ACS Applied Nano Materials,
Journal Year:
2024,
Volume and Issue:
7(3), P. 3012 - 3023
Published: Jan. 29, 2024
Using
perovskite
photocatalytic
reduction
of
CO2
and
H2O
to
produce
hydrocarbon
fuels
offers
an
attractive
method
solve
the
energy
crisis
greenhouse
effect.
Bi4Ti3O12
(BTO)
has
received
much
attention
in
field
photocatalysis
due
its
unique
layered
structure,
but
it
still
faces
many
challenges
such
as
weak
photoresponse
severe
photogenerated
carrier
recombination.
In
this
paper,
nanosheets
with
different
concentrations
surface
oxygen
vacancies
(VO)
Ti3+
defect
were
prepared
by
molten
salt
NaBH4
high-temperature
(HBTO).
Surface
defects
formed
obvious
traps
on
HBTO
surface,
reduced
recombination
rate
electrons
holes,
adjusted
band
gap
structure
(from
3.09
2.62
eV),
which
improved
visible
light
utilization
HBTO.
The
decrease
photoinduced
improvement
response
significantly
enhanced
activity
under
light.
CH3OH
yield
optimized
HBTO-4
(NaBH4:Bi4Ti3O12
=
1:5)
was
4.90
μmol·g–1·h–1,
about
3.5
times
that
original
BTO.
Meanwhile,
electronic
density
states
(DOS),
work
function
calculated
functional
theory
(DFT).
This
study
provided
effective
strategy
for
designing
preparing
photocatalysts
rich
efficient
conversion
solar
energy.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 10, 2025
Abstract
Oxygen
vacancy
(OV)
defect
engineering
plays
a
crucial
role
in
enhancing
photocatalytic
efficiency.
However,
the
direct
visual
characterization
of
oxygen
vacancies
still
remains
technically
limited.
Herein,
bismuth
titanate
(Bi
4
Ti
3
O
12
,
BTO‐OV)
model
photocatalyst
containing
is
constructed
through
density
functional
theory
(DFT)
calculations
to
reveal
influence
mechanism
distinctive
periodic
quantum
well
and
on
charge
transfer
behavior
BTO.
Notably,
distribution
directly
observed
using
low‐dose
integrated
differential
phase
contrast‐scanning
transmission
electron
microscopy
(iDPC‐STEM),
providing
evidence
for
location
these
BTO‐OV.
Furthermore,
theoretical
calculation
results
are
verified
by
characterizing
photoelectric
properties
conducting
performance
tests
hydrogen
peroxide
(H
2
)
photosynthesis.
Specifically,
BTO‐OV
accelerate
separation,
leading
H
photosynthesis
efficiency
reaching
5278
µ
m
g
−1
h
which
5
times
that
original
This
work
offers
experimental
references
improvement
mechanism.
