Heterogeneity
engineering
provides
an
effective
route
to
manipulate
the
chemical
and
physical
properties
of
covalent
organic
frameworks
(COFs)
but
is
still
under
development
for
their
single-crystal
form.
Here,
we
report
strategy
based
on
a
combination
template-assisted
modulated
synthesis
with
one-pot
crystallization-reduction
method
directly
construct
ordered
macro-microporous
single
crystals
amine-linked
three-dimensional
(3D)
COF
(OM-COF-300-SR).
In
this
strategy,
colloidal
crystal-templating
not
only
assists
formation
macropores
also
greatly
facilitates
in
situ
conversion
linkages
(from
imine
amine)
COF-300
crystals.
The
as-synthesized
OM-COF-300-SR120
exhibits
reversible
symmetry
change
from
tetragonal
I41/a
monoclinic
I2/c
space
group
after
activation,
which
was
observed
previously.
On
other
hand,
allows
flexible
control
over
degree
amination
0
100%,
as
determined
by
X-ray
photoelectron
spectroscopy
(XPS)
analysis)
regulate
band
gap
2.57
2.81
eV)
optimization
photocatalytic
activity.
high
embedded
render
superior
activity
(with
reaction
rate
constant
0.9572
min-1)
its
nonmacroporous
counterpart
(NM-COF-300-SR120,
0.2303
degradation
rhodamine
B.
addition,
significant
contribution
confront
mass
transfer
resistance
confirmed
much
higher
catalytic
Au/OM-COF-300-SR120
parameter
7.96
×
103
s-1
mol-1)
compared
Au/NM-COF-300-SR120
(1.43
model
reduction
4-nitrophenol
NaBH4.
Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
38(9), P. 7637 - 7664
Published: April 12, 2024
In
recent
decades,
a
great
interest
in
photocatalytic
water
splitting
has
been
due
to
the
importance
of
sunlight
hydrogen
production
as
renewable
energy
source
reduce
global
warming
effects.
The
applications
metal
sulfide
semiconductors
photocatalysts,
chalcogenide
compounds,
with
advantages
wide
range
for
light
harvesting
and
tunable
bandgap,
may
be
restricted
by
limited
active
sites,
poor
conductivity,
photo
corrosion,
charge
recombination.
sulfur
vacancy
(SV)
effectively
addresses
these
issues
generates
H2
O2
attaining
adequate
water-splitting
because
improved
optoelectronic
features.
This
review
article
aims
comprehensively
highlight
synergistic
roles
SV
sulfides
amended
overall
activity.
SV-modulated
sulfides'
features
are
deliberated,
followed
different
advanced
synthetic
techniques
effectual
defect
generation.
specific
aspects
refining
optical
range,
dynamics
carrier,
photoinduced
surface
chemical
reactions
deeply
described
applications.
Finally,
summarized
vouchsafing
outlooks
opportunities
confronting
S-vacancy
engineered
sulfides-based
photocatalysts
elucidated.
It
would
expected
hoped
that
this
will
help
researchers
design/fabricate
better
sulfide-based
systems.
Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
38(10), P. 8406 - 8436
Published: May 1, 2024
As
one
of
the
best
sustainable
approaches
for
visible-light
production
hydrogen
(H2)
to
meet
energy
demands,
semiconductor-based
photocatalysis
has
received
broad
interest
in
recent
decades.
The
fundamental
restrictions
graphitic
carbon
nitride
(g-C3N4)
as
a
promising
metal-free
photocatalytic
semiconductor
water
splitting,
like
insufficient
harvesting
and
high
electron–hole
(e/h)
pairs
recombination,
have
limited
its
applications
this
goal.
In
regard,
optical,
charge
separation,
surface
features
g-C3N4
can
be
tuned
via
engineering
C/N
vacancies,
which
is
reviewed
here
splitting
by
g-C3N4.
Reports
confirm
that
enhanced
resulting
from
vacancies
are
helpful
adsorption
on
surface,
improving
water-splitting
kinetics.
First
Review,
improvements
structural
optical
characteristics
introducing
especially
nitrogen
will
discussed
illustrate
better
performance.
Then,
various
strategies
creating
controlling
reviewed.
critical
roles
optimizing
performance
also
described,
finally
advances
defective
oxidation
addressed.
Journal of Materials Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 15, 2025
Abstract
As
the
demand
for
sustainable
energy
solutions
grows,
developing
efficient
conversion
and
storage
technologies,
such
as
fuel
cells
metal-air
batteries,
is
vital.
Oxygen
Reduction
Reaction
(ORR)
a
significant
limitation
in
electrochemical
systems
due
to
its
slower
kinetics.
Although
Pt-based
catalysts
are
commonly
used
address
this
challenge,
their
high
cost
suboptimal
performance
remain
obstacles
further
development.
This
review
offers
comprehensive
overview
of
advanced
support
materials
aimed
at
improving
efficiency,
durability,
cost-effectiveness
catalysts.
By
examining
range
materials,
including
mesoporous
carbon,
graphene,
carbon
nanotubes,
metal
oxides,
clarifies
relationship
between
structural
properties
these
supports
influence
on
ORR
performance.
Additionally,
it
discusses
fundamental
characteristics
practical
applications
cells,
explores
potential
future
directions
optimizing
advance
technologies.
Future
research
could
focus
nano-engineering
composite
material
development
unlock
full
catalysts,
significantly
enhancing
economic
viability
applications.
Journal of Materials Chemistry A,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
The
band
structure
is
a
crucial
consideration
in
designing
semiconductor
photocatalysts,
particularly
as
size
has
been
continuously
decreasing
over
the
past
decades.
However,
bandgap
of
nanostructures
usually
broadened...
