Chemical Engineering Journal,
Journal Year:
2023,
Volume and Issue:
476, P. 146818 - 146818
Published: Oct. 20, 2023
It
is
an
efficient
strategy
to
construct
photocatalysts
by
integrating
the
advantages
of
inorganic
semiconductors
and
covalent
organic
frameworks
(COFs)
for
H2
generation
along
with
simultaneous
oxidation.
Herein,
inorganic/organic
CdS/COF
(denoted
as
TpBD)
2D
heterostructure
fabricated
electrostatic
self-assembly
method.
The
ultrathin
structure
can
reduce
charge
transfer
distance,
enhance
light
absorption,
multiply
reaction
sites
while
S-scheme
heterojunction
improves
separation
efficiency.
composite
acquires
outstanding
photocatalytic
activity
15.1
mmol/g/h,
simultaneously
convert
cheap
ascorbic
acid
value-added
2,3-diketo-L-gulonic
acid.
Hall
effect
test
elucidates
dynamics
carrier
migration.
electron
paramagnetic
resonance
analysis,
photo-irradiated
Kelvin
probe
force
microscopy,
femtosecond
transient
absorption
spectroscopy,
theoretical
calculation,
in-situ
irradiation
X-ray
photoelectron
spectroscopy
measurements
confirm
superiority
transfer.
This
research
presents
new
inspiration
develop
hydrogen
production
green
chemical
production.
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
36(8)
Published: Nov. 22, 2023
Abstract
Semiconductor
photocatalytic
technology
holds
immense
promise
for
converting
sustainable
solar
energy
into
chemically
storable
energy,
with
significant
applications
in
the
realms
of
and
environment.
However,
inherent
issue
rapid
recombination
photogenerated
electrons
holes
hinders
performance
single
photocatalysts.
To
overcome
this
challenge,
construction
2D
S‐scheme
heterojunction
photocatalysts
emerges
as
an
effective
strategy.
The
deliberate
design
dimensionality
ensures
a
substantial
interfacial
area;
while,
charge
transfer
mechanism
facilitates
efficient
separation
maximizes
redox
capabilities.
This
review
commences
fresh
perspective
on
heterojunctions,
followed
by
comprehensive
exploration
preparation
methods
characterization
techniques.
Subsequently,
recent
advancements
are
summarized.
Notably,
behind
activity
enhancement
is
elucidated.
Finally,
prospects
development
presented.
Angewandte Chemie International Edition,
Journal Year:
2022,
Volume and Issue:
62(8)
Published: Dec. 29, 2022
The
S-scheme
heterojunction
is
flourishing
in
photocatalysis
because
it
concurrently
realizes
separated
charge
carriers
and
sufficient
redox
ability.
Steady-state
transfer
has
been
confirmed
by
other
methods.
However,
an
essential
part,
the
dynamics
heterojunctions,
still
missing.
To
compensate,
a
series
of
cadmium
sulfide/pyrene-alt-difluorinated
benzothiadiazole
heterojunctions
were
constructed
photophysical
processes
investigated
with
femtosecond
transient
absorption
spectroscopy.
Encouragingly,
interfacial
charge-transfer
signal
was
detected
spectra
heterojunction,
which
provides
solid
evidence
for
to
complement
results
from
well-established
Furthermore,
lifetime
calculated
be
ca.
78.6
ps.
Moreover,
photocatalysts
exhibit
higher
photocatalytic
conversion
1,2-diols
H2
production
rates
than
bare
sulfide.
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
35(33)
Published: June 15, 2023
Abstract
Covalent
organic
frameworks
(COFs)
have
shown
great
promise
for
photocatalytic
hydrogen
evolution
via
water
splitting.
However,
the
four‐electron
oxidation
of
remains
elusive
toward
oxygen
evolution.
Enabling
this
pathway
is
critical
to
improve
yield
and
maximize
atom
utilization
efficiency.
