Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 17, 2024
Abstract
Hydrogen
peroxide
(H
2
O
)
is
a
crucial
chemical
used
in
numerous
industrial
applications,
yet
its
manufacturing
relies
on
the
energy‐demanding
anthraquinone
process.
Solar‐driven
synthesis
of
H
gaining
traction
as
promising
research
area,
providing
sustainable
method
for
production.
Herein,
controllable
activation
n
→
π*
electronic
transition
presented
to
boost
photocatalytic
evolution
ionic
carbon
nitrides.
This
enhancement
achieved
through
simultaneous
introduction
structural
distortions
and
defect
sites
(─C
≡
N
groups
vacancies)
into
KPHI
framework.
The
optimal
catalyst
(
2%Ox‐
KPHI)
reached
an
apparent
quantum
yield
41%
at
410
nm
without
need
any
cocatalysts,
outperforming
most
previously
reported
nitride‐based
photocatalysts.
Extensive
experimental
characterizations
theoretical
calculations
confirm
that
corrugated
configuration
presence
defects
significantly
broaden
light
absorption
profile,
improve
carrier
separation
migration,
promote
adsorption,
lower
energy
barriers
desorption.
Transient
spectroscopy
indicates
enhanced
performance
2%Ox
‐KPHI
largely
attributed
preferential
migration
electrons
over
extended
timescales,
following
diffusion
geminate
carriers
across
PHI
sheets.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(38)
Published: April 9, 2024
Abstract
Solar‐driven
photocatalytic
oxygen
reduction
is
a
promising
pathway
for
sustainable
hydrogen
peroxide
(H
2
O
)
production.
However,
limited
diffusion
and
low
selectivity
in
the
two‐electron
reaction
hinder
its
practical
application.
Here,
novel
conjugated
organic
polymer
material
(conjugated
triazine‐thiophene
polymer,
CTTP)
based
on
triazine
thiophene,
integrating
favorable
mass
transfer
structure
with
competent
catalytic
centers
presented
first
time.
Remarkably,
under
gas–liquid–solid
triphase
condition,
self‐floating
CTTP
can
rapidly
capture
gaseous
oxygen,
reducing
it
to
superoxide
radicals
transferring
them
interface,
drastically
enhancing
H
yield.
An
excellent
concentration
of
1.85
m
g
−1
h
achieved
system,
representing
remarkable
14‐fold
improvement
compared
liquid
solid
phase
reaction.
Interestingly,
system
demonstrates
potential
large‐scale
production
8
sunlight
irradiation,
reaching
293
ppm
day
−2
.
This
work
opens
up
new
avenue
construction
systems
may
stimulate
future
related
research.
Advanced Science,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 24, 2024
Abstract
Most
self‐powered
electrochemical
sensors
(SPESs)
are
limited
by
low
open
circuit
voltage
and
power
density,
leading
to
a
narrow
detection
range
sensitivity.
Herein,
photoinduced
Zn‐air
battery‐assisted
SPES
(ZAB‐SPES)
is
proposed
based
on
cobalt
sulfur
co‐doped
carbon
nitride
with
the
cyano
group
(Co,
S‐CN).
The
functionalization
remarkably
enhances
visible
light
utilization,
moiety
acts
as
an
electron‐withdrawing
promote
electron
enrichment.
Co
S
co‐doping
can
create
p–n
homojunction
within
nitride,
enabling
efficient
migration
separation
of
carriers,
thereby
significantly
improving
performance
oxygen
reduction
reaction.
synergistic
effects
endow
Co,
S‐CN
photocathode
1.85
V
maximum
density
43.5
µW
cm
−2
in
ZAB.
Employing
heavy
metal
copper
ions
target
model,
ZAB‐SPES
exhibited
dual‐mode
sensitive
detection.
Furthermore,
portable
device
designed
exhibits
high
linearity
5
~
600
n
M
limit
1.7
.
This
work
offers
method
aquatic
environment.
ACS Nano,
Journal Year:
2024,
Volume and Issue:
18(31), P. 20435 - 20448
Published: July 26, 2024
Photocatalytic
H2O2
production
has
attracted
much
attention
as
an
alternative
way
to
the
industrial
anthraquinone
oxidation
process
but
is
limited
by
weak
interaction
between
catalysts
and
reactants
well
inefficient
proton
transfer.
Herein,
we
report
on
a
hydrogen-bond-broken
strategy
in
carbon
nitride
for
enhancement
of
photosynthesis
without
any
sacrificial
agent.
The
promoted
hydrogen
bond
formation
exposed
N
atoms
H2O
molecules,
which
enhances
proton-coupled
electron
transfer
therefore
photocatalytic
activity.
serve
buffering
sites
from
molecules
nitride.
also
enhanced
through
adsorption
reduction
O2
gas
toward
because
nitrogen
vacancies
(NVs)
cyano
groups
after
intralayer
breaking
A
high
light-to-chemical
conversion
efficiency
(LCCE)
value
3.85%
achieved.
are
found
undergo
one-step
two-electron
pathway
photogenerated
hot
electrons
four-electron
produce
gas,
respectively.
Density
functional
theory
(DFT)
calculations
validate
reaction
pathways.
This
study
elucidates
significance
catalyst
reactants,
greatly
increases
tunneling
dynamics.
