Abstract
MoO
3
thin
film
was
fabricated
on
an
indium
tin
oxide
substrate
using
the
physical
vapor
deposition
technique.
X‐ray
diffraction
and
scanning
electron
microscopy
study
to
investigate
surface
morphology,
grain
size,
structure,
which
are
critical
for
absorbing
solar
spectra
in
water
splitting
hydrogen
energy
generation.
Ultraviolet–visible
spectroscopy
used
confirm
absorption
of
percentage
transmittance.
Fourier‐transform
infrared
analysis
provided
functional
groups
present
deposited
film.
The
Tauc
plot
determine
thin‐film
band
gap,
allowed
charge
carrier
transitions
from
conduction
valence
band.
Electrochemical
impedance
investigations
confirmed
transfer
processes
counter
electrode
electrolyte
interfaces.
observed
low
curve
indicated
resistance
efficient
transfer.
Linear
sweep
voltammetry
measure
photocurrent
light
emission
when
exposed
spectra.
film's
rate
3731.74
mol
g
−1
h
,
STH%
found
be
0.345%
at
0.8
V.
These
findings
highlight
promising
potential
as
a
material
generation
light.
eScience,
Год журнала:
2024,
Номер
unknown, С. 100242 - 100242
Опубликована: Янв. 1, 2024
Bismuth
vanadate
(BiVO4)
is
a
promising
photoanode
material
for
photoelectrochemical
(PEC)
water
oxidation.
However,
its
performance
greatly
hindered
by
poor
bulk
and
interfacial
charge
transfer.
Herein,
to
address
this
issue,
iron
doped
vanadyl
phosphate
(Fe:VOPO4)
was
grafted
on
molybdenum
BiVO4
(Mo:BiVO4)
significantly
enhancing
transfer
oxygen
evolution
kinetics
simultaneously.
Consequently,
the
resultant
Fe:VOPO4/Mo:BVO4
exhibits
remarkable
photocurrent
density
of
6.59
mA
cm−2
at
1.23
V
versus
reversible
hydrogen
electrode
(VRHE)
under
AM
1.5G
illumination,
over
approximately
5.5
times
as
high
that
pristine
BiVO4.
Systematic
studies
have
demonstrated
hopping
activation
energy
small
polarons
reduced
due
Mo
doping,
resulting
in
accelerated
More
importantly,
deposition
Fe:VOPO4
promotes
between
Mo:BiVO4
via
construction
V−O−V
P−O
bonds,
addition
facilitating
splitting
kinetics.
This
work
provides
general
strategy
optimizing
process,
especially
interface
photoanodes
cocatalysts.
Advanced Energy Materials,
Год журнала:
2024,
Номер
14(18)
Опубликована: Янв. 31, 2024
Abstract
Heteroatom
doping
can
tune
the
band
structure
of
semiconductors
and
enhance
their
carrier
transfer
capacity
for
improving
performance
photoelectrochemical
water
oxidation.
Nevertheless,
introduction
dopants
is
not
always
beneficial.
In
this
study,
magnesium
(Mg)
adopted
to
dope
ZnIn
2
S
4
nanosheet
array
photoanodes
form
a
type‐II
reduce
bulk
recombination,
but
concurrently
introduced
deleterious
oxygen
(O)
defects
slow
down
surface
catalytic
reaction
kinetics.
Furthermore,
facile
heat
treatment
strategy
proposed
transform
these
O
into
Mg─O
bonds.
First‐principles
calculations
electrochemical
characterization
indicate
that
presence
bonds
provides
abundant
active
sites
efficiently
accelerates
evolution
by
precisely
realigning
rate‐determining
step
from
OH*
O*
(step
2)
OOH*
4),
thereby
retarding
charge
trapping
recombination.
As
result,
such
photoanode
achieves
remarkable
with
photocurrent
as
high
4.91
mA
cm
−2
at
1.23
V
versus
reversible
hydrogen
electrode,
onset
potential
shifts
negatively
about
340
mV.
This
work
new
defect
modulation
idea
converting
detrimental
favorable
ones,
it
be
expected
have
wide
applications
in
fields
energy,
catalysis,
optoelectronics,
etc.
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(47)
Опубликована: Сен. 3, 2023
Abstract
Although
defect
design
is
an
essential
means
of
improving
the
performance
photocatalytic
materials,
introduction
not
always
beneficial.
