Journal of the American Chemical Society,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 9, 2024
Simultaneously
controlling
both
stoichiometry
and
atom
arrangement
during
the
synthesis
of
multimetallic
nanoparticles
is
often
challenging,
especially
when
desired
metal
precursors
exhibit
large
differences
in
their
intrinsic
reduction
kinetics.
In
such
cases,
traditional
synthetic
methods
lead
to
formation
exclusively
phase-segregated
structures.
this
study,
we
demonstrate
that
relative
kinetics
can
be
manipulated
independently
rates
by
modulating
instantaneous
concentrations
cation
precursors.
We
achieve
control
adjusting
precursor
addition
rate,
which
decouples
chemical
ordering
outcomes
from
To
guide
these
experiments,
describe
a
quantitative
model
determine
how
ion
evolve
with
variations
rate
thereby
predict
optimal
conditions
for
precise
structural
compositional
outcomes.
efficacy
experimentally
synthesizing
core@shell
alloyed
stoichiometric
using
same
two
different
bimetallic
systems
(Au–Pd
Au–Pt)
as
well
quinary
system
(Co,
Ni,
Cu,
Pd,
Pt).
This
approach
enables
design
nanoparticle
architectures
independent
potentials
constituent
metals
while
maintaining
control.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 25, 2025
Abstract
The
arrangement
of
atoms
in
the
catalyst
directly
impacts
catalytic
performance.
Herein,
a
heteroatom
doping
strategy
is
found
as
an
effective
approach
for
regulation
MnO
2
crystal
reconstruction
during
oxygen
evolution
reaction
(OER),
thereby
ensuring
and
optimizing
performance
catalyst.
Real‐time
tracking
dynamic
surface
reveals
that
δ‐MnO
transforms
into
less
active
γ‐MnOOH
phase,
while
single‐atom
Fe
facilitates
formation
highly
α‐MnOOH
phase.
asymmetric
Fe─O─Mn
bonds
induce
lattice
distortions
promote
electron
transfer
from
to
Mn
with
increase
3
⁺
content,
which
conducive
intensifying
spillover
crucial
factor
OER
activity.
Theoretical
calculations
also
demonstrate
sites
regulated
representative
can
reduce
energy
barrier
step
process
(the
*O
*OOH
transition),
thus
significantly
enhancing
typical
achieves
successful
processes
through
doping,
holds
significant
implications
developing
new
class
catalysts,
not
limited
catalysts
reported
this
study.
Chemical Science,
Год журнала:
2024,
Номер
15(38), С. 15737 - 15744
Опубликована: Янв. 1, 2024
We
realized
the
confined
assembly
of
uranyl
within
single-walled
carbon
nanotubes
and
unveiled
directional
growth
reconstruction
U
4
O
9
nanorods
in
nanochannels
enabled
by
situ
transmission
electron
microscopy
e-beam
stimulation.
Chemical Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 27, 2024
This
review
provides
an
overview
of
the
advances
in
high
entropy
spinel
oxides
diverse
catalytic
reactions
and
highlights
intrinsic
structure–property–performance
relationships.
The Journal of Physical Chemistry C,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 3, 2025
Carbon
nanomaterials,
as
novel
functional
and
structural
materials
with
unique
properties,
hold
significant
potential
in
information
technology
nanodevices.
However,
the
self-catalytic
growth
mechanism
of
graphite
shells
derived
from
carbon
sources,
facilitated
by
diverse
catalysts,
necessitates
further
exhaustive
investigation.
To
tackle
this
challenge,
we
conducted
a
study
utilizing
environmental
transmission
electron
microscopy
(ETEM)
at
atomic
resolution
to
investigate
pyrolysis
metal
phthalocyanine
(MPc)
compounds
containing
various
central
metals,
including
Ni,
Co,
Cu,
Zn.
The
results
reveal
that
atoms
initially
dissolve
into
Ni
leading
formation
carbides
subsequently
act
catalysts.
Upon
achieving
saturation,
these
precipitate
outward
interior,
fostering
through
bulk
mode.
In
contrast,
for
Cu
Zn,
migrate
accumulate
on
surface,
resulting
via
surface
distinct
mechanisms,
i.e.,
growth,
are
intricately
governed
binding
energy
between
well
solubility
metal.
These
factors
closely
tied
number
metals'
d-electrons
because
more
vacant
d-orbitals
easily
forming
coordination
numbers.
insights
offer
profound
understanding
fundamental
principles
metal-catalyzed
shell
provide
strategic
roadmap
selecting
designing
catalysts
can
optimize
synthesis
desirable
nanomaterials.
Inorganic Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 22, 2025
The
ability
to
finely
tune
the
nuclearity
of
active
metal
sites
is
critical
for
designing
highly
selective
catalysts,
especially
hydrogenation
processes.
In
this
work,
we
developed
a
novel
PdCu
catalyst
with
an
ordered
body-centered
cubic
(BCC)
structure,
enabling
precise
control
over
Pd
optimize
selectivity.
Using
facile
polyol
synthesis
method,
modulated
coordination
environment,
reducing
Pd-Pd
number
from
3
(disordered
face-centered
cubic,
FCC)
0
(ordered
BCC),
thereby
achieving
full
isolation
by
surrounding
Cu
atoms.
This
structural
transformation
enhances
hydrogen
spillover
and
weakens
ethylene
adsorption,
resulting
in
superior
activity
acetylene
ethylene.
supported
on
Al2O3
(o-PdCu/Al2O3)
achieved
99%
conversion
84.5%
selectivity
at
near-room
temperature.
work
highlights
importance
controlling
atomic-scale
catalysts
provides
promising
strategy
improving
catalytic
efficiency
industrially
significant
Multielemental
alloy
(MEA)
nanomaterials,
such
as
medium
and
high
entropy
alloys,
display
promising
catalytic
performance
in
a
range
of
chemical
reactions
due
to
their
multicomponent
structural
configurations.
These
complex
arrangements
can
be
influenced
by
several
factors,
mechanical
stress,
irradiation,
temperatures,
which
impact
the
MEAs
various
applications.
Here,
we
investigated
effect
temperatures
on
MEA
nanoparticles
composed
noble
transition
metals
(quaternary
PtPdFeCo)
at
atomic
scale
found
material
undergoes
series
phase
transitions
between
solid
solution
intermetallic
phases
elevated
ranging
from
room
temperature
1073
K.
In
contrast,
binary
PtFe
nanoalloy
displays
one-way
these
temperatures.
Our
findings,
rationalized
density
functional
theory
(DFT)
studies,
demonstrate
how
varied
migration
energies
elements
govern
differences
bonding
elemental
pairs
influence
Gibbs
free
energy
change
(ΔG),
dictates
solid-solution
transition.
Overall,
this
work
provides
better
guidance
design,
development,
usage
nano-MEAs
for
high-temperature-based
