Bulletin of Taras Shevchenko National University of Kyiv Series Physics and Mathematics,
Journal Year:
2024,
Volume and Issue:
2, P. 89 - 95
Published: Jan. 1, 2024
The
paper
presents
the
results
of
studies
magneto-transport
properties
nanocarbon
structures
modified
on
surface
at
same
time
with
particles
transition
metals
nickel
and
iron.
Two
different
types
were
chosen
as
starting
materials
for
modification.
These
are
graphite
nanoplates
lateral
particle
sizes
up
to
10
μm,
obtained
by
sonication
thermally
exfoliated
during
several
hours
in
acetone,
multi-walled
carbon
nanotubes
a
diameter
40
nm.
modification
was
carried
out
method
metal
reduction
from
an
aqueous
solution
nitrate,
which
permeated
corresponding
particles.
As
result
modification,
uniform
distribution
obtained.
total
mass
concentration
60%.
Studies
structural
phase
composition
revealed
that
there
not
individual
granules
iron,
but
FeNi3
alloy
To
measure
resistance
magnetic
field,
bulk
samples
nanoplatelets
multiwalled
powders
produced
form
rectangular
parallelepipeds
cold
pressing
using
polyvinyl
acetate
(25%
mass)
binder.
Measurements
magnetoresistance
standard
four-probe
temperatures
293
K
77
transverse
longitudinal
orientation
sample
relative
external
field.
Conducted
experimental
layered
structures,
main
contribution
is
made
anisotropic
magnetoresistance,
characteristic
metals,
linear
occurs
systems
zero-band
gap
quasi-linear
dispersion
law.
For
nanotubes,
determined
mainly
spin-orbital
interaction
charge
carriers
moments
atoms
modifier
alloy.
Materials,
Journal Year:
2025,
Volume and Issue:
18(2), P. 456 - 456
Published: Jan. 20, 2025
The
development
of
carbon-based
supercapacitors
is
pivotal
for
advancing
high
energy
and
power
density
applications.
This
review
provides
a
comprehensive
analysis
structural
regulation
performance
enhancement
strategies
in
supercapacitors,
focusing
on
electrode
material
engineering.
Key
areas
explored
include
pore
structure
optimization,
heteroatom
doping,
intrinsic
defect
engineering,
surface/interface
modifications.
These
significantly
enhance
electrochemical
through
increasing
surface
area,
improving
conductivity,
facilitating
charge
transfer,
introducing
additional
pseudocapacitive
reactions,
optimizing
the
states
at
Fermi
level,
among
other
mechanisms.
After
these
fundamental
concepts,
details
various
preparation
methods
their
effects
supercapacitor
performance,
highlighting
interplay
between
properties.
Challenges
scaling
advanced
fabrication
techniques
ensuring
long-term
stability
functionalized
materials
are
discussed.
Additionally,
future
research
directions
proposed,
emphasizing
cost-effective,
scalable
interdisciplinary
approaches
to
design
next-generation
thereby
meeting
growing
demand
efficient
sustainable
storage
solutions.
Machines,
Journal Year:
2023,
Volume and Issue:
11(10), P. 977 - 977
Published: Oct. 22, 2023
With
the
increasing
utilization
of
portable
electronic
devices
and
wearable
technologies,
field
human
motion
energy
harvesting
has
gained
significant
attention.
These
have
potential
to
efficiently
convert
mechanical
generated
by
into
electrical
energy,
enabling
a
continuous
power
supply
for
low-power
devices.
This
paper
provides
an
overview
fundamental
principles
underlying
various
modes,
including
friction-based,
electromagnetic,
piezoelectric
mechanisms,
categorizes
existing
accordingly.
Furthermore,
this
study
conducts
comprehensive
analysis
key
techniques
in
harvesting,
such
as
mode
selection,
efficiency
enhancement,
miniaturized
design
devices,
evaluation
experiments.
It
also
compares
distinct
characteristics
different
modes.
Finally,
summarizes
challenges
faced
these
terms
integrating
biomechanics,
achieving
higher
efficiencies,
facilitating
micro-miniaturization,
composite
designs,
exploring
broader
applications.
Moreover,
it
offers
insights
future
development
technology,
laying
theoretical
framework
providing
reference
research
endeavors
field.
Micromachines,
Journal Year:
2025,
Volume and Issue:
16(2), P. 194 - 194
Published: Feb. 7, 2025
Lithium-ion
batteries
(LIBs)
have
become
integral
to
modern
technology,
powering
portable
electronics,
electric
vehicles,
and
renewable
energy
storage
systems.
This
document
explores
the
complexities
advancements
in
LIB
highlighting
fundamental
components
such
as
anodes,
cathodes,
electrolytes,
separators.
It
delves
into
critical
interplay
of
these
determining
battery
performance,
including
density,
cycling
stability,
safety.
Moreover,
addresses
significant
sustainability
challenges
posed
by
widespread
adoption
LIBs,
focusing
on
resource
depletion
environmental
impact.
Various
recycling
practices,
hydrometallurgy,
pyrometallurgy,
direct
recycling,
are
evaluated
for
their
efficiency
metal
recovery
ecological
footprint.
The
technologies
aim
mitigate
adverse
effects
waste,
emphasizing
need
sustainable
scalable
solutions.
research
underscores
importance
ongoing
innovation
electrode
materials
methodologies,
reminding
us
our
responsibility
commitment
finding
implementing
solutions,
this
continuous
improvement
is
crucial
enhance
safety,
ensuring
continued
relevance
evolving
landscape.
ChemSusChem,
Journal Year:
2024,
Volume and Issue:
17(20)
Published: May 10, 2024
Abstract
Carbon
materials
are
readily
available
and
essential
in
energy
storage.
One
of
the
routes
used
to
enhance
their
surface
area
activity
is
decoration
carbons
with
semiconductors,
such
as
amorphous
TiO
2
,
for
application
storage
devices.
Journal of Electrochemical Science and Technology,
Journal Year:
2023,
Volume and Issue:
15(1), P. 1 - 13
Published: June 29, 2023
<p>This
paper
presents
applications
of
lithium-sulfur
(Li-S)
energy
storage
batteries,
while
showing
merits
and
demerits
several
techniques
to
mitigate
their
electrochemical
challenges.
Unmanned
aerial
vehicles,
electric
cars,
grid-scale
systems
represent
main
Li-S
batteries
due
low
cost,
high
specific
capacity,
light
weight.
However,
polysulfide
shuttle
effects,
conductivities,
coulombic
efficiencies
signify
key
challenges
causing
volumetric
changes,
dendritic
growths,
limited
cycling
performances.
Solid-state
electrolytes,
interfacial
interlayers,
electrocatalysts
denote
promising
methods
such
Moreover,
nanomaterials
have
capability
improve
kinetic
reactions
based
on
properties
nanoparticles
immobilize
sulfur
in
cathodes,
stabilizing
lithium
anodes
controlling
growths.
technologies
are
able
satisfy
requirements
future
markets
for
advanced
rechargeable
with
high-power
densities
costs,
considering
environmentally
friendly
renewable
sources.</p>
