Angewandte Chemie International Edition,
Journal Year:
2021,
Volume and Issue:
60(35), P. 19047 - 19052
Published: July 20, 2021
Abstract
Two‐dimensional
covalent
organic
frameworks
(2D
COFs)
are
considered
as
potential
candidates
for
gas
separation
membranes,
benefiting
from
permanent
porosity,
light‐weight
skeletons,
excellent
stability
and
facilely‐tailored
functionalities.
However,
their
pore
sizes
generally
larger
than
the
kinetic
diameters
of
common
molecules.
One
great
challenge
is
fabrication
single‐phase
COF
membranes
to
realize
precise
separations.
Herein,
three
kinds
high‐quality
β‐ketoenamine‐type
nanosheets
with
different
were
developed
aggregated
ultrathin
nanosheet
distinctive
staggered
stacking
patterns.
The
narrowed
derived
micro‐structures
selective
adsorption
capacities
synergistically
endowed
intriguing
CO
2
‐philic
performances,
among
which
TpPa‐2
medium
size
exhibited
an
optimal
/H
factor
22
a
permeance
328
permeation
units
at
298
K.
This
membrane
performance
reached
target
commercial
feasibility
syngas
Advanced Materials,
Journal Year:
2020,
Volume and Issue:
32(48)
Published: Oct. 26, 2020
Abstract
Aqueous
Zn
batteries
that
provide
a
synergistic
integration
of
absolute
safety
and
high
energy
density
have
been
considered
as
highly
promising
energy‐storage
systems
for
powering
electronics.
Despite
the
rapid
progress
made
in
developing
high‐performance
cathodes
electrolytes,
underestimated
but
non‐negligible
dendrites
anode
observed
to
shorten
battery
lifespan.
Herein,
this
dendrite
issue
anodes,
with
regard
fundamentals,
protection
strategies,
characterization
techniques,
theoretical
simulations,
is
systematically
discussed.
An
overall
comparison
between
its
Li
Al
counterparts,
highlight
their
differences
both
origin
topology,
given.
Subsequently,
in‐depth
clarifications
specific
influence
factors
dendrites,
including
accumulation
effect
cathode
loading
mass
(a
distinct
factor
laboratory
studies
practical
applications)
are
presented.
Recent
advances
then
comprehensively
summarized
categorized
generate
an
overview
respective
superiorities
limitations
various
strategies.
Accordingly,
computations
advanced
approaches
introduced
mechanism
guidelines
measurement
criteria
suppression,
respectively.
The
concluding
section
emphasizes
future
challenges
addressing
potential
further
promoting
lifespan
batteries.
Chemical Society Reviews,
Journal Year:
2020,
Volume and Issue:
49(11), P. 3565 - 3604
Published: Jan. 1, 2020
The
current
advances,
structure-property
relationship
and
future
perspectives
in
covalent
organic
frameworks
(COFs)
their
nanosheets
for
electrochemical
energy
storage
(EES)
conversion
(EEC)
are
summarized.
Journal of the American Chemical Society,
Journal Year:
2019,
Volume and Issue:
141(43), P. 17431 - 17440
Published: Oct. 13, 2019
Fabricating
ultrathin
two-dimensional
(2D)
covalent
organic
framework
(COF)
nanosheets
(NSs)
in
large
scale
and
high
yield
still
remains
a
great
challenge.
This
limits
the
exploration
of
unique
functionalities
wide
range
application
potentials
such
materials.
Herein,
we
develop
scalable
general
bottom-up
approach
to
facilely
synthesize
(<2.1
nm)
imine-based
2D
COF
NSs
(including
COF-366
NSs,
COF-367
COF-367-Co
TAPB-PDA
TAPB-BPDA
NSs)
(>100
mg)
(>55%),
via
an
imine-exchange
synthesis
strategy
through
adding
excess
amounts
2,4,6-trimethylbenzaldehyde
into
reaction
system
under
solvothermal
conditions.
Impressively,
visualization
periodic
pore
lattice
for
by
scanning
tunneling
microscope
(STM)
clearly
discloses
nature.
In
particular,
isolated
are
subject
heterogeneous
photocatalyst
CO2-to-CO
conversion,
showing
excellent
efficiency
with
CO
production
rate
as
10
162
μmol
g-1
h-1
selectivity
ca.
