Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 19, 2024
Abstract
High‐entropy‐alloy
(HEA)
nanocrystals
hold
immense
potential
for
catalysis,
offering
virtually
unlimited
alloy
combinations
through
the
inclusion
of
at
least
five
constituent
elements
in
varying
ratios.
However,
general
and
effective
strategies
synthesizing
libraries
HEA
with
controlled
surface
atomic
structures
remain
scarce.
In
this
study,
a
transferable
strategy
developing
library
facet‐controlled
seed@HEA
seed‐mediated
growth
is
presented.
The
synthesis
core–shell
incorporating
up
to
ten
different
metallic
elements,
control
over
number
solid‐solution
layers
demonstrated.
Epitaxial
on
nanocrystal
seeds
low‐index
high‐index
facets
leads
formation
catalyst
composition‐
facet‐dependent
catalytic
activities
both
electrocatalysis
photocatalysis.
situ
synchrotron
X‐ray
absorption
spectroscopy
density‐functional
theory
calculations
are
employed
identify
active
sites
HEA,
rationalizing
high
level
achieved.
This
work
enables
facet
engineering
multi‐elemental
chemical
space
unveils
critical
needs
their
future
development
toward
catalysis.
Advanced Energy Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 28, 2024
Abstract
Developing
cost‐effective,
high‐efficiency,
and
stable
electrocatalysts
for
the
hydrogen
evolution
reaction
(HER)
in
alkaline
electrolytes
is
of
critical
importance
realizing
renewable
technologies.
However,
sluggish
HER
kinetics
unsatisfied
stability
remain
challenges
their
practical
applications.
Herein,
a
hierarchically
porous
phosphorized
Pt‐Ni
nanohexapod/N‐doped
graphene
aerogel
(P‐PtNiNH/NGA)
constructed
by
an
oxidation‐phosphorization‐controlled
reconfiguration
strategy
presented.
It
enables
fast
water
dissociation
abundant
supply
ions,
strong
electron
interaction
optimal
intermediate
adsorption,
excellent
anchoring
effect
NGA
to
avoid
aggregation
Ostwald
ripening
PtNiNHs,
thus
exhibiting
superior
activity
exceptional
toward
HER.
The
P‐Pt
1
Ni
2
NH/NGA
exhibits
ultralow
overpotential
15
mV
at
current
density
10
mA
cm
−2
,
low
Tafel
slope
37
dec
−1
long‐term
stability,
which
are
commercial
Pt/C.
Moreover,
shows
high
mass
13.4
µg
large
TOF
value
13.5
s
100
mV,
8.8
times
9.0
higher
than
Pt/C
(under
same
Pt
loading
≈9.1
).
This
work
inspiration
catalyst
design
obtain
ideal
performance.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 28, 2024
Abstract
The
high
entropy
alloy
(HEA)
possesses
distinctive
thermal
stability
and
electronic
characteristics,
which
exhibits
substantial
potential
for
diverse
applications
in
electrocatalytic
reactions.
nanosize
of
HEA
also
has
a
significant
impact
on
its
catalytic
performance.
However,
accurately
controlling
synthesizing
small
nanomaterials
remains
challenge,
especially
the
ultrasmall
nanoparticles.
Herein,
we
firstly
calculate
illustrate
size
structure
as
well
adsorption
energies
crucial
intermediates
involved
typical
processes,
such
hydrogen
evolution
reaction
(HER),
oxygen
reduction
(ORR),
CO
2
electroreduction
(CO
RR)
NO
3
−
(NO
RR).
Under
guidance
theoretical
calculations,
synthesize
range
PtRuPdCoNi
nanoparticles
with
adjustable
sizes
(1.7,
2.3,
3.0,
3.9
nm)
using
one‐step
spatially
confined
approach,
without
any
further
treatment.
Experimentally,
smaller
HEAs
is
more
favorable
HER
ORR
performances,
aligning
predictions.
Specifically,
sized
at
1.7
nm
(HEA‐1.7)
endows
16
mV
overpotential
current
density
10
mA
cm
−2
,
yielding
mass
activity
31.9
A
mg
NM
−1
noble
metal
HER,
significantly
outperforming
commercial
Pt/C
catalyst.
This
strategy
can
be
easily
applicable
to
other
reactions
(e.g.
)
attributed
richness
components
adjustability,
presenting
promising
platform
various
advanced
catalysts.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 19, 2024
Abstract
High‐entropy‐alloy
(HEA)
nanocrystals
hold
immense
potential
for
catalysis,
offering
virtually
unlimited
alloy
combinations
through
the
inclusion
of
at
least
five
constituent
elements
in
varying
ratios.
However,
general
and
effective
strategies
synthesizing
libraries
HEA
with
controlled
surface
atomic
structures
remain
scarce.
In
this
study,
a
transferable
strategy
developing
library
facet‐controlled
seed@HEA
seed‐mediated
growth
is
presented.
The
synthesis
core–shell
incorporating
up
to
ten
different
metallic
elements,
control
over
number
solid‐solution
layers
demonstrated.
Epitaxial
on
nanocrystal
seeds
low‐index
high‐index
facets
leads
formation
catalyst
composition‐
facet‐dependent
catalytic
activities
both
electrocatalysis
photocatalysis.
situ
synchrotron
X‐ray
absorption
spectroscopy
density‐functional
theory
calculations
are
employed
identify
active
sites
HEA,
rationalizing
high
level
achieved.
This
work
enables
facet
engineering
multi‐elemental
chemical
space
unveils
critical
needs
their
future
development
toward
catalysis.
