrolyte
bulk
concentration,
pore
size,
voltage,
temperature.
New
phenomena
are
disclosed
theoretically.
Remarkably,
this
study
challenges
traditional
notion
is
consistently
boosted
by
enhancing
electrode’s
ionophobicity.
Contrarily,
SEW
effect
reduces
below
standard
electrochemical
window
voltage
(around
1.2
V)
only
enhances
surpasses
certain
threshold
up
optimal
(2
V–2.5
V).
Furthermore,
non-monotonic
demonstrated
under
appropriate
conditions,
shedding
new
light
complex
relationship
between
ionophobicity
storage.
Moreover,
present
enables
prediction
experimentally
observed
inverse
temperature
capacitance.
In
contrast,
widely
used
primitive
predicts
existence
maximum
value.
The
decisive
factor
impact
identified
congestion
within
pore,
other
contribute
affecting
congestion.
research
offers
valuable
insights,
highlighting
significance
innovative
strategic
design
EDLC
devices.
