A-site
cation-deficient
strategy
is
proposed
to
develop
highly
active
perovskite
electrocatalysts
toward
hydrogen
evolution
reaction
(HER).
Herein,
La
and
Ba
co-deficient
(LaBa)1-xCo2O5+δ
perovskites
are
evaluated
as
the
potential
catalysts,
demonstrating
desirable
HER
performance
in
alkaline
media.
Noticeably,
(LaBa)0.95Co2O5+δ
(LBCO-95)
component
exhibits
an
overpotential
of
ca.
-415
mV
at
a
large
current
density
1000
mA
cm-2
disk,
along
with
extremely
steady
operation
during
continuous
process.
Furthermore,
Tafel
slope
(-47.4
dec-1)
LB-95
considerable
that
state-of-the-art
Pt/C
benchmark
(-25.2
dec-1).
This
activity
may
be
attributed
moderate
Co
valence
state
strong
affinity
H2O
species.
As
for
realistic
water
electrolysis,
Ni
foam
(NF)-supported
electrolyzer
LBCO-95
cathode
NiFe-layered
double
hydroxide
(NiFe-LDH)
anode
delivers
500
disk
1.97
V,
which
surpasses
classic
IrO2
couple.
Journal of Alloys and Metallurgical Systems,
Год журнала:
2024,
Номер
5, С. 100054 - 100054
Опубликована: Янв. 15, 2024
High-entropy
alloys
(HEAs)
are
one
of
the
breakthroughs
in
past
decade
alloy
development
that
have
potential
to
exhibit
outstanding
physical,
mechanical,
and
chemical
properties.
This
allows
HEAs
be
highly
versatile
materials
for
use
a
variety
applications.
Through
reasonable
composition
design
post-manufacturing
processes,
can
show
superior
properties
compared
traditional
alloys,
which
demanded
novel
emerging
technologies.
Severe
plastic
deformation
(SPD)
has
been
known
as
most
popular
processes
enhancing
mechanical
HEAs.
However,
there
is
still
lack
knowledge
about
microstructure,
subjected
SPD
processes.
review
concerned
with
production
nano/ultrafine-grained
using
techniques
such
severe
cold
rolling
(SCR),
high-pressure
torsion
(HPT),
equal
channel
angular
pressing
(ECAP).
Also,
characteristics
respect
demonstrated,
reduced
grain
growth
phase
decomposition.
These
increase
possibility
producing
nanostructured
high-entropy
(NsHEAs)
multiple
principal
elements
by
or
post-annealing
enable
extremely
high
superplasticity
at
strain
rates.
Finally,
these
findings
introduce
not
only
processing
tool
improve
physical
HEAs,
but
also
synthesis
fabricate
conventional
engineering
materials,
especially
high-tech
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 28, 2025
Abstract
Developing
sustainable
technologies
for
ammonia
production
through
electrochemical
reactions
offers
a
promising
alternative
by
leveraging
renewable
energy
sources
to
produce
under
ambient
conditions.
These
methods
include
nitrogen
reduction
reaction
(NRR),
nitric
oxide
(NORR),
nitrite
(NO
2
RR),
and
nitrate
3
RR).
Optimizing
efficiency
(EE)
in
synthesis
has
become
increasingly
crucial
as
commercialization
approaches.
Herein,
this
work
comprehensive
study
of
system
EE
improvements
the
theoretical
voltage
calculations
based
on
pH
expansion
bifunctional
catalysts
like
transition
metal
dichalcogenides
(TMDs),
which
can
efficiently
catalyze
oxygen
evolution
(OER)
synthesis.
The
review
summarizes
pH‐dependent
redox
potential
Pourbaix
diagrams
NRR,
NO
RR,
offering
insights
into
potential‐pH
regions
where
oxides
are
reduced
NH
.
Incorporating
design
enables
researchers
minimize
losses
better
improve
overall
performance.
Finally,
wraps
up
exploring
roles
TMD
different
mechanisms
identifying
areas
improvement.
broader
impact
lies
its
transform
alignment
with
global
efforts
reduce
greenhouse
gas
emissions.
Energy Technology,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 30, 2024
High
entropy
alloys
(HEAs)
have
attracted
substantial
attention
in
diverse
fields,
including
hydrogen
storage,
owing
to
their
unique
structural
and
functional
properties.
The
components
of
HEAs
made
them
a
focal
point
research,
aiming
develop
new
storage
materials
with
exceptional
comprehensive
present
study
provides
review
the
research
progress
technology
HEAs.
It
covers
microstructure
analysis,
theoretical
calculations,
performance
evaluation,
other
pertinent
applications.
Furthermore,
this
paper
introduces
hydrogen‐related
applications
while
also
addressing
current
challenges
issues
faced
by
researchers
field
for
technology.
Advanced Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 8, 2024
Accelerating
the
alkaline
hydrogen
evolution
reaction
(HER),
which
involves
slow
cleavage
of
HO-H
bonds
and
adsorption/desorption
(H*)
hydroxyl
(OH*)
intermediates,
requires
developing
catalysts
with
optimal
binding
strengths
for
these
intermediates.
Here,
unconventional
hexagonal
close-packed
(HCP)
high-entropy
alloy
(HEA)
atomic
layers
are
prepared
composed
five
platinum-group
metals
to
enhance
HER
synergistically.
The
breakthrough
is
made
by
layer-by-layer
heteroepitaxial
deposition
subnanometer
RuRhPdPtIr
HEA
on
HCP
Ru
seeds,
despite
thermodynamic
stability
Rh,
Pd,
Pt,
Ir
in
a
face-centered
cubic
(FCC)
structure
except
Ru.
synchrotron
X-ray
absorption
spectroscopy
(XAS)
confirms
mixing
coordination
environment
HEA.
Most
importantly,
they
exhibit
notable
improvements
both
electrocatalytic
activity
durability
an
environment,
as
compared
their
FCC
counterparts.
Electrochemical
measurements,
operando
XAS
analysis,
density
functional
theory
unveil
that
H*
OH*
intermediates
active
Pt
sites
can
be
weakened
strengthened
moderate
level,
respectively,
non-active
Ru,
Pd
atoms
within
strong
synergistic
electronic
effects.
Highlights in Science Engineering and Technology,
Год журнала:
2025,
Номер
125, С. 380 - 386
Опубликована: Фев. 18, 2025
High-entropy
alloy
(HEA)
nanocatalysts
have
garnered
increasing
attention
as
a
cutting-edge
solution
to
the
challenges
of
sustainable
hydrogen
production
via
water
splitting,
offering
significant
improvements
over
traditional
catalysts.
These
advanced
nanocatalysts,
composed
five
or
more
principal
elements,
exhibit
exceptional
catalytic
activity,
superior
thermal
and
electrochemical
stability,
notably
reduced
overpotential
for
both
evolution
reaction
(HER)
oxygen
(OER).
This
review
delves
into
synthesis
methodologies
HEA
including
their
structural
characterization,
while
highlighting
performance
in
electrolysis
green
production.
We
also
evaluate
scalability,
cost-effectiveness,
environmental
impact
these
comparing
them
conventional
systems.
Furthermore,
discusses
key
emerging
research
directions,
such
optimizing
elemental
composition
surface
properties
enhance
efficiency
address
commercialization
barriers.
Through
this
comprehensive
analysis,
we
aim
provide
insights
future
potential
promoting
energy
solutions.