ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 8, 2025
Biomass-based
carbon
materials
are
considered
promising
metal-free
catalysts
for
the
2e-
oxygen
reduction
reaction
(ORR)
to
synthesize
H2O2
and
act
as
air
electrodes
in
Zn-air
batteries.
However,
optimization
of
catalyst
structure
is
a
complex
process
due
diversity
biomass
precursors
synthesis
parameters.
Machine
learning,
new
artificial
intelligence
technology,
has
recently
been
used
various
fields
owing
its
ability
rapidly
analyze
large
amounts
data
guide
material
synthesis.
Consequently,
we
constructed
machine
learning
model
based
on
previously
reported
experimental
guided
fabrication
boron-doped
ORR.
The
achieved
catalytic
performance
exceeded
most
ORR
terms
selectivity
(90-95%
broad
potentials
0.30-0.68
V
vs
reversible
hydrogen
electrode),
stability
(maintaining
over
90%
12
h),
yield
(3450
mmol
gcatalyst-1
h-1),
Faraday
efficiency
(over
90%).
We
applied
batteries
showed
high
capacity
(2856
mAh
g-1)
twice
that
traditional
commercial
metal
catalysts.
Therefore,
this
study
proposed
an
effective
biomass-based
field
electrocatalysis.
Molecules,
Год журнала:
2025,
Номер
30(6), С. 1244 - 1244
Опубликована: Март 10, 2025
Graphene
quantum
dots
(GQDs)
represent
a
class
of
promising
nanomaterials
characterized
by
adjustable
optical
properties,
making
them
well
suited
for
applications
in
biosensing
and
chemical
detection.
However,
challenges
persist
achieving
scalable,
cost-effective
synthesis
enhancing
detection
sensitivity.
In
this
study,
we
have
developed
simple
environmentally
friendly
method
to
prepare
blue
graphene
dots,
c-GQDs,
using
nitronaphthalene
as
precursor,
yellow
y-GQDs,
doped
acid.
The
yield
is
29.75%,
the
average
thickness
2.08
nm
3.95
nm,
respectively.
synthesized
c-GQDs
exhibit
prominent
cyan
fluorescence
at
wavelength
490
under
excitation
380
while
y-GQDs
show
distinct
540
494
nm.
introduction
p-aminobenzoic
acid
(PABA)
introduced
marked
red
shift
fluorescence,
attributed
electron-withdrawing
effect
carboxyl
groups
on
PABA.
This
key
finding
significantly
enhanced
sensitivity
GQDs
detecting
trace
copper(II)
ions
(Cu2+),
heavy
metal
contaminant
posing
serious
environmental
risks.
was
selectively
quenched
presence
Cu2+,
facilitating
accurate
sensitive
even
complex
ion
matrices.
Mechanistic
studies
revealed
that
quenching
driven
strong
static
interactions,
which
inhibit
non-radiative
transitions.
work
not
only
introduces
scalable
producing
high-performance
but
also
highlights
their
potential
effective
fluorescent
probes
monitoring
Abstract
The
electrochemical
activation
of
inert
CO
2
molecules
through
C─C
coupling
reactions
under
ambient
conditions
remains
a
significant
challenge
but
holds
great
promise
for
sustainable
development
and
the
reduction
emission.
Lewis
pairs
can
capture
react
with
,
offering
novel
strategy
electrosynthesis
high‐value‐added
C2
products.
Herein,
an
electron‐beam
irradiation
is
presented
rapidly
synthesizing
metal–organic
framework
(MOF)
well‐defined
(i.e.,
Cu‐
N
pyridinic
).
synthesized
MOFs
exhibit
total
product
faradic
efficiency
70.0%
at
−0.88
V
versus
RHE.
In
situ
attenuated
reflection
Fourier
transform
infrared
Raman
spectra
reveal
that
electron‐deficient
acidic
Cu
sites
electron‐rich
basic
in
ligand
facilitate
targeted
chemisorption,
activation,
conversion
molecules.
DFT
calculations
further
elucidate
electronic
interactions
key
intermediates
reaction.
work
not
only
advances
pair‐site
as
new
platform
conversion,
also
provides
pioneering
insights
into
underlying
mechanisms
irradiated
synthesis
advanced
nanomaterials.
Angewandte Chemie,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 8, 2025
Abstract
The
production
of
hydrogen
peroxide
(H
2
O
)
through
two‐electron
oxygen
reduction
reaction
(2e
−
ORR)
has
emerged
as
a
more
environmentally
friendly
alternative
to
the
traditional
anthraquinone
method.
Although
oxidized
carbon
catalysts
have
intensive
developed
due
their
high
selectivity
and
activity,
yield
conversion
rate
H
under
overpotential
still
limited.
produced
was
rapidly
consumed
by
increased
intensity
reduction,
which
could
ascribe
decomposition
radicals
voltage
in
catalyst.
To
overcome
this
issue,
B
doped
been
catalyze
2e
ORR
with
efficient
suppressing
at
potential.
Thus,
thermal
reducing
containing
groups
(OCGs)
on
graphite
construct
defects
vacancies,
situ
convert
B−C
x
subunits
edge
graphene
sheets.
introduction
effectively
prevented
*O−O
bond
provided
suitable
adsorption
capacity
for
*OOH,
achieving
excellent
across
wide
range.
Finally,
remarkable
7.91
mmol
cm
−2
h
−1
delivered
an
industrial
current
density
600
mA
,
provide
“green”
pathway
scale‐upable
synthesis
.
Inorganic Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 7, 2025
Conventional
fluorescent
pH
sensors,
despite
offering
high
sensitivity
and
rapid
response,
are
limited
by
their
reliance
on
fluorescence
intensity
changes,
hindering
applications
requiring
precise
wavelength
control.
Here,
we
present
a
sensing
strategy
based
cross-linked
carbon
quantum
dots
(CCL-CQDs)
displaying
remarkable
pH-dependent
red
shift
in
the
emission
wavelength.
Amino-
carboxyl-functionalized
CQDs
were
synthesized
via
one-step
hydrothermal
method
further
assembled
into
CCL-CQDs
through
condensation
reaction
between
amino
groups
glutaraldehyde.
The
displayed
excellent
sensitivity,
with
exhibiting
linear
upon
increasing
(from
2.29
to
7.16).
results
of
mechanism
exploration
revealed
that
H+
induced
cleavage
C═N
bonds
CCL-CQD
structure,
leading
formation
–COOH
increased
surface-oxidized
content.
This
enhanced
oxidation
generated
more
surface
defects,
triggering
surface-state-related
emission.
study
demonstrates
successful
synthesis
pH-sensitive
an
detection
performance.
