Angewandte Chemie International Edition,
Journal Year:
2022,
Volume and Issue:
61(42)
Published: Sept. 6, 2022
Designing
materials
with
high
triboelectric
is
an
efficient
way
of
improving
output
performance
nanogenerators
(TENGs).
Herein,
we
synthesized
a
series
covalent
organic
frameworks
(COFs)
similar
skeletons
but
various
functional
groups
ranging
between
electron-donating
and
electron-withdrawing.
These
COFs
form
ideal
platform
for
clarifying
the
contribution
each
group
to
TENG
because
pore
wall
perturbed
in
predesigned
manner.
Kelvin
probe
force
microscopy
computational
data
suggest
that
surface
potentials
electron
affinities
can
be
improved
by
introducing
or
withdrawing
groups,
highest
values
observed
fluorinated
COF.
The
COF
delivered
voltage
current
420
V
64
μA,
respectively,
which
are
comparable
other
reported
materials.
This
strategy
used
efficiently
screen
suitable
as
excellent
performance.
Nature Communications,
Journal Year:
2022,
Volume and Issue:
13(1)
Published: Oct. 1, 2022
Abstract
Covalent
organic
frameworks
(COFs)
have
constituted
an
emerging
class
of
photocatalysts
showing
enormous
potential
for
visible
photocatalytic
H
2
evolution
from
water.
However,
suffering
sluggish
reaction
kinetics,
COFs
often
cooperate
with
precious
metal
co-catalysts
essential
proton-reducing
capability.
Here,
we
synthesize
a
chiral
β-ketoenamine-linked
COF
coordinated
10.51
wt%
atomically
dispersed
Cu(II)
as
electron
transfer
mediator.
The
enantioselective
combination
the
COF-Cu(II)
skeleton
L-/D-cysteine
sacrificial
donors
remarkably
strengthens
hole
extraction
and
in
turn,
photoinduced
electrons
accumulate
rapidly
via
Cu
ions.
Also,
parallelly
stacking
sequence
provides
energetically
favorable
arrangement
H-adsorbed
sites.
Thus,
without
metal,
rate
reaches
high
14.72
mmol
h
−1
g
enantiomeric
mixtures.
This
study
opens
up
strategy
optimizing
kinetics
promises
exciting
photocatalysis.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: June 8, 2023
Covalent
organic
frameworks
(COFs)
have
emerged
as
a
kind
of
crystalline
polymeric
materials
with
high
compositional
and
geometric
tunability.
Most
COFs
are
currently
designed
synthesized
mesoporous
(2-50
nm)
microporous
(1-2
materials,
while
the
development
ultramicroporous
(<1
remains
daunting
challenge.
Here,
we
develop
pore
partition
strategy
into
COF
chemistry,
which
allows
for
segmentation
mesopore
multiple
uniform
domains.
The
is
implemented
by
inserting
an
additional
rigid
building
block
suitable
symmetries
dimensions
prebuilt
parent
framework,
leading
to
partitioning
one
six
ultramicropores.
resulting
framework
features
wedge-shaped
diameter
down
6.5
Å,
constitutes
smallest
among
COFs.
wedgy
one-dimensional
channels
enable
be
highly
efficient
separation
five
hexane
isomers
based
on
sieving
effect.
obtained
average
research
octane
number
(RON)
values
those
isomer
blends
reach
up
99,
highest
records
zeolites
other
porous
materials.
Therefore,
this
important
step
in
functional
exploitation
implement
pre-designed
compositions,
components,
functions.
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
35(40)
Published: June 26, 2023
Artificial
photosynthetic
diluted
CO2
reduction
directly
driven
by
natural
sunlight
is
a
challenging,
but
promising
way
to
realize
carbon-resources
recycling
utilization.
Herein,
three-in-one
photocatalytic
system
of
enrichment,
and
H2
O
oxidation
sites
designed
for
reduction.
A
Zn-Salen-based
covalent
organic
framework
(Zn-S-COF)
with
reductive
synthesized;
then,
ionic
liquids
(ILs)
are
loaded
into
the
pores.
As
result,
[Emim]BF4
@Zn-S-COF
shows
visible-light-driven
-to-CO
conversion
rate
105.88
µmol
g-1
h-1
under
(15%)
atmosphere,
even
superior
than
most
photocatalysts
in
high
concentrations
.
Moreover,
also
reaches
126.51
5
h.
Further
experiments
theoretical
calculations
reveal
that
triazine
ring
Zn-S-COF
promotes
activity
sites,
ILs
provide
an
enriched
realizing
efficient
Materials Chemistry Frontiers,
Journal Year:
2023,
Volume and Issue:
7(16), P. 3298 - 3331
Published: Jan. 1, 2023
This
review
provides
an
overview
of
the
recent
advances
in
heterogeneous
catalysis
using
COFs,
primarily
from
2020
to
2023,
covering
fundamentals,
advantages,
current
challenges,
and
future
perspectives.
Journal of the American Chemical Society,
Journal Year:
2023,
Volume and Issue:
145(24), P. 13241 - 13248
Published: May 26, 2023
Herein,
we
report
a
facile
postsynthetic
linkage
conversion
method
giving
synthetic
access
to
nitrone-linked
covalent
organic
frameworks
(COFs)
from
imine-
and
amine-linked
COFs.
The
new
two-dimensional
(2D)
frameworks,
NO-PI-3-COF
NO-TTI-COF,
are
obtained
with
high
crystallinity
large
surface
areas.
Nitrone-modified
pore
channels
induce
condensation
of
water
vapor
at
20%
lower
humidity
compared
their
amine-
or
imine-linked
precursor
Thus,
the
topochemical
transformation
nitrone
linkages
constitutes
an
attractive
approach
postsynthetically
fine-tune
adsorption
properties
in
framework
materials.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
34(11)
Published: Nov. 27, 2023
Abstract
Covalent
organic
frameworks
(COFs)
are
crystalline
porous
polymers
that
can
be
precisely
integrated
by
building
blocks
to
achieve
pre‐designed
composition,
components,
and
functions,
making
them
a
powerful
platform
for
the
development
of
molecular
devices
in
field
electrocatalysis.
The
precise
control
channel/dopant
positions
highly
ordered
network
structures
COFs
provide
an
ideal
material
system
applications
advanced
In
this
paper,
topological
structure
design
synthesis
methods
reviewed
detail,
their
principles
deeply
analyzed.
addition,
derivatives
electrocatalysis
systematically
summarized
optimization
strategies
proposed.
Finally,
application
prospects
challenges
may
encountered
future
prospected,
providing
helpful
guidance
research.
