Chemistry of Materials,
Год журнала:
2023,
Номер
35(4), С. 1594 - 1600
Опубликована: Фев. 13, 2023
Sunlight-driven
photocatalytic
water
purification
for
the
removal
of
persistent
organic
compounds
and
microorganisms
has
been
widely
regarded
as
a
promising
technology
due
to
low
energy
consumption
environmental
friendliness;
however,
it
calls
efficient
sustainable
photocatalysts.
Pyrylium
cation
is
photoactive
component
many
naturally
occurring
dyes
in
fruits,
flowers,
leaves.
Herein,
we
report
synthesis
novel
pyrylium
contained
vinylene-linked
two-dimensional
covalent
framework
(v-2D-COF-O1)
via
aldol-type
polycondensation.
The
resultant
v-2D-COF-O1
narrow
band
gap
(1.15
eV)
wide-range
light
absorption
up
∼920
nm.
More
importantly,
can
activate
molecular
oxygen
generate
highly
reactive
species
including
superoxide
(•O2–)
hydroxyl
radicals
(•OH)
under
simulated
sunlight
(AM
1.5
G),
which
leads
remarkable
activities
both
waste
decomposition
disinfection.
These
results
suggest
potential
v-2D-COFs
high-performance
photocatalysts
purification.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(2), С. 1318 - 1325
Опубликована: Янв. 5, 2024
Sp2-carbon-conjugated
covalent
organic
frameworks
(sp2c-COFs)
have
emerged
as
promising
platforms
for
phototo–chemical
energy
conversion
due
to
their
tailorable
optoelectronic
properties,
in-plane
π-conjugations,
and
robust
structures.
However,
the
development
of
sp2c-COFs
in
photocatalysis
is
still
highly
hindered
by
limited
linkage
chemistry.
Herein,
we
report
a
novel
thiadiazole-bridged
sp2c-COF
(sp2c-COF-ST)
synthesized
thiadiazole-mediated
aldol-type
polycondensation.
The
resultant
sp2c-COF-ST
demonstrates
high
chemical
stability
under
strong
acids
bases
(12
M
HCl
or
12
NaOH).
electro-deficient
thiadiazole
together
with
fully
conjugated
planar
skeleton
endows
superior
photoelectrochemical
performance
charge-carrier
separation
migration
ability.
As
result,
when
employed
photocathode,
exhibits
significant
photocurrent
up
∼14.5
μA
cm–2
at
0.3
V
vs
reversible
hydrogen
electrode
(RHE)
visible-light
irradiation
(>420
nm),
which
much
higher
than
those
analogous
COFs
partial
imine
linkages
(mix-COF-SNT
∼
9.5
cm–2)
full
(imi-COF-SNNT
4.9
cm–2),
emphasizing
importance
structure–property
relationships.
Further
temperature-dependent
photoluminescence
spectra
density
functional
theory
calculations
demonstrate
that
has
smaller
exciton
binding
well
effective
mass
comparison
mix-COF-SNT
imi-COF-SNNT,
suggests
sp2c-conjugated
enhances
dissociation
carrier
light
irradiation.
This
work
highlights
design
preparation
photocatalytic
performance.
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(36)
Опубликована: Май 8, 2023
Abstract
Facing
the
energy
crisis,
using
salinity
gradient
between
seawater
and
freshwater
for
osmotic
conversion
is
a
direct
way
to
obtain
energy.
So
far,
most
nanofluidic
membranes
utilized
generation
are
cation‐selective.
Given
that
both
anion‐
cation‐selective
have
identical
importance
devices,
it
of
great
significance
develop
anion‐selective
membranes.
Herein,
an
membrane
synthesized
by
in
situ
growth
imine‐bridged
covalent
organic
framework
(COF)
on
ordered
anodic
aluminum
oxide
(AAO)
at
room
temperature.
