ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(32), P. 42632 - 42640
Published: July 31, 2024
Photoactivation
is
a
phenomenon
that
could
enhance
the
photoluminescence
(PL)
and
photostability
upon
UV/vis
light
exposure,
which
usually
observed
in
CdSe/ZnS
quantum
dots
(QDs).
However,
photoactivation
has
been
scarcely
reported
fluorescent
carbon
(CQDs).
Herein,
nitrogen-doped
(N-CQDs)
were
prepared
through
facile
solvothermal
approach
with
naphthalenetracarboxylic
dianhydride
serine
as
precursors.
Upon
simple
UV
irradiation
for
10
min,
fluorescence
yield
(QY)
of
N-CQDs
increase
up
to
10-fold.
Based
on
this
phenomenon,
explored
an
ultraviolet
(UV)
sensor
assess
intensity
radiation
sunlight
indirectly
evaluate
UV-blocking
efficiency
various
sunscreen
products.
Thus,
contribution
not
only
provided
insight
into
developing
low-cost
detector
but
also
opened
door
development
converse-photobleaching
properties.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: June 6, 2024
Abstract
Carbon
quantum
dots
(CQDs)
have
versatile
applications
in
luminescence,
whereas
identifying
optimal
synthesis
conditions
has
been
challenging
due
to
numerous
parameters
and
multiple
desired
outcomes,
creating
an
enormous
search
space.
In
this
study,
we
present
a
novel
multi-objective
optimization
strategy
utilizing
machine
learning
(ML)
algorithm
intelligently
guide
the
hydrothermal
of
CQDs.
Our
closed-loop
approach
learns
from
limited
sparse
data,
greatly
reducing
research
cycle
surpassing
traditional
trial-and-error
methods.
Moreover,
it
also
reveals
intricate
links
between
target
properties
unifies
objective
function
optimize
like
full-color
photoluminescence
(PL)
wavelength
high
PL
yields
(PLQY).
With
only
63
experiments,
achieve
fluorescent
CQDs
with
PLQY
exceeding
60%
across
all
colors.
study
represents
significant
advancement
ML-guided
synthesis,
setting
stage
for
developing
new
materials
properties.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(38)
Published: May 7, 2024
Abstract
Solar‐driven
synthesis
of
hydrogen
peroxide
(H
2
O
)
through
photocatalysis
stands
out
as
a
promising
avenue
for
sustainable
energy
generation,
marked
by
environmental
friendliness
and
industrial
feasibility.
However,
the
inherent
limitations
carbon
nitride
(CN)
in
photocatalytic
H
production
significantly
impede
their
performance.
Herein,
novel
0D/2D
dots‐modified
CN
nanosheet
heterojunction
(CDsMCN)
is
introduced,
synthesized
hydrothermal‐calcination
tandem
strategy
induced
CDs
derived
from
melamine.
This
innovative
technique
enhances
n→π*
electronic
transition
CDsMCN,
accelerating
separation
efficiency
electron‐hole
pairs,
boosting
oxygen
adsorption,
promoting
highly
selective
2e
−
ORR.
Comparative
to
pristine
CN,
10
MCN
exhibited
remarkable
tenfold
increase
production,
reaching
an
impressive
1.48
mmol
L
−1
.
Furthermore,
demonstrates
exceptional
stability,
maintaining
its
catalytic
at
initial
level
over
four
consecutive
cycles.
The
notable
achievement
molar
selectivity
≈80%
onset
potential
0.6
V
(vs
RHE)
underscores
ability
produce
desired
product
selectively.
Advanced
situ
characterization
together
with
DFT
calculations
revealed
that
ultrathin
enhanced
improves
optical
properties,
reduces
bandgap,
facilitates
fast
charge
migration,
increases
performance,
thereby
serving
candidate
advanced
applications.
Advanced Science,
Journal Year:
2024,
Volume and Issue:
11(28)
Published: May 10, 2024
Abstract
Graphitic
carbon
nitride
(CN),
as
a
nonmetallic
photocatalyst,
has
gained
considerable
attention
for
its
cost‐effectiveness
and
environmentally
friendly
nature
in
catalyzing
solar‐driven
CO
2
conversion
into
valuable
products.
However,
the
photocatalytic
efficiency
of
reduction
with
CN
remains
low,
accompanied
by
challenges
achieving
desirable
product
selectivity.
To
address
these
limitations,
two‐step
hydrothermal‐calcination
tandem
synthesis
strategy
is
presented,
introducing
quantum
dots
(CQDs)
forming
ultra‐thin
CQD/CN
nanosheets.
The
integration
CQDs
induces
distinct
work
function
CN,
creating
robust
interface
electric
field
after
combination.
This
facilitates
accumulation
photoelectrons
region,
providing
an
abundant
source
reduced
electrons
process.
Remarkably,
nanosheets
exhibit
average
yield
120
µmol
g
−1
,
showcasing
outstanding
selectivity
92.8%.
discovery
not
only
presents
innovative
pathway
development
high‐performance
photocatalysts
grounded
non‐metallic
materials
employing
but
also
opens
new
avenues
versatile
application
prospects
environmental
protection
sustainable
cleaning
energy.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(45), P. 31253 - 31261
Published: Jan. 1, 2024
The
widespread
utilization
of
noble
metal-based
catalysts
for
the
oxygen
evolution
reaction
(OER)
is
hindered
by
their
rarity
and
substantial
expense,
posing
significant
challenges
large-scale
applications.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(22), P. 29060 - 29068
Published: May 20, 2024
Highly
efficient
electrochemical
CO2-to-CO
conversion
is
a
promising
approach
for
achieving
carbon
neutrality.
While
nonmetallic
electrocatalysts
have
shown
potential
utilization
in
H-type
cells,
flow
cells
at
an
industrial
scale
remains
challenging.
In
this
study,
we
present
cost-effective
synthesis
strategy
preparing
ultrathin
2D
nanosheet
catalysts
through
simple
amine
functionalization.
The
optimized
catalyst,
NCNs-2.5,
demonstrates
exceptional
CO
selectivity
with
maximum
Faradaic
efficiency
of
98%
and
achieves
high
current
density
55
mA
cm-2
cell.
Furthermore,
the
catalyst
exhibits
excellent
long-term
stability,
operating
continuously
50
h
while
maintaining
above
90%.
superior
catalytic
activity
NCNs-2.5
attributed
to
presence
amine-N
active
sites
within
lattice
structure.
This
work
establishes
foundation
rational
design
as
sustainable
alternatives
metals
energy
systems.
