Sensors,
Journal Year:
2024,
Volume and Issue:
24(23), P. 7629 - 7629
Published: Nov. 28, 2024
This
paper
experimentally
examines
the
influence
of
hybrid
excitation
on
performance
vibrational
piezoelectric
energy
harvesting
systems
a
bluff
body
with
variable
cross
section
along
its
generatrix.
A
combination
from
shaker
and
airflow
is
considered
source
which
harvested.
Varied
frequencies
velocities
across
five
different
masses
were
considered,
each
defining
natural
frequency
system.
The
system's
in
excitation,
enhancements
harvesting,
challenges
these
was
observed,
helping
to
determine
optimal
operating
conditions
function
effectively
ambient
environments.
tests
identified
ranges
within
maximized
responses
observed.
Next,
computational
fluid
dynamic
(CFD)
simulations
carried
out
understand
impact
circular
square
sections
controlling
nature
representative
wide
range
that
may
be
utilized
for
such
purposes.
analyses
helped
contextualize
opportunities
limitations
use
understanding
if
transition
one
another
can
lead
an
assimilation
advantages
observed
using
independently.
Advanced Materials Technologies,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 17, 2025
Abstract
As
global
energy
demands
increase,
reliance
on
fossil
fuels
intensifies
environmental
and
resource
pressures,
driving
the
exploration
of
renewable
sources.
With
its
high
density
potential
to
meet
needs,
wave
attracts
significant
attention.
Despite
abundance
resources,
efficiently
harvesting
multi‐directional
remains
challenging.
This
study
introduces
a
gravity‐switch‐triggered
triboelectric
nanogenerator
(GS‐TENG)
designed
enhance
efficiency
collection.
The
GS‐TENG
uses
gravity
switch
control
circuit
connections
disconnections,
optimizing
internal
structure
experimentally
adjusting
number
nylon
balls
output
performance.
In
experiments,
demonstrated
adaptability
various
directions
achieved
short‐circuit
current
22.2
µA,
an
open‐circuit
voltage
196
V,
transferred
charge
75
nC
under
specific
conditions.
showcases
superior
performance
in
low‐frequency
Additionally,
device
successfully
lit
100
LEDs
simulated
environment,
validating
for
practical
applications.
research
provides
effective
approach
lays
theoretical
experimental
foundations
further
development
collection
technologies.
Energies,
Journal Year:
2025,
Volume and Issue:
18(6), P. 1502 - 1502
Published: March 18, 2025
With
the
increasing
global
emphasis
on
sustainable
energy,
wave
energy
has
gained
recognition
as
a
significant
renewable
marine
resource,
drawing
substantial
research
attention.
However,
efficient
conversion
of
low-frequency,
random,
and
low-energy
motion
into
electrical
power
remains
considerable
challenge.
In
this
study,
an
advanced
hybrid
generator
design
is
introduced
which
enhances
harvesting
by
optimizing
wave–body
coupling
characteristics
incorporating
both
triboelectric
nanogenerator
(TENG)
electromagnetic
(EMG)
within
shell.
The
optimized
asymmetric
trapezoidal
shell
(ATS)
improves
output
frequency
efficiency
in
environments.
Experimental
findings
under
simulated
water
excitation
indicate
that
accelerations
x,
y,
z
directions
for
ATS
are
1.9
m·s−2,
0.5
1.4
respectively,
representing
1.2,
5.5,
2.3
times
those
observed
cubic
Under
real
ocean
conditions,
single
TENG
unit
embedded
achieves
maximum
transferred
charge
1.54
μC,
short-circuit
current
103
μA,
open-circuit
voltage
363
V,
surpassing
factors
1.21,
1.24,
2.13,
respectively.
These
performance
metrics
closely
align
with
obtained
six-degree-of-freedom
platform
oscillation
(0.4
Hz,
swing
angle
range
±6°),
exceeding
results
laboratory-simulated
waves.
Notably,
most
probable
along
x-axis
reaches
0.94
Hz
trials,
1.94
ambient
sea
integrated
efficiently
captures
low-quality
to
quality
sensors
This
study
highlights
potential
combining
synergistic
geometric
integration
achieve
high-performance
through
improved
coupling.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: June 2, 2025
Abstract
Triboelectric
nanogenerator
(TENG)
is
burgeoning
as
both
a
promising
energy
harvester
and
self‐powered
sensor.
However,
the
mechanical
strength,
flexibility,
overall
functionality
of
TENGs
are
irreversibly
impacted
by
chemical
physical
changes
polymer
at
high
temperatures.
Here,
core–shell
structured
expanded‐perlite@graphene
particles
conveniently
synthesized
high‐temperature
carbonization
reaction,
which
then
introduced
into
polydimethylsiloxane
(PDMS)
to
form
robust
composite
foam
(EPGP)
with
excellent
thermal
insulation
flame
retardancy.
The
resistance
EPGP
(0.0145
m
2
K
W
−1
)
≈2.1
times
that
PDMS,
while
reducing
heat/smoke
release
rates
84%/44%
total
44%/76%.
For
conversion
sensing,
EPGP‐based
TENG
shows
186
V
open‐circuit
voltage
0.3
µA
cm
−2
short‐circuit
current
room
temperature,
2.7
3.2
higher
than
PDMS‐based
TENG.
Even
200
°C,
output
also
remains
stable
106
0.16
.
as‐designed
in
monitoring
engine's
malfunction/compressor
operation
high‐temperatures
extended
periods
realized
detecting
abnormal
vibrations.
instant
engine
status
graphically
performance
degradation,
thus
functioning
new
indicator
informs
fault
driving,
advancing
thermal‐insulation
composites
for
TENG‐based
microelectronics
extreme
environments.
