Catalysts,
Journal Year:
2024,
Volume and Issue:
15(1), P. 19 - 19
Published: Dec. 29, 2024
The
photocatalytic
N2
fixation
reaction
still
faces
high
activation
energy
barriers
and
inefficient
electron
transfer
efficiency,
limiting
the
overall
ammonia
yield
of
semiconductors.
This
communication
reports
on
construction
an
organic/inorganic
g-C3N4/oxygen
vacancy-enriched
TiO2
(g-C3N4/TiO2-OV)
composite
system
via
annealing
treatment
in
H2/Ar
mixed
atmosphere
for
enhanced
activity.
After
illumination
4
h,
g-C3N4/TiO2-OV
with
1
wt%
g-C3N4
loading
demonstrates
optimal
31.6
μmol
L−1.
study
existence
oxygen
vacancies
surface
through
EPR
while
also
investigating
carrier
separation
transport
efficiency
material
using
photoelectric
characterization.
experimental
results
indicate
that
introduction
OVs
into
serves
as
Lewis
acid
sites,
facilitating
adsorption.
Moreover,
lower
onset
potential
higher
current
density
composites
heterojunction
significantly
decreases
interfacial
charge
recombination
barrier,
effectively
improving
towards
photo-reduction.
work
emphasizes
importance
rational
tailoring
TiO2-based
photocatalysts
field
fixation.
Small,
Journal Year:
2024,
Volume and Issue:
20(31)
Published: March 11, 2024
Abstract
While
surface
defects
and
heteroatom
doping
exhibit
promising
potential
in
augmenting
the
electrocatalytic
hydrogen
evolution
reaction
(HER),
their
performance
remains
unable
to
rival
that
of
costly
Pt‐based
catalysts.
Yet,
concurrent
modification
catalysts
by
integrating
both
approaches
stands
as
a
strategy
effectively
address
aforementioned
limitation.
In
this
work,
tungsten
dopants
are
introduced
into
self‐supported
CoFe‐layered
double
hydroxides
(LDH)
on
nickel
foam
using
hydrothermal
method,
oxygen
vacancies
(Ov)
further
through
calcination.
The
analysis
results
demonstrated
reduces
Ov
formation
energy
CoFeW‐LDH.
acted
oxophilic
sites,
facilitating
water
adsorption
dissociation,
reducing
barrier
for
cleaving
HO─H
bonds
from
0.64
0.14
eV.
Additionally,
regulated
electronic
structure
CoFeW‐LDH
endow
optimized
binding
ability
atoms,
thereby
accelerating
alkaline
Volmer
Heyrovsky
kinetics.
Specifically,
abundance
induced
transition
six‐coordinated
highly
active
four‐coordinated
structure,
which
becomes
site
HER.
Consequently,
an
ultra‐low
overpotential
41
mV
at
10
mA
cm
−2
,
low
Tafel
slope
35
dec
−1
achieved.
These
findings
offer
crucial
insights
design
efficient
HER
electrocatalysts.
This
study
investigates
the
enhancement
of
photocatalytic
activity
for
hydrogen
production
through
incorporation
neodymium
oxide
(Nd2O3)
into
bismuth
ferrite
(BiFeO3)
nanoplates,
positioning
water
splitting
as
a
promising
and
sustainable
method.
The
Nd2O3-decorated
BiFeO3
nanoplates
were
synthesized
via
facile
sol–gel
method
followed
by
calcination
at
500
°C,
resulting
in
nanocomposite
structure
characterized
enhanced
light
absorption
charge
separation
capabilities.
Comprehensive
characterization
techniques,
including
X-ray
diffraction
(XRD),
high-resolution
transmission
electron
microscopy
(HR-TEM),
UV–visible
diffuse
reflectance
spectroscopy,
employed
to
confirm
successful
Nd2O3
onto
elucidate
their
structural,
morphological,
optical
properties.
performance
was
rigorously
evaluated
under
visible
irradiation,
demonstrating
significant
evolution
rates─specifically,
an
increase
factor
2
compared
individual
components.
superior
is
attributed
synergistic
effects
Nd2O3,
which
effectively
minimizes
recombination
photogenerated
electron–hole
pairs
enhances
surface
reaction
kinetics.
assertion
corroborated
in-depth
photoelectrochemical
measurements,
electrochemical
impedance
spectroscopy
(EIS)
time-resolved
photoluminescence
(TCSPC),
providing
insights
transfer
mechanisms
origin
activity.
highlights
potential
efficient
photocatalysts
splitting,
contributing
development
pathways
advancing
field
solar-to-chemical
energy
conversion.
