Achieving ultrahigh power factor in Mg 3(Sb,Bi) 2-based thermoelectric alloys sintered by introducing elemental Mg and W
Journal of Advanced Ceramics,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Improving
the
power
factor
(PF)
of
thermoelectric
materials
is
crucial
for
enhancing
output
density
and
broadening
practical
applications.
The
near-room-temperature
electrical
performance
Mg3(Sb,Bi)2-based
alloys
hindered
due
to
presence
Mg
vacancies
grain
boundary
scattering,
resulting
in
lower
factor.
Herein,
we
introduced
an
excess
into
Mg3(Sb,Bi)2
alloy
during
hot-pressing
process,
triggering
a
liquid
phase
sintering
which
can
effectively
fill
increase
average
size
significantly
reduce
scattering.
This
leads
enhanced
room-temperature
conductivity
(σ)
without
detrimental
effects
on
Seebeck
coefficient
(S),
thus
yielding
high
PF
~25.3
μW
cm-1
K-2
figure
merit
(ZT)
~
1.03
within
temperature
range
323‒623
K.
Moreover,
different
amounts
W
were
further
added,
density-functional
theory
(DFT)
calculations
reveal
that
segregation
at
boundaries
reduces
interfacial
potential
barriers,
leading
improved
S
σ.
Consequently,
ultrahigh
~26.2
was
attained
W0.06Mg3.2Sb1.5Bi0.49Te0.01–4%Mg
alloys.
Additionally,
mechanical
properties
(Vickers
hardness
fracture
toughness)
also
compared
with
pristine
alloy.
dual-modified
approach
boost
TE
stability,
advancing
Язык: Английский
Self-Powered Thermoelectric Hydrogels Accelerate Wound Healing
ACS Nano,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 16, 2025
Electrical
stimulation
(ES)
serves
as
a
biological
cue
that
regulates
critical
cellular
processes,
including
proliferation
and
migration,
offering
an
effective
approach
to
accelerating
wound
healing.
Thermoelectrics,
capable
of
generating
electricity
by
exploiting
the
temperature
difference
between
skin
surrounding
environment
without
external
energy
input,
present
promising
avenue
for
ES-based
therapies.
Herein,
we
developed
Ag2Se@gelatin
methacrylate
(Ag2Se@GelMA)
thermoelectric
hydrogels
with
high
room-temperature
performance
employed
them
self-powered
ES
devices
repair.
Systematic
in
vivo
vitro
investigations
elucidated
their
mechanisms
enhancing
Our
findings
reveal
Ag2Se@GelMA
can
significantly
accelerate
closure
amplifying
endogenous
electric
field,
thereby
promoting
cell
proliferation,
angiogenesis.
Comprehensive
experiments
demonstrated
generated
activates
voltage-gated
calcium
ion
channels,
elevating
intracellular
Ca2+
levels
mitochondrial
functions
through
Ca2+/CaMKKβ/AMPK/Nrf2
pathway.
This
cascade
improves
dynamics
angiogenesis,
tissue
regeneration.
The
newly
represent
marked
progress
dressing
technology
potential
improve
clinical
strategies
engineering
regenerative
medicine.
Язык: Английский