The
imine
groups
residual
amino
COF
can
combine
with
protons
neutral
solution,
enabling
positively
charged
efficiently
transport
anions.
Particularly,
due
asymmetry
charge
structure
COF/AAO,
as‐prepared
exhibits
excellent
ionic
current
rectification
property,
which
inhibit
ion
concentration
polarization
effectively
possess
high
selectivity
permeability.
Using
present
COF/AAO
membrane,
be
successfully
harvested
from
solutions
salt
content,
output
power
density
reached
17.95W
m
−2
under
500‐fold
gradient.
study
provides
new
avenue
construction
application
smart
efficient
conversion.
Proceedings of the National Academy of Sciences,
Год журнала:
2024,
Номер
121(8)
Опубликована: Фев. 13, 2024
Understanding
the
molecular-level
mechanisms
involved
in
transmembrane
ion
selectivity
is
essential
for
optimizing
membrane
separation
performance.
In
this
study,
we
reveal
our
observations
regarding
behavior
of
Li
+
and
Mg
2+
ions
as
a
response
to
changing
pore
solvation
abilities
covalent-organic-framework
(COF)
membranes.
These
were
manipulated
by
adjusting
lengths
oligoether
segments
attached
channels.
Through
comparative
experiments,
able
unravel
relationships
between
ability
various
transport
properties,
such
partitioning,
conduction,
selectivity.
We
also
emphasize
significance
competition
with
solvating
modulating
found
that
increasing
length
chain
facilitated
transport;
however,
it
was
COF
chains
containing
two
ethylene
oxide
units
exhibited
most
pronounced
discrepancy
energy
barrier
,
resulting
highest
factor
among
all
evaluated
Remarkably,
under
electro-driven
binary-salt
conditions,
specific
achieved
an
exceptional
/Mg
up
1352,
making
one
effective
membranes
available
separation.
The
insights
gained
from
study
significantly
contribute
advancing
understanding
selective
within
confined
nanospaces
provide
valuable
design
principles
developing
highly
Chemical Society Reviews,
Год журнала:
2024,
Номер
53(5), С. 2300 - 2325
Опубликована: Янв. 1, 2024
Bioinspired
2D
nanofluidic
membranes
enable
efficient
and
selective
ion
transport.
Further
research
in
this
area
is
essential
to
facilitate
the
development
of
high-performance
energy
conversion
storage
devices
for
a
sustainable
future.
Advanced Materials,
Год журнала:
2024,
Номер
36(35)
Опубликована: Июнь 22, 2024
Osmotic
energy,
often
referred
to
as
"blue
energy",
is
the
energy
generated
from
mixing
of
solutions
with
different
salt
concentrations,
offering
a
vast,
renewable,
and
environmentally
friendly
resource.
The
efficacy
osmotic
power
production
considerably
relies
on
performance
transmembrane
process,
which
depends
ionic
conductivity
capability
differentiate
between
positive
negative
ions.
Recent
advancements
have
led
development
membrane
materials
featuring
precisely
tailored
ion
transport
nanochannels,
enabling
high-efficiency
harvesting.
In
this
review,
diffusion
in
confined
nanochannels
rational
design
optimization
architecture
are
explored.
Furthermore,
structural
mitigate
resistance
concentration
polarization
effect
for
enhancing
harvesting
highlighted.
Finally,
an
outlook
challenges
that
lie
ahead
provided,
potential
applications
conversion
outlined.
This
review
offers
comprehensive
viewpoint
evolving
prospects
conversion.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(29), С. 19680 - 19685
Опубликована: Июль 9, 2024
The
pore
shapes
of
two-dimensional
covalent
organic
frameworks
(2D
COFs)
significantly
limit
their
practical
applications
in
separation
and
catalysis.
Although
various
2D
COFs
with
polygonal
pores
have
been
well
developed,
constructing
pentagonal
remains
an
enormous
challenge.
In
this
work,
we
developed
one
kind
the
