Single-atom
catalysts
(SACs)
have
been
investigated
and
applied
to
energy
conversion
devices.
However,
issues
of
metal
agglomeration,
low
loading,
substrate
stability
hindered
realization
the
SACs'
full
potential.
Recently,
covalent
organic
framework
(COF)-based
SACs
emerged
as
promising
materials
enable
highly
efficient
catalytic
reactions.
Here,
we
summarize
representative
COF-based
their
wide
application
in
clean
devices
reactions,
such
hydrogen
evolution
reaction,
carbon
dioxide
reduction
nitrogen
oxygen
reaction.
Based
on
catalysis
conditions,
these
reactions
are
categorized
into
photocatalyzed
electrocatalyzed
We
also
design
strategies,
including
heteroatom
inclusion,
donor–acceptor
pairs,
pore
engineering,
interface
etc.
Although
promising,
more
efforts,
linkage
functional
groups,
ionization,
multifunctional
sites
for
cocatalyzed
systems,
etc.,
could
improve
them
be
ideal
SAC
materials.
At
end,
provide
our
perspectives
where
field
will
proceed
next
5
years.
Chemical Society Reviews,
Journal Year:
2023,
Volume and Issue:
52(22), P. 7949 - 8004
Published: Jan. 1, 2023
Photocatalytic
organic
reactions,
harvesting
solar
energy
to
produce
high
value-added
chemicals,
have
attracted
increasing
attention
as
a
sustainable
approach
address
the
global
crisis
and
environmental
issues.
Reticular
framework
materials,
including
metal-organic
frameworks
(MOFs)
covalent
(COFs),
are
widely
considered
promising
candidates
for
photocatalysis
owing
their
crystallinity,
tailorable
pore
environment
extensive
structural
diversity.
Although
design
synthesis
of
MOFs
COFs
been
intensively
developed
in
last
20
years,
applications
photocatalytic
transformations
still
preliminary
stage,
making
systematic
summary
necessary.
Thus,
this
review
aims
provide
comprehensive
understanding
useful
guidelines
exploration
suitable
MOF
COF
photocatalysts
towards
appropriate
reactions.
The
commonly
used
reactions
categorized
facilitate
identification
reaction
types.
From
practical
viewpoint,
fundamentals
experimental
design,
active
species,
performance
evaluation
external
conditions,
discussed
detail
easy
experimentation.
Furthermore,
latest
advances
COFs,
composites,
comprehensively
summarized
according
actual
sites,
together
with
discussion
structure-property
relationship.
We
believe
that
study
will
be
helpful
researchers
novel
reticular
various
synthetic
applications.
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(31)
Published: May 31, 2023
Covalent
organic
frameworks
(COFs),
possessing
pre-designable
structures
and
tailorable
functionalities,
are
promising
candidates
for
photocatalysis.
Nevertheless,
the
most
studied
imine-linked
COFs
(Im-COFs)
usually
suffer
from
unsatisfactory
stability
photocatalytic
performance.
To
meet
this
challenge,
a
series
of
highly
stable
enaminone-linked
(En-COFs)
have
been
synthesized
afford
much
improved
visible-light-driven
hydrogen
production
activities,
ranging
44
to
1078
times
that
isoreticular
Im-COFs,
with
only
difference
being
linkages
(enaminone
vs.
imine)
in
their
structures.
The
enhanced
light-harvesting
ability,
facilitated
exciton
dissociation
chemical
account
superior
activity.
Furthermore,
quinoline-linked
(Qu-COFs)
further
obtained
via
post-modification
Im-COFs.
Compared
activities
Qu-COFs
significantly
after
modification,
but
still
below
those
corresponding
En-COFs
(3-107
times).
facile
synthesis,
excellent
activity,
high
demonstrate
platform
Small,
Journal Year:
2023,
Volume and Issue:
19(48)
Published: Aug. 4, 2023
Abstract
Covalent
organic
frameworks
(COFs)
are
one
type
of
porous
materials
linked
by
covalent
bonds.
COFs
exhibit
many
outstanding
characteristics
such
as
high
porosity,
chemical
and
thermal
stability,
large
specific
surface
area,
efficient
electron
transfer
efficiency,
the
ability
for
predesigned
structures.
These
exceptional
advantages
enable
to
remarkable
performance
in
photocatalysis.
Additionally,
activity
photocatalysts
can
be
significantly
upgraded
ion
doping
formation
heterojunctions.
This
paper
summarizes
latest
research
progress
on
COF‐based
applied
photocatalytic
systems.
Initially,
typical
structures
preparation
methods
analyzed
compared.
Moreover,
essential
principles
reactions
over
COFs‐based
developments
hydrogen
production,
CO
2
reduction,
pollutants
elimination,
transformation,
overall
water
splitting
indicated.
At
last,
outlook
challenges
photocatalysis
discussed.
review
is
intended
permit
instructive
guidance
use
based
future.
ACS Catalysis,
Journal Year:
2023,
Volume and Issue:
13(20), P. 13167 - 13180
Published: Sept. 28, 2023
Covalent–organic
frameworks
(COFs),
as
promising
metal-free
porous
catalysts,
have
become
a
hot
research
topic
in
the
field
of
(photo)catalysis.
Herein,
series
β-ketoenamine
COFs
are
synthesized
using
different
amino
and
aldehyde
monomers,
these
exhibit
diverse
characteristics
terms
crystallinity,
chemical
structure,
microscopic
morphology,
optoelectronic
properties.
TpBD-(CH3)2
from
2,4,6-triformylphloroglucinol
o-tolidine
exhibits
an
extended
π-conjugated
structure
higher
crystallinity
well
more
suitable
redox
potential,
which
greatly
enhances
photocatalytic
activity
benzylamine
oxidation.
Besides,
increased
number
hydroxyl
groups
on
trialdehyde-based
monomer
contributes
to
ketoamines
TpTAB
skeleton,
is
favorable
for
photocatalysis.
Meanwhile,
can
rapidly
increase
their
own
temperature
through
internal
structural
evolution
under
light
irradiation,
thus
boosting
oxidative
coupling
amines
with
high
efficiency.
This
work
could
provide
some
guidance
rational
design
functional
advanced
organic
transformations.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: June 7, 2024
Developing
highly
active
materials
that
efficiently
utilize
solar
spectra
is
crucial
for
photocatalysis,
but
still
remains
a
challenge.
Here,
we
report
new
donor-acceptor
(D-A)
covalent
organic
framework
(COF)
with
wide
absorption
range
from
200
nm
to
900
(ultraviolet-visible-near
infrared
light).
We
find
the
thiophene
functional
group
accurately
introduced
into
electron
acceptor
units
of
TpDPP-Py
(TpDPP:
5,5'-(2,5-bis(2-ethylhexyl)-3,6-dioxo-2,3,5,6-tetrahydropyrrolo
[3,4-c]pyrrole-1,4-diyl)bis(thiophene-2-carbaldehyde),
Py:
1,3,6,8-tetrakis(4-aminophenyl)pyrene)
COFs
not
only
significantly
extends
its
spectral
capacity
also
endows
them
two-photon
and
three-photon
effects,
greatly
enhancing
utilization
rate
sunlight.
The
selective
coupling
benzylamine
as
target
reactant
used
assess
photocatalytic
activity
COFs,
showing
high
conversion
99%
selectivity
98%
in
20
min.
Additionally,
exhibit
universality
other
imine
derivatives
~100%
efficiency.
Overall,
this
work
brings
significant
strategy
developing
enhance
activity.
