Applied Surface Science Advances,
Journal Year:
2023,
Volume and Issue:
19, P. 100536 - 100536
Published: Dec. 28, 2023
In
the
evolving
field
of
photocatalysis,
heterojunction
photocatalysts,
especially
Type
II
and
S-scheme,
latter
being
also
known
as
direct-Z
scheme
heterojunctions,
are
gaining
increasing
recognition
for
their
pivotal
role
in
enhancing
photocatalytic
efficiency.
These
characterized
by
similar
band
alignments
but
distinct
charge
transfer
mechanisms,
play
a
crucial
facilitating
enhanced
separation
transfer.
This
comprehensive
review
delves
into
experimental
methodologies
essential
characterizing
these
with
focus
on
understanding
unique
mechanisms.
Key
methods
such
Electron
Spin
Resonance
(ESR),
radical
trapping
experiments,
Photoluminescence
(PL)
probing,
Nitro
Blue
Tetrazolium
(NBT)
transformation,
Surface
Photovoltage
Spectroscopy
(SPS),
photodeposition
metals,
in-situ
X-ray
Photoelectron
(in-situ
XPS)
analysis
discussed
detail.
Each
technique
is
presented
necessary
guidelines
accompanying
information
to
ensure
appropriate
effective
use
pinpointing
specifics
processes.
The
concludes
that
right
selection
techniques
mechanism
staggered
type
heterojunctions
achieving
further
advancements
photocatalysis.
Proceedings of the National Academy of Sciences,
Journal Year:
2024,
Volume and Issue:
121(23)
Published: May 30, 2024
Single-atom
catalysts
(SACs)
with
atomic
dispersion
active
sites
have
exhibited
huge
potentials
in
peroxymonosulfate
(PMS)-based
Fenton-like
chemistry
water
purification.
However,
four-N
coordination
metal
(MN
4
)
moieties
often
suffer
from
such
problems
as
low
selectivity
and
narrow
workable
pH.
How
to
construct
SACs
a
controllable
strategy
optimized
electronic
structures
is
of
great
challenge.
Herein,
an
innovative
(i.e.,
the
“4
+
1”
fabrication)
was
devised
precisely
modulate
first-shell
coordinated
microenvironment
FeN
SAC
using
additional
N
(SA-FeN
5
).
This
leads
almost
100%
selective
formation
high-valent
iron-oxo
[Fe(IV)═O]
(steady-state
concentration:
2.00
×
10
−8
M)
SA-FeN
/PMS
system.
In-depth
theoretical
calculations
unveil
that
configuration
optimizes
electron
distribution
monatomic
Fe
sites,
which
thus
fosters
PMS
adsorption
reduces
energy
barrier
for
Fe(IV)═O
generation.
then
attached
polyvinylidene
difluoride
membrane
continuous
flow
device,
showing
long-term
abatement
microcontaminant.
work
furnishes
general
effective
activation
metal-oxo
species
generation
by
high
N-coordination
number
regulation
SACs,
would
provide
guidance
rational
design
superior
environmental
