Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(45)
Published: July 23, 2024
Abstract
Ionic
diode‐based
generators
show
great
superiority
in
harvesting
low‐frequency
mechanical
energy
from
human
motions
for
various
wearable
applications.
The
major
challenge
is
to
improve
their
extremely
limited
output
voltage
the
miniaturization/simplicity
of
ionic
self‐powered
devices
as
well
further
improvement
mechanoelectric
conversion
performance.
Herein,
construction
gradient
polycation/polyanion
heterojunction
demonstrated
vastly
boost
voltage,
energy‐harvesting
efficiency,
and
sensing
performance
diode.
Besides
an
inherent
potential
at
polyanion/polycation
interface,
additional
transmembrane
potentials
can
be
generated
across
polyanion
polycation
conductors
diodes
due
charge
distribution.
Consequently,
produce
much
higher
(306.53
mV)
than
previously
reported
homogeneous
ones
(4.1–135
mV).
Meanwhile,
high
imparts
generator
with
ultrahigh
power
density
(50.16
µW
cm
−
2
or
250.8
−3
)
pressure‐perception
sensitivity
(43582
mV/MPa),
which
are
dramatically
increased
by
162.76%
128.71%,
respectively,
compare
those
one.
Impressively,
resulting
generate
ultralarge
current
(≈0.52
mA
−2
ultralong
discharge
time
(>400
s),
thus
enabling
continuous
generation
under
pressure
implantable
Langmuir,
Journal Year:
2023,
Volume and Issue:
40(1), P. 1058 - 1071
Published: Dec. 26, 2023
To
investigate
the
application
of
modified
hexagonal
boron
nitride
(h-BN)
in
detection
and
monitoring
harmful
gases
(NO2,
NO,
NH3,
CO),
first-principles
calculations
are
applied
to
study
geometric
structure
electronic
behavior
adsorption
system.
In
this
paper,
four
sites,
namely,
B,
N,
bridge,
hollow
considered
explore
stable
metals
(M
=
Rh,
Pd,
Ag,
Ir,
Pt,
Au)
on
BN
surface.
The
calculation
results
demonstrate
that
structures
metal
at
N-site
relatively
stable.
Subsequently,
different
NO2,
CO
M-BN
researched.
electron
transfer,
charge
difference
density,
work
function
calculated.
show
have
strongest
capacity
Ir-BN
system,
with
energies
−2.705,
−5.064,
−3.757
eV,
respectively.
Pt-BN
system
has
an
excellent
performance
(−2.251
eV)
for
NH3.
Compared
increases
after
adsorbing
while
it
decreases
This
shows
h-BN
modification
is
a
potential
material
online
gases.
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 30, 2024
Abstract
2D
nanomaterials
have
triggered
widespread
attention
in
sensing
applications.
Especially
for
layered
metal
chalcogenides
(LMCs),
the
unique
semiconducting
properties
and
high
surface
area
endow
them
with
great
potential
gas
sensors.
The
assembly
of
LMCs
guest
species
is
an
effective
functionalization
method
to
produce
synergistic
effects
hybridization
greatly
enhancing
gas‐sensing
properties.
This
review
starts
synthetic
techniques,
properties,
principles,
then
comprehensively
compiles
advanced
achievements
pristine
Key
advances
development
are
categorized
according
spatial
architectures.
It
systematically
discussed
three
aspects:
surface,
lattice,
interlayer,
comprehend
benefits
functionalized
from
chemical
effect,
electronic
structure
features.
challenges
outlooks
developing
high‐performance
LMCs‐based
sensors
also
proposed.
