Breaking
symmetry
of
polymeric
carbon
nitride
(CN)
skeleton
by
heteroatomic
substitution
can
induce
in-plane
polar
electric
field,
thus
promoting
the
migration
and
separation
photoexcited
charge
carriers.
Herein,
a
carbon-doped
CN
(pyCN)
embedding
pyridine
ring
was
prepared
through
modification
strategy.
Owing
to
n→π*
electron
transition
formed
obtained
pyCN
displayed
obvious
extended
optical
absorption
photoinduced
efficiency
in
comparison
with
pure
CN.
The
optimized
photocatalytic
H2
evolution
rate
over
reached
242.9
μmol·h−1,
which
is
6
times
that
TEOA
as
sacrifice.
Additionally,
maximum
wavelength
for
performing
capacity
extends
550
nm
from
450
CN,
demonstrating
an
improved
sun
light
utilization
after
modification.
In
addition,
showed
synergistic
oxidation
bisphenol
A
(BPA)
during
hydrogen
generation
under
visible
light.
conversion
BPA
18.7%
24
h
according
external
standard
analysis.
This
work
provides
efficient
approach
enhancing
inhibiting
recombination
higher
performance
wilder
applications.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
12(3), С. 1343 - 1352
Опубликована: Янв. 10, 2024
The
cleavage
of
lignin
C–C
bonds
is
great
significance
for
the
high-value
utilization
lignin.
However,
it
still
faces
challenges
due
to
stubbornness
and
complexity
bonds.
Herein,
cyano
group
with
an
electron-withdrawing
effect
successfully
introduced
into
graphitic
carbon
nitride
(BCN)
photocatalyst
by
alkali
metal
molten
salt
methods,
labeled
KLCN.
Compared
pure
BCN,
micromorphology
electronic
structure
KLCN
have
undergone
significant
changes.
Markedly,
a
short
rod-like
has
excellent
photogenerated
electron–hole
pair
separation
ability
stronger
electron
reduction
ability.
By
combining
persulfate,
bond
in
β-1
models
aromatic
vicinal
diols
was
efficiently
broken.
Mechanistic
studies
shown
that
active
radicals
photocatalytic
reaction
are
regulated
hydroxyl
main
radicals.
It
promotes
participation
water
provides
H
O
atoms
breaking
mainly
follows
single-electron-transfer
mechanism,
which
rare
using
heterogeneous
photocatalyst.
current
work
helpful
guidelines
designing
effective
photocatalysts
cleavage.
Inorganic Chemistry,
Год журнала:
2024,
Номер
63(18), С. 8397 - 8407
Опубликована: Апрель 23, 2024
Photocatalytic
overall
water
splitting
(POWS)
is
a
promising
approach
for
solar-to-hydrogen
conversion.
For
achieving
this
target,
it
urgent
to
develop
efficient
photocatalysts.
Constructing
heterojunction
and
loading
cocatalyst
are
two
effective
strategies
enhancing
POWS.
However,
how
achieve
the
cooperation
of
site
with
charge
separation
remains
huge
challenge.
Herein,
we
present
an
ingenious
method:
precisely
assembling
H
Catalysts,
Год журнала:
2025,
Номер
15(4), С. 315 - 315
Опубликована: Март 26, 2025
To
meet
the
growing
demand
for
renewable
energy,
developing
efficient
and
cost-effective
photocatalytic
materials
is
crucial.
Specifically,
designing
photocatalysts
with
high
charge
separation
efficiency
abundant
hydrogen
production
active
sites
remains
a
key
challenge
practical
applications.
In
this
study,
carbon
nitride
(g-C3N4)-based
ternary
photocatalyst
has
been
constructed
enhanced
H2
without
need
precious
metal
cocatalysts.
CoO
nanoparticles
were
loaded
onto
surface
of
g-C3N4
via
in
situ
thermal
decomposition.
Subsequently,
series
g-C3N4/CoO/CoP
composites
successfully
prepared
using
direct
one-step
phosphorization
method.
Under
optimized
conditions,
catalyst
exhibits
evolution
activity
1277.9
μmol·g−1·h−1,
which
4
times
higher
than
that
g-C3N4/CoO
(with
alone
showing
no
activity).
Its
performance
comparable
to
commonly
used
Pt
cocatalyst.
The
improvement
may
be
attributed
tight
bonding
N-P
bonds,
effectively
promotes
transport
photogenerated
carriers,
while
increased
loading
CoP
provides
more
sites.
results
offer
promising
strategy
low-cost
materials.
Van
der
Waals
(vdW)
heterojunctions,
consisting
of
two-dimensional
monolayers,
represent
a
recent
category
materials
characterized
by
their
highly
adjustable
band
alignment,
bandgap
energy,
and
transition
characteristics.
In
this
investigation,
we
employed
density
functional
theory
calculations
to
explore
the
formation
vdW
heterojunction
involving
heptazine-based
graphitic
carbon
nitride
(g-C3N4)
monolayer
CoN4
(111)
slab,
denoted
as
g-C3N4/CoN4.
This
specific
holds
promise
potential
catalyst
for
solar-driven
photocatalysis
in
water-splitting
reaction.
Upon
creation
heterojunction,
type-I
direct
(Eg
=
2.00
eV)
is
established,
featuring
appropriate
conduction
minimum
valence
maximum
levels
relation
oxidation/reduction
potentials
Moreover,
type
can
be
tuned
finely
applying
external
perpendicular
electric
fields
(±0.5
V/Å)
biaxial
strains
(±6
%).
Notably,
-2%
strain
induces
type-II
alignment
2.1
eV,
direct),
while
an
field
+0.5
V/Å
also
results
heterostructure
1.90
direct).
The
state-of-the-art
DFT
study
reveals
photocatalytic
crossover
g-C3N4/CoN4
from
presence
bilateral
field.