78%
aqueous
media
visible-light
irradiation,
far
superior
corresponding
bulk
materials
comparable
thus
reported
state-of-the-art
driven
heterocatalysts.
Chemical Society Reviews,
Journal Year:
2020,
Volume and Issue:
49(8), P. 2291 - 2302
Published: Jan. 1, 2020
Covalent
organic
frameworks
are
crystalline
porous
materials
with
2-
or
3-dimensional
structures
designed
modularly
from
their
molecular
precursors.
Using
bottom-up
top-down
strategies,
single-
few-layer
can
be
obtained
them.
Nature Communications,
Journal Year:
2021,
Volume and Issue:
12(1)
Published: Jan. 4, 2021
Abstract
Covalent
organic
frameworks
(COFs)
are
promising
materials
for
advanced
molecular-separation
membranes,
but
their
wide
nanometer-sized
pores
prevent
selective
gas
separation
through
molecular
sieving.
Herein,
we
propose
a
MOF-in-COF
concept
the
confined
growth
of
metal-organic
framework
(MOFs)
inside
supported
COF
layer
to
prepare
membranes.
These
membranes
feature
unique
micro/nanopore
network,
presumably
due
formation
MOFs
as
pearl
string-like
chain
unit
cells
in
1D
channel
2D
COFs.
The
exhibit
an
excellent
hydrogen
permeance
(>3000
GPU)
together
with
significant
enhancement
selectivity
over
other
gases.
superior
performance
H
2
/CO
and
/CH
4
surpasses
Robeson
upper
bounds,
benefiting
from
synergy
combining
precise
size
sieving
fast
transport
channels.
synthesis
different
combinations
COFs
robust
demonstrates
versatility
our
design
strategy.
Nature Communications,
Journal Year:
2020,
Volume and Issue:
11(1)
Published: Jan. 30, 2020
Abstract
The
preparation
of
subnanoporous
covalent-organic-framework
(COF)
membranes
with
high
performance
for
ion/molecule
sieving
still
remains
a
great
challenge.
In
addition
to
the
difficulties
in
fabricating
large-area
COF
membranes,
main
reason
is
that
pore
size
2D
COFs
much
larger
than
most
gas
molecules
and/or
ions.
It
urgently
required
further
narrow
their
sizes
meet
different
separation
demands.
Herein,
we
report
simple
and
scalable
way
grow
large-area,
pliable,
free-standing
via
one-step
route
at
organic–organic
interface.
can
be
adjusted
from
>1
nm
sub-nm
scale
by
changing
stacking
mode
layers
AA
AB
stacking.
obtained
membrane
composed
highly-ordered
nanoflakes
demonstrated
have
aperture
(∼0.6
nm),
uniform
distribution
shows
good
potential
organic
solvent
nanofiltration,
water
treatment
separation.
Journal of the American Chemical Society,
Journal Year:
2020,
Volume and Issue:
142(15), P. 6872 - 6877
Published: March 28, 2020
In
this
study,
we
propose
a
new
concept
of
vertically
aligned
2D
covalent
organic
framework
(COF)
layers
forming
membrane
for
efficient
gas
separation
on
the
basis
precise
size
exclusion.
Gas
transport
takes
place
through
COF
interlayer
space
(typically
0.3-0.4
nm)
rather
than
nanometer-sized
pore
apertures.
Construction
such
unique
architecture
was
implemented
via
in
situ
oriented
growth
COFs
inside
skeleton
CoAl-layered
double
hydroxide
(LDH)
nanosheets.
The
resultant
vertical
COF-LZU1
exhibits
high
H2
permeance
∼3600
GPU
together
with
desirable
selectivity
mixtures
as
H2/CO2
(31.6)
and
H2/CH4
(29.5),
thus
surpassing
2008
Robeson
upper
bounds.
universality
approach
demonstrated
by
successfully
producing
two
types
high-quality
membranes
superior
performance
well
outstanding
running
stability.
Chemical Society Reviews,
Journal Year:
2020,
Volume and Issue:
50(2), P. 986 - 1029
Published: Nov. 23, 2020
Microporous
framework
membranes
with
well-defined
micropore
structure
such
as
metal-organic
and
covalent
organic
hold
great
promise
for
the
enormous
challenging
separations
in
energy
environment
fields.