Current
engineering
focuses
on
avoiding
or
modifying
introduced
defects
to
mitigate
their
adverse
effects
solar
water
splitting
performance.
This
review
comprehensively
summarizes
strategies
for
and
discusses
crucial
roles
in
splitting.
Focusing
dual
defects,
most
basic
schemes
preparing
favorable
through
pretreatment
posttreatment
methods
are
reviewed.
In
addition,
overcoming
mitigating
detrimental
improve
photocatalysts.
Finally,
challenges
prospects
developing
a
defect‐based
photocatalyst
strategy
outlined.
provides
reference
photocatalysts
conducting
more
in‐depth
research
defects.
Additionally,
it
offers
ideas
utilizing
unfavorable
converting
them
into
improvement.
Abstract
The
application
of
photoelectrochemical
(PEC)
water
splitting
is
limited
by
the
sluggish
surface
oxygen
evolution
reaction
(OER)
kinetics.
OER
kinetics
can
be
effectively
improved
through
cocatalyst
engineering.
However,
tardy
transfer
process
and
serious
recombination
carriers
are
key
factors
restricting
development.
Taking
BiVO
4
as
an
example,
a
Co‐modified
heme
film
rich
in
large
conjugated
ring
structures
introduced
onto
photoanode
using
solvothermal
method.
This
functions
efficient
cocatalyst.
It
considerably
reduces
overpotential,
promotes
photogenerated
holes,
boosts
specifically
affecting
formation
OOH*.
Simultaneously,
formed
CoOV
bonds
induce
strong
interaction
at
photoanode/cocatalyst
interfaces,
reducing
carriers.
Consequently,
onset
potential
optimized
decreases
from
0.45
to
0.07
V
photocurrent
density
1.23
versus
reversible
hydrogen
electrode
5.3
mA
cm
−2
.
work
demonstrates
facile
strategy
for
designing
cocatalysts
obtain
rapid
hole
capability
reduced
carrier
PEC
performance.
Abstract
Sluggish
oxygen
evolution
reactions
on
photoanode
surfaces
severely
limit
the
application
of
photoelectrochemical
(PEC)
water
splitting.
The
loading
cocatalysts
photoanodes
has
been
recognized
as
simplest
and
most
efficient
optimization
scheme,
which
can
reduce
surface
barrier,
provide
more
active
sites,
accelerate
catalytic
reaction
kinetics.
Nevertheless,
introduction
inevitably
generates
interfaces
between
(Ph/OEC),
causes
severe
interfacial
recombination
hinders
carrier
transfer.
Recently,
many
researchers
have
focused
cocatalyst
engineering,
while
few
investigated
effect
Ph/OEC
interface.
Hence,
to
maximize
advantages
cocatalysts,
problems
for
designing
are
systematically
introduced.
In
this
review,
interrelationship
PEC
performance
is
classified
some
methods
characterizing
investigated.
Additionally,
common
strategies
summarized.
This
review
details
cocatalyst‐design‐based
problems,
provides
ideas
offers
references
solving
problems.
The
high‐value
utilization
of
biomass
feedstock
is
fascinating
but
limited
by
efficient
C─H
activation
to
break
C─C
bonds.
Herein,
F‐Fe
2
O
3
‐Mn
photoanodes
with
modulable
compressive
strain
are
fabricated
gradient
infusion
Mn
into
F‐doped
hematite
(F‐Fe
),
which
illustrated
be
highly
for
oxidative
bond
cleavage
various
bio‐based
1,2‐diols
produce
benzoic
acids
or
aromatic
ketones
(94.5–97.2%
yields)
in
photoelectrocatalytic
(PEC)
device,
coupling
a
high
H
production
1180
μmol
cm
−2
(≈96%
yield).
doping
species
the
photoelectrode
bulk
results
improved
photoexcited
carriers
separation
and
transfer
efficiency
(3.41
mA
).
On
other
hand,
lattice
distortion
induced
also
leads
effect
on
F─Fe
─Mn,
can
precisely
modulate
electronic
structure.
Control
experiments,
situ
characterization,
theoretical
calculations
elaborate
that
capable
adjusting
position
d
‐band
center
facilitate
activation,
remarkably
enabling
PEC
breaking
1,2‐diol
desorption
oxidized
product.
This
“one‐stone‐two‐bird”
strategy
presents
straightforward
protocol
efficiently
bonds
organic
transformations
via
oxidation.
