ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
6(21), С. 13217 - 13227
Опубликована: Окт. 21, 2024
This
study
investigates
the
impact
of
alkyl
side
chain
length
on
structural
organization
and
proton
conductivity
sulfonated
polyimide
(SPI)
thin
films.
SPIs
with
different
lengths
CX
(X:
number
carbon
atoms
at
chain,
X
=
0,
3,
6,
10)
were
synthesized,
relationship
between
molecular
architecture
transport
properties
was
investigated.
In
all
SPIs,
polymer
backbone
oriented
parallel
to
substrate,
lamellar
structures
confirmed,
spacing
increasing
linearly
length.
Water
uptake
behavior
varied
significantly,
where
C0
film
exhibited
highest
water
lower
humidity
while
C3
achieved
higher
under
high
humidity,
reaching
1.8
×
10–1
S
cm–1
298
K
95%
relative
(RH)
an
activation
energy
0.18
eV
90%
RH.
Conversely,
extending
led
insolubility
in
C10.
As
a
result,
exchange
membrane
system
chemical/water
stability
constructed.
These
findings
provide
critical
insights
into
designing
advanced
proton-conducting
materials
optimizing
their
performance
for
fuel
cells
other
electrochemical
devices.
Energies,
Год журнала:
2024,
Номер
17(9), С. 2029 - 2029
Опубликована: Апрель 25, 2024
Based
on
the
previous
work
conducted
by
Fujii
et
al.,
NdBaInO4
compounds
present
modest
oxide-ion
conductivities.
Therefore,
it
has
been
an
attractive
system
of
significant
interest.
In
this
study,
we
attempted
to
partially
substitute
Ca
for
Nd
and
total
electrical
conductivity
was
successfully
improved
due
generation
oxygen
vacancies.
The
synthesis,
crystal
structure,
density,
surface
topography,
properties
Ca-doped
have
studied,
respectively.
10%
20%
molar
fractions
were
synthesized
through
solid-state
reactions.
structure
them
obtained
from
Le
Bail
refinement
XRD
pattern,
giving
result
monoclinic
which
belongs
P21/c
space
group.
highest
4.91
×
10−3
S
cm−1
in
Nd0.9Ca0.1BaInO3.95
sample
at
a
temperature
760
°C
dry
atmosphere
activation
energy
reduced
0.68
eV
0.58
when
above
464
(737
K)
after
doping
with
0.1
fraction
Ca2+.
Moreover,
wet
moderate
relatively
higher
than
that
atmosphere,
suggests
potential
proton
conduction
may
exist
atmospheres.
addition,
diffusion
coefficients
(D*
=
1.82
10−8
cm2/s,
850
°C)
about
two
times
Nd0.8Ca0.2BaInO3.90
7.95
10−9
increased
significantly
orders
magnitude
compared
coefficient
undoped
8.25
10−11
°C).
Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Июнь 6, 2024
Abstract
Proton
conduction
is
important
in
both
fundamental
research
and
technological
development.
Here
we
report
designed
synthesis
of
crystalline
porous
covalent
organic
frameworks
as
a
new
platform
for
high‐rate
anhydrous
proton
conduction.
By
developing
nanochannels
with
different
topologies
pathways
loading
neat
phosphoric
acid
to
construct
robust
carrier
networks
the
pores,
found
that
pore
topology
crucial
Its
effect
on
increasing
conductivity
an
exponential
mode
other
than
linear
fashion,
endowing
materials
exceptional
conductivities
exceeding
10
−2
S
cm
−1
over
broad
range
temperature
low
activation
energy
barrier
down
0.24
eV.
Remarkably,
size
controls
mechanism,
where
mesopores
promote
via
fast‐hopping
while
micropores
follow
sluggish
vehicle
process.
Notably,
decreasing
content
drastically
reduces
greatly
increases
barrier,
emphasizing
pivotal
role
well‐developed
network
transport.
These
findings
insights
unveil
general
transformative
guidance
designing
framework
systems
ion
conduction,
storage,
conversion.
