Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: July 3, 2023
Understanding
charge
transfer
dynamics
and
carrier
separation
pathway
is
challenging
due
to
the
lack
of
appropriate
characterization
strategies.
In
this
work,
a
crystalline
triazine/heptazine
carbon
nitride
homojunction
selected
as
model
system
demonstrate
interfacial
electron-transfer
mechanism.
Surface
bimetallic
cocatalysts
are
used
sensitive
probes
during
in
situ
photoemission
for
tracing
S-scheme
photogenerated
electrons
from
triazine
phase
heptazine
phase.
Variation
sample
surface
potential
under
light
on/off
confirms
dynamic
transfer.
Further
theoretical
calculations
an
interesting
reversal
path
light/dark
conditions,
which
also
supports
experimental
evidence
transport.
Benefiting
unique
merit
electron
transfer,
shows
significantly
enhanced
activity
CO2
photoreduction.
Our
work
thus
provides
strategy
probe
mechanisms
design
delicate
material
structures
towards
efficient
ACS Catalysis,
Journal Year:
2022,
Volume and Issue:
12(11), P. 6345 - 6358
Published: May 12, 2022
The
construction
of
intramolecular
homojunction
in
the
carbon
nitride
framework
is
one
advantageous
methods
to
improve
photocatalytic
performance.
Based
on
molecular
self-assembly
strategy
form
homojunction,
showed
enhanced
activity.
However,
disordered
structure
pristine
g-C3N4
obtained
using
traditional
approach
inhibits
dissociation
and
migration
photocarriers.
Here,
we
adopt
a
method
prepare
crystalline
C3N4
(HCCN)
with
functional
group
modifications
ternary
by
multistep
thermal
polymerization.
band
indicates
that
cyano
cyanamide-based
units
HCCN
samples
have
different
highest
occupied
orbital/lowest
unoccupied
orbital
energy
levels,
which
constitute
special
through
arrangement
levels
an
internal
electron
field
molecule.
analysis
photoelectron–hole
pairs
performance
confirms
accelerates
interface
charge
transfer
reduces
reverse
recombination.
Moreover,
compact
greatly
improves
photogenerated
charges.
Femtosecond
transient
absorption
spectra
explain
trajectory
carrier
kinetics
confirm
crystal
semiconductor
modified
groups
can
promote
excitons
free
This
research
provides
idea
obtain
homojunctions.
Journal of Materials Chemistry A,
Journal Year:
2021,
Volume and Issue:
9(42), P. 23765 - 23782
Published: Jan. 1, 2021
The
current
semiconductor
photocatalysts
only
exhibit
unsatisfactory
photocatalytic
efficiency,
due
to
the
easy
recombination
of
photogenerated
carriers.
Regulating
separation
and
transfer
carriers
reducing
are
essential
for
improving
catalytic
efficiency
photocatalysts.
is
produced
by
attraction
Coulomb
force.
Consequently,
requires
an
additional
driving
force
counteract
However,
exploring
mechanism
carrier
regulation
from
perspective
has
received
sporadic
attention.
This
review
firstly
starts
fundamental
impairment
performance.
Then
it
focuses
on
several
main
strategies
regulating
behavior
aspect
carriers,
including
heterojunction
design，construction
intramolecular
donor-acceptor
(D-A)
system,
exciton
regulation,
electron
spin
regulation.
Subsequently,
advanced
characterization
techniques
latest
developments
theoretical
calculations
migration
have
been
introduced.
In
end,
we
summarize
challenges
put
forward
prospects
future
development
Angewandte Chemie International Edition,
Journal Year:
2022,
Volume and Issue:
61(46)
Published: Sept. 23, 2022
Photoreduction
of
CO2
provides
an
appealing
way
to
alleviate
the
energy
crisis
and
manage
global
carbon
balance
but
is
limited
by
high
activation
rate-limiting
proton
transfer.
We
now
develop
a
dual-site
strategy
for
high-efficiency
conversion
through
polarizing
molecules
at
pyridine
N
vacancies
accelerating
intermediate
protonation
protonated
adjacent
nitrogen
on
polymeric
nitride.
Our
photocatalysts
with
atomic-level
engineered
active
sites
manifest
CO
production
rate
1835
μmol
g-1
h-1
,
183
times
higher
than
pristine
bulk
Theoretical
prediction
experimental
studies
confirm
that
such
excellent
performance
attributed
synergistic
effect
between
vacant
in
decreasing
formation
key
*COOH
intermediates
efficient
electron
transfer
relay
facilitated
defect-induced
shallow
trap
state
homogeneous
charge
mediators.
Small,
Journal Year:
2023,
Volume and Issue:
19(27)
Published: March 25, 2023
Abstract
In
recent
years,
photocatalysis
has
received
increasing
attention
in
alleviating
energy
scarcity
and
environmental
treatment,
graphite
carbon
nitride
(g‐C
3
N
4
)
is
used
as
an
ideal
photocatalyst.
However,
it
still
remains
numerous
challenges
to
obtain
the
desirable
photocatalytic
performance
of
intrinsic
g‐C
.
Functional
group
functionalization,
formed
by
introducing
functional
groups
into
bulk
structure,
one
common
modification
techniques
modulate
carrier
dynamics
increases
number
active
sites,
offering
new
opportunities
break
limits
for
structure‐to‐performance
relationship
Nevertheless,
general
overview
advance
less
reported
yet.
order
better
understand
at
molecular
level,
a
review
latest
development
urgently
needed.
this
review,
terms
structures,
properties,
activity
mainly
focused,
well
their
mechanism
reaction
from
level
insights
explained.
Second,
progress
application
introduced
examples
are
given.
Finally,
difficulties
presented,
based
on
this,
outlook
future
research
direction
shown.