A
Z‐scheme
heterojunction
proposed
overcoming
fundamental
issues
in
COF‐based
overall
splitting
(OWS),
such
as
inefficient
light
absorption,
charge
recombination,
poor
ability.
It
that
construction
a
novel
2D/2D
through
situ
growth
COFs
on
O‐vacancy
WO
3
nanosheets
(Ov‐WO
)
WOC
chemical
bond
can
remarkably
promote
OWS.
Benefiting
from
synergistic
effect
between
enhanced
built‐in
electric
field
by
interfacial
bond,
strong
ability
Ov‐WO
3,
ultrathin
structure
TSCOF,
both
separation
efficiency
photogenerated
electron–hole
pairs
be
significantly
enhanced.
An
impressive
half‐rection
rate
593
mmol
h
−1
g
146
(hydrogen)
68
(oxygen)
µmol
are
achieved
COF‐WO
(TSCOFW)
composite.
This
with
two‐step
excitation
precisely
cascaded
charge‐transfer
makes
it
responsible
efficient
solar‐driven
OWS
without
sacrificial
agent.
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(50)
Published: Nov. 1, 2023
Cooperative
coupling
of
H2
evolution
with
oxidative
organic
synthesis
is
promising
in
avoiding
the
use
sacrificial
agents
and
producing
hydrogen
energy
value-added
chemicals
simultaneously.
Nonetheless,
photocatalytic
activity
obstructed
by
sluggish
electron-hole
separation
limited
redox
potentials.
Herein,
Ni-doped
Zn0.2
Cd0.8
S
quantum
dots
are
chosen
after
screening
DFT
simulation
to
couple
TiO2
microspheres,
forming
a
step-scheme
heterojunction.
The
configuration
tunes
highly
active
site
for
augmented
evolution,
interfacial
Ni-O
bonds
provide
fast
channels
at
atomic
level
lower
barrier
charge
transfer.
Also,
calculations
reveal
an
enhanced
built-in
electric
field
heterojunction
superior
migration
separation.
Kinetic
analysis
femtosecond
transient
absorption
spectra
demonstrates
that
expedited
electrons
first
transfer
Ni2+
then
sites.
Therefore,
designed
catalyst
delivers
drastically
elevated
yield
(4.55
mmol
g-1
h-1
)
N-benzylidenebenzylamine
production
rate
(3.35
).
This
work
provides
atomic-scale
insights
into
coordinated
modulation
sites
fields
ameliorative
performance.
Chemical Communications,
Journal Year:
2022,
Volume and Issue:
59(6), P. 688 - 699
Published: Dec. 21, 2022
This
feature
article
introduces
the
basic
principles
of
femtosecond
transient
absorption
spectroscopy
(fs-TAS)
and
recent
advances
in
application
fs-TAS
to
heterojunction
photocatalysts.
Angewandte Chemie,
Journal Year:
2022,
Volume and Issue:
135(8)
Published: Dec. 29, 2022
Abstract
The
S‐scheme
heterojunction
is
flourishing
in
photocatalysis
because
it
concurrently
realizes
separated
charge
carriers
and
sufficient
redox
ability.
Steady‐state
transfer
has
been
confirmed
by
other
methods.
However,
an
essential
part,
the
dynamics
heterojunctions,
still
missing.
To
compensate,
a
series
of
cadmium
sulfide/pyrene‐
alt
‐difluorinated
benzothiadiazole
heterojunctions
were
constructed
photophysical
processes
investigated
with
femtosecond
transient
absorption
spectroscopy.
Encouragingly,
interfacial
charge‐transfer
signal
was
detected
spectra
heterojunction,
which
provides
solid
evidence
for
to
complement
results
from
well‐established
Furthermore,
lifetime
calculated
be
ca.
78.6
ps.
Moreover,
photocatalysts
exhibit
higher
photocatalytic
conversion
1,2‐diols
H
2
production
rates
than
bare
sulfide.
