ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(44), С. 61004 - 61015
Опубликована: Окт. 24, 2024
High-frequency,
high-power,
and
high-speed
telecommunication
in
a
complex
environment
promotes
the
development
of
dielectric
materials
toward
low
constant,
loss,
good
thermal
properties,
long-term
reliability.
Here,
polyimide/polytetrafluoroethylene
(PI/PTFE)
nanofiber
membranes
with
an
inherent
super
hydrophobicity,
excellent
stability,
enhanced
tensile
strength
were
prepared
via
simple
electrospinning
strategy
imidization
reaction.
The
obtained
PI/PTFE
demonstrate
superlow
average
constant
1.22–1.27
loss
0.032–0.048
high
frequency,
together
strength,
benefiting
from
special
nanofiber-bead
structure
formed
composite
membrane.
mixing
polyamic
acid
(PAA)
PTFE
solution
endows
membrane
uniform
distribution
thus
superhydrophobicity
water
contact
angle
156.1
159.2°
for
PI/PTFE-30%
PI/PTFE-40%,
respectively.
Besides,
hydrophobicity
could
be
kept
even
after
standing
more
than
10,000
drops,
properties
exhibited
promising
results
Tmax
=
587
°C
Td5%
423
°C,
rendering
these
favorable
alternatives
prospective
telecommunication.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Июль 13, 2024
Abstract
Controlling
the
concentrations
of
H
2
O
and
CO
at
reaction
interface
is
crucial
for
achieving
efficient
electrochemical
reduction.
However,
precise
control
these
variables
during
catalysis
remains
challenging,
underlying
mechanisms
are
not
fully
understood.
Herein,
guided
by
a
multi-physics
model,
we
demonstrate
that
tuning
local
O/CO
achievable
thin
polymer
coatings
on
catalyst
surface.
Beyond
often-explored
hydrophobicity,
properties
gas
permeability
water-uptake
ability
even
more
critical
this
purpose.
With
insights,
achieve
reduction
copper
with
Faradaic
efficiency
exceeding
87%
towards
multi-carbon
products
high
current
density
−2
A
cm
.
Encouraging
cathodic
energy
(>50%)
also
observed
due
to
substantially
reduced
potential.
Additionally,
stable
over
150
h
practically
relevant
densities
owning
robust
interface.
Moreover,
strategy
has
been
extended
membrane
electrode
assemblies
other
catalysts
Our
findings
underscore
significance
fine-tuning
balance
future
applications.
Advanced Energy Materials,
Год журнала:
2023,
Номер
13(15)
Опубликована: Март 9, 2023
Abstract
The
benefits
of
covalent
grafting
fluorine
atoms
onto
carbonaceous
materials
are
described
for
the
design
new
electrocatalysts
low‐temperature
fuel
cells.
In
order
to
obtain
best
results,
fluorination
conditions
must
be
carefully
chosen
according
physicochemical
properties
starting
(specific
surface
area,
pore
size
distribution,
crystallinity,
and
doping).
By
describing
main
routes,
article
aims
help
in
choice
efficient
treatment
conditions.
effects
on
performance
platinum
group
metal
(PGM)‐based
catalyst
non‐PGM‐based
electrocatalyst
discussed.
Finally,
future
research
prospects
technical
challenges
cells
proposed.
TrAC Trends in Analytical Chemistry,
Год журнала:
2024,
Номер
173, С. 117651 - 117651
Опубликована: Март 12, 2024
Polymeric
porous
membranes
have
proven
to
be
a
versatile
and
efficient
material
for
microextraction
processes.
In
analytical
practice,
they
are
used
both
as
solid
support
protective
medium
improved
sample
preparation
in
various
applications.
offer
unique
advantages
due
their
large
surface
area
controllable
pore
size,
eliminating
interfering
effects
from
complex
matrices
improving
the
selectivity
of
analysis.
This
review
summarizes
key
aspects
application
polymeric
liquid-
solid-phase
microextraction,
addresses
challenges
advances
implementation
chemical
analysis
food,
biological
environmental
samples.
The
novel
view
into
include
greenness
assessment
methods
synthesis
well
solvents
applied
during
technological
process.
