Nanoscale,
Journal Year:
2024,
Volume and Issue:
16(24), P. 11592 - 11603
Published: Jan. 1, 2024
A
hybrid
composite
based
on
π-electron
rich
reduced
graphene
oxide
(rGO)
and
mesoporous
silica
(SiO2)
was
prepared
decorated
with
copper
species
to
afford
a
ternary
nanocomposite
material
(Cu-CuO@rGO-SiO2).
This
copper-based
successfully
used
as
robust
multi-tasking
heterogeneous
catalyst
for
most
common
cross-coupling
reactions
(e.g.
C-S,
C-O
C-N
coupling).
broad
range
of
catalytic
activities
are
believed
be
originated
from
the
synergism
different
co-existing
(Cu(0)
CuO)
facile
charge
transfer
metal
ions
towards
rGO-SiO2
matrices,
established
XPS
other
studies.
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 20, 2024
Abstract
The
stability
of
covalent
organic
frameworks
(COFs)
is
crucial
for
their
applications
in
demanding
environments.
However,
increasing
the
COFs
often
comes
with
challenges
such
as
higher
synthesis
difficulty,
lower
crystal
quality,
and
reduced
controllability
during
synthesis,
making
it
difficult
to
regulate
dimensions
morphology,
thereby
impacting
processing
shaping
stable
COFs.
Herein,
study
presents
a
novel
confined
polymerization
approach
guided
by
hydrogen
bonding
preassembly
synthesize
soluble
COF
featuring
β‐ketoenamine
linkage.
presence
relatively
weaker
bonds
accelerates
orderly
arrangement
monomers,
ensuring
appropriate
spacing,
orientations
among
functional
groups.
This
facilitates
efficient
polymerization,
leading
creation
framework
while
minimizing
“self‐correction”
mechanism
growth,
enhancing
efficiency
synthesis.
Furthermore,
this
method
offers
precise
control
over
size
synthesized
COF.
resulting
crystalline
can
be
toggled
between
dissolution
precipitation
states,
facilitating
fabrication
mixed
matrix
membranes
(MMMs)
through
leveraging
solubility
properties
Overall,
pioneering
strategy
yields
valuable
insights
advancing
weak
bond
assembly‐mediated
approaches,
controlled
COFs,
preparation
diverse
applications.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(35)
Published: June 4, 2024
Abstract
Perovskite
quantum
dots
(QDs)
have
shown
attractive
prospects
in
the
field
of
visible
photocatalysis,
especially
synthesis
high
value‐added
chemicals.
However,
under
aerobic
conditions,
stable
operation
QD
catalysts
has
been
limited
by
reactive
oxygen
species
(ROS)
generated
photoexcitation,
superoxide
O
2
⋅
−
.
Here,
we
propose
a
strategy
Ce
3+
doping
perovskite
QDs
to
guide
for
photocatalytic
oxidation
reactions.
In
C(sp
3
)−H
bond
hydrocarbons,
were
rapidly
and
efficiently
utilized
on
surface
QDs,
which
achieves
catalytic
system
obtains
product
conversion
rate
(15.3
mmol/g/h
benzaldehydes).
The
mechanism
studies
show
that
strong
Ce‐oxygen
affinity
accelerates
relaxation
process
photoinduced
exciton
transfer
inhibits
radiative
recombination
pathway.
This
work
provides
new
idea
utilizing
broadens
design
high‐performance
photocatalysts.
