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(31), С. 11717 - 11727
Опубликована: Июль 24, 2024
The
construction
of
efficient
and
nonprecious
cocatalysts,
along
with
the
establishment
rapid
interfacial
charge
migration
pathways
to
host
semiconductors,
is
a
major
process
in
enhancing
photocatalytic
water
splitting
performance
remains
formidable
challenge.
Herein,
composition
CoP/CoO
cocatalysts
on
g-C3N4
regulated
through
phosphating
for
stable
H2
evolution.
Comprehensive
analyses
reveal
that
CoO
nanocrystals,
possessing
bandgap
1.95
eV,
are
uniformly
loaded
onto
portion
undergoing
an
situ
transformation
metallic
CoP,
thereby
forming
well-defined
energy
level
structure
carrier
separation.
Moreover,
exhibited
lower
hydrogen
adsorption
Gibbs
free
(ΔGH)
than
mono
CoP
or
CoO.
optimal
CoP/CoO/g-C3N4
exhibits
attractive
rate
solar-driven
evolution
at
0.86
mmol·g–1·h–1,
surpassing
rates
CoO/g-C3N4
Pt/g-C3N4
by
30
1.5
times,
respectively.
dual-driven
interfaces
provide
2-fold
acceleration
directional
transfer,
conjunction
accelerated
surface
reaction
kinetics,
resulting
This
scalable
strategy,
focusing
engineering
offers
novel
perspective
design
highly
active
boost
application.
Applied Organometallic Chemistry,
Год журнала:
2024,
Номер
38(11)
Опубликована: Авг. 31, 2024
ABSTRACT
Enhancing
the
efficiency
of
charge
carrier
separation
is
crucial
for
improving
performance
photocatalysts,
thereby
offering
more
effective
solutions
to
energy
and
environmental
pollution
challenges.
In
this
study,
a
carbon‐deficient
ultra‐thin
porous
g‐C
3
N
4
(Vc‐UPCN)
was
synthesized
subsequently
integrated
with
Bi
2
Fe
O
9
(BFO)
using
sonochemical
self‐assembly
technique,
/Vc‐UPCN
(
BC
)
photocatalyst
featuring
Z‐scheme
heterojunction.
The
catalyst
subjected
corona
poling
treatment
obtain
p,
which
possesses
an
intrinsic
electric
field.
Compared
pure
BFO
Vc‐UPCN,
heterojunction
exhibited
higher
photo‐generated
electron–hole
photodegradation
ability.
Upon
introduction
polarization,
photocatalytic
further
enhanced.
Specifically,
p‐15
(BFO/BC
mass
fraction
=
15)
achieved
complete
degradation
methylene
blue
(MB)
within
30
min.
BCp‐15
demonstrated
that
its
MB
1.28
times
than
BC‐15,
1.85
impressive
7.69
BFO.
coupling
effect
ferroelectric
polarization
significantly
improved
carriers
in
BCp.
This
study
expected
provide
reference
synergistic
application
traditional
semiconductor
photocatalysis.
In
this
study,
novel
nanocomposites
of
g
C3N4/MN4
(where
M
is
Mn,
Fe,
or
Co)
were
designed
using
advanced
density
functional
theory
(DFT).
The
cutting
edge
DFT
method
was
employed
to
evaluate
the
photocatalytic
activity
(M=Mn,
and
composites.
A
comprehensive
analysis
conducted
on
geometry,
electronic,
optical
properties,
work
function,
charge
transfer
interaction,
adhesion
energy
heterostructure.
Lastly,
potential
heterojunction
as
a
photocatalyst
for
water
splitting
reaction
assessed
by
examining
its
band
alignment
reaction.
Ideally,
splitting,
valence
maximum
(VBM)
position
should
be
higher
than
O2/H2O
(0
V
vs.
NHE),
conduction
minimum
(CBM)
lower
H+/H2
(1.23
vs
NHE).
C3N4/FeN4
C3N4/CoN4
composites
meet
requirement,
making
them
suitable
use
photocatalysts
splitting.
Physical Chemistry Chemical Physics,
Год журнала:
2024,
Номер
26(15), С. 11667 - 11675
Опубликована: Янв. 1, 2024
Tremella-like
NiMoP/CoP
was
synthesized
on
Ni
foam
via
a
hydrothermal
and
low-temperature
phosphating
method,
exhibiting
remarkable
electrocatalytic
activity
with
an
ultralow
overpotential
of
38
mV
(10
mA
cm
−2)
low
Tafel
slope
83
dec
−1.
Density
functional
theory
was
employed
to
calculate
the
photocatalytic
activity
of
gC3N4/CoN4
heterojunction.
g-C3N4
is
a
semiconductor
and
CoN4
half
metal,
eventually
resultant
heterojunction
metallic
in
nature.
The
metallicity
originates
from
spin
down
channel
g-C3N4/CoN4
while
up
behaves
as
semiconductor.
stability
confirmed
by
calculating
formation
energy
its
isolated
analogs.
Charge
density
analysis
work
function
calculation
suggests
substantial
amount
charge
transfer
direction
found
be
unit.
optical
absorption
nanocomposite
significantly
enhanced
UV-visible
region
comparison
CoN4.
In
g-C3N4/CoN4,
valence
band
maximum
(VBM)(+1.42V)
exhibits
more
positive
potential
compared
O2/H2O(+1.23V)
on
NHE
scale,
conduction
minimum
(CBM)(-0.38V)
displays
negative
than
that
H+
/H2(0V)
scale.
Consequently,
this
can
effectively
utilized
for
water
splitting.
Finally,
details
structure,
states
edge
position
determining
calculations
confirm
composite
forms
type
1
heterojunction,
making
it
suitable
photocatalyst
splitting
reaction.
state-of-theart
theoretical
modeling
first
study
incorporating
crystal.
The Journal of Physical Chemistry C,
Год журнала:
2024,
Номер
128(14), С. 5900 - 5908
Опубликована: Март 27, 2024
Utilizing
photocatalysis
to
split
water
is
a
highly
prospective
technique
for
H2
evolution.
However,
carrier
recombination
in
photocatalysts
results
poor
photocatalytic
evolution
performance.
The
introduction
of
metallic
substances
as
cocatalysts
has
found
extensive
application
enhancing
the
existence
Schottky
barriers
remains
hindrance
separation
photogenerated
carriers.
In
this
work,
electronic
structure
g-C3N4
was
modulated
and
optimized
by
P
doping,
changing
contact
mode
from
Ohmic
contact,
greatly
promoting
charge
transfer.
Under
xenon
lamp
illumination,
production
rate
prepared
photocatalyst
nearly
5
times
that
original
one.
This
work
gives
new
insights
into
rational
design
an
efficient
water-splitting
photocatalyst.
