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.
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: May 7, 2024
Abstract
Hydrogen
peroxide
(H
2
O
)
has
emerged
as
a
kind
of
multi‐functional
green
oxidants
with
extensive
industrial
utility.
Oxidized
carbon
materials
exhibit
promises
electrocatalysts
in
the
two‐electron
(2e
−
oxygen
reduction
reaction
(ORR)
for
H
production.
However,
precise
identification
and
fabrication
active
sites
that
selectively
yield
present
serious
challenge.
Herein,
structural
engineering
strategy
is
employed
to
synthesize
oxygen‐doped
quantum
dots
(o‐CQD)
2e
ORR.
The
surface
electronic
structure
o‐CQDs
systematically
modulated
by
varying
isomerization
precursors,
thereby
demonstrating
excellent
electrocatalyst
performance.
Notably,
o‐CQD‐3
emerges
most
promising
candidate,
showcasing
remarkable
selectivity
96.2%
(n
=
2.07)
at
0.68
V
versus
RHE,
coupled
low
Tafel
diagram
66.95
mV
dec
−1
.
In
flow
cell
configuration,
achieves
productivity
338.7
mmol
g
catalyst
h
,
maintaining
consistent
production
stability
over
an
impressive
120‐hour
duration.
Utilizing
situ
technology
density
functional
theory
calculations,
it
unveil
edge
are
facilely
functionalized
C‐O‐C
groups
under
alkaline
ORR
conditions.
This
approach
advances
forefront
sustainable
catalysis
provides
profound
insight
into
carbon‐based
design
environmental‐friendly
chemical
synthesis
processes.
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.
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.
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.
Journal of Materials Chemistry A,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
The
development
of
highly
selective
and
active
catalysts
for
electrochemical
carbon
dioxide
reduction
(CO
2
ER)
is
essential
its
practical
application.
Photonics,
Journal Year:
2024,
Volume and Issue:
11(9), P. 841 - 841
Published: Sept. 5, 2024
Mercury
ion
(Hg2+)
is
one
of
the
most
toxic
pollutants
that
can
exist
throughout
environment
and
be
diffused
into
water,
soil,
air,
eventually
food
chain.
Even
a
very
low
level
Hg2+
in
living
organisms
hurt
their
DNA
cause
permanent
damage
central
nervous
system
variety
consequential
disorders.
Hence,
development
sensitive
specific
method
for
detection
at
trace
ranges
extremely
important
as
well
challenging.
Fluorometric
assays
based
on
graphene
quantum
dots
(GQDs)
carbon
(CQDs)
offer
considerable
potential
determination
monitoring
heavy
metals
due
to
fascinating
properties.
Although
yield
GQDs
CQDs
sufficient
use
fluorescent
probes,
doping
with
heteroatoms
significantly
improve
optical
properties
selectivity
toward
analytes.
This
review
explores
primary
advances
great
electronic,
optical,
physical
properties,
synthetic
methods,
fluorimetry
detection.
