Research Square (Research Square),
Journal Year:
2023,
Volume and Issue:
unknown
Published: Oct. 12, 2023
Abstract
Hydrogen-bonded
organic
frameworks
(HOFs)
are
versatile
materials
with
potential
applications
in
proton
conduction.
Traditional
approaches
involve
incorporating
humidity
control
to
address
grain
boundary
challenges
for
This
study
finds
vitrification
as
an
alternative
strategy
eliminate
effect
HOFs
by
rapidly
melt
quenching
the
kinetically
stable
glassy
state
HOF-SXU-8-g
.
Notably,
a
remarkable
enhancement
conductivity
without
was
achieved
after
vitrification,
from
1.31
×
10
-7
S
cm
-1
5.62
-2
at
100°C.
Long
term
stability
test
showed
negligible
performance
degradation,
and
even
30°C,
remained
high
level
of
1.2
Molecule
dynamics
(MD)
simulations
X-ray
total
scattering
experiments
reveal
system
is
consisted
three
kinds
clusters,
i.e.,
1,5-Naphthalenedisulfonic
acid
(1,5-NSA)
anion
N,N-dimethylformamide
molecule
H
+
-H
2
O
clusters.
In
which,
plays
important
role
bridge
these
clusters
mainly
related
H+
on
3
1
magic
angle
spinning
(MAS)
solid-state
nuclear
magnetic
resonance
(NMR)
revealed
that
mobility
increased
significantly
transformation.
These
findings
provide
valuable
insights
optimizing
HOFs,
enabling
efficient
conduction,
advancing
energy
conversion
storage
devices.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: May 10, 2024
Abstract
Hydrogen-bonded
organic
frameworks
(HOFs)
are
versatile
materials
with
potential
applications
in
proton
conduction.
Traditional
approaches
involve
incorporating
humidity
control
to
address
grain
boundary
challenges
for
This
study
finds
vitrification
as
an
alternative
strategy
eliminate
effect
HOFs
by
rapidly
melt
quenching
the
kinetically
stable
HOF-SXU-8
glassy
state
HOF-g
.
Notably,
a
remarkable
enhancement
conductivity
without
was
achieved
after
vitrification,
from
1.31
×
10
−7
S
cm
−1
5.62×
−2
at
100
°C.
Long
term
stability
test
showed
negligible
performance
degradation,
and
even
30
°C,
remained
high
level
of
1.2
Molecule
dynamics
(MD)
simulations
X-ray
total
scattering
experiments
reveal
system
is
consisted
three
kinds
clusters,
i.e.,
1,5-Naphthalenedisulfonic
acid
(1,5-NSA)
anion
N,N-dimethylformamide
(DMF)
molecule
H
+
-H
2
O
clusters.
In
which,
plays
important
role
bridge
these
clusters
mainly
related
on
3
These
findings
provide
valuable
insights
optimizing
HOFs,
enabling
efficient
conduction,
advancing
energy
conversion
storage
devices.
Inorganic Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 5, 2025
Although
there
has
been
some
recent
interest
in
the
proton
conductivity
(σ)
of
highly
stable
carboxyl
metal–organic
frameworks
(MOFs)
made
tetravalent
metal
ions,
given
their
potential
applications
fuel
cells
and
electrochemical
sensing,
research
on
MOFs
constructed
by
hafnium(IV)
ions
needs
to
be
expanded
significantly.
Based
this,
we
used
two
common
easily
prepared
phenylpoly(carboxylic
acid)
ligands,
1,2,4-phenyltricarboxylic
acid
1,2,4,5-phenyltetracarboxylic
acid,
react
with
hafnium
tetrachloride,
respectively,
creating
porous
hafnium(IV)-based
MOFs,
UiO-66-COOH-Hf
(1)
UiO-66-(COOH)2-Hf
(2),
same
structure
as
UiO-66-Hf
but
different
numbers
free
carboxylic
groups.
A
series
stability
assays
revealed
that
had
excellent
structural
rigidity,
including
thermal
water
stability.
More
crucially,
alternating
current
impedance
experiments
demonstrate
σ
varies
positively
humidity
temperature,
reaching
up
10–3
S·cm–1
(1:
2.83
×
2:
4.35
S·cm–1)
under
right
conditions
(98%
relative
100
°C).
The
latter
roughly
doubles
former,
which
is
due
difference
number
groups,
confirmed
analysis
conduction
mechanism
investigation.
high
intrinsic
lays
a
solid
foundation
for
future
application
affords
new
inspiration
developing
high-performance
proton-conductive
materials.
Inorganic Chemistry,
Journal Year:
2023,
Volume and Issue:
62(51), P. 21309 - 21321
Published: Dec. 13, 2023
In
the
field
of
proton
conduction,
acquisition
crystalline
metal-organic
frameworks
(MOFs)
with
high
stability
and
ultrahigh
conductivity
has
been
great
research
value
is
worth
continuous
exploration.
Here,
we
greenly
synthesized
a
three-dimensional
porous
MOF
(MOF-801-Ce)
by
using
[(NH4)2Ce(NO3)6
fumaric
acid
as
starting
materials
solvothermally
Hf-UiO-66-NO2
HfCl4
2-nitroterephthalic
materials.
A
series
measurements
have
shown
that
both
MOFs
exhibit
good
water
stability,
acid-base
thermal
demonstrate
outstanding
conductivity.
At
100
°C
98%
relative
humidity
(RH),
conductivities
(σ)
could
be
2.59
×
10-3
S·cm-1
for
MOF-801-Ce
0.89
Hf-UiO-66-NO2.
To
pursue
higher
conductivity,
further
adopted
evaporation
approach
to
encapsulate
imidazole
molecules
in
pores
two
compounds,
achieving
imidazole-encapsulated
MOFs,
Im@MOF-801-Ce
Im@Hf-UiO-66-NO2.
As
expected,
their
σ
values
were
significantly
boosted
almost
an
order
magnitude
up
10-2
S·cm-1.
Finally,
proton-conductive
mechanisms
explored
light
structural
information,
gas
adsorption/desorption,
other
tests.
The
these
durability
conduction
capability
manifested
they
promise
electrochemical
fields.
