Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 9, 2025
Abstract
Understanding
the
phase
structure‐dependent
catalytic
performance
is
of
great
significance
for
investigation
advanced
electrocatalysts.
At
present,
research
in
engineering
metal
materials
electrocatalysis
predominantly
concentrates
on
iron
group,
platinum
and
coinage
group
metals
with
A1‐,
A2‐,
A3‐
type
structures.
However,
beyond
above
other
types
structures
still
poorly
explored.
Herein,
using
tungsten
as
a
substrate
to
support
iridium,
it
shown
that
iridium‐embedded
diverse
crystal
structure
(referred
Ir/α‐W
A2‐type
Ir/β‐W
A‐15
structure)
exhibits
distinct
activity
hydrogen
oxidation
reactions
(HOR)
alkaline
medium.
Notably,
mass‐normalized
exchange
current
density
(j
0,
m
)
noble
iridium
(518.3
A
g
−1
Ir
≈1.8
times
16.4
higher
than
Ir/C,
respectively.
In‐depth
mechanistic
studies
suggest
enhanced
HOR
attributed
connectivity
H‐bond
network
well
synergistic
optimization
adsorption
binding
energies
H
OH
intermediate
species.
This
study
can
inspire
more
scientific
interest
exploration
electrocatalysis.
We
report
a
catalyst
family
of
high-entropy
alloy
(HEA)
atomic
layers
having
three
elements
from
iron-group
metals
(IGMs)
and
two
platinum-group
(PGMs).
Ten
distinct
quinary
compositions
IGM-PGM-HEA
with
precisely
controlled
square
arrangements
are
used
to
explore
their
impact
on
hydrogen
evolution
reaction
(HER)
oxidation
(HOR).
The
PtRuFeCoNi
perform
enhanced
catalytic
activity
durability
toward
HER
HOR
when
benchmarked
against
the
other
commercial
Pt/C
catalysts.
Operando
synchrotron
x-ray
absorption
spectroscopy
density
functional
theory
simulations
confirm
cocktail
effect
arising
multielement
composition.
This
optimizes
hydrogen-adsorption
free
energy
contributes
remarkable
observed
in
PtRuFeCoNi.
In
situ
electron
microscopy
captures
phase
transformation
metastable
during
annealing
process.
They
transform
random
mixing
(25°C),
ordered
L1
Angewandte Chemie,
Год журнала:
2024,
Номер
136(12)
Опубликована: Янв. 30, 2024
Abstract
Efficient
dual‐single‐atom
catalysts
are
crucial
for
enhancing
atomic
efficiency
and
promoting
the
commercialization
of
fuel
cells,
but
addressing
sluggish
kinetics
hydrogen
oxidation
reaction
(HOR)
in
alkaline
media
facile
site
generation
remains
formidable
challenges.
Here,
we
break
local
symmetry
ultra‐small
ruthenium
(Ru)
nanoparticles
by
embedding
cobalt
(Co)
single
atoms,
which
results
release
Ru
atoms
from
on
reduced
graphene
oxide
(Co
1
1,n
/rGO).
In
situ
operando
spectroscopy
theoretical
calculations
reveal
that
oxygen‐affine
Co
atom
disrupts
nanoparticles,
resulting
parasitic
within
nanoparticles.
The
interaction
between
forms
effective
active
centers.
parasitism
modulates
adsorption
OH
intermediates
sites,
accelerating
HOR
through
faster
formation
*H
2
O.
As
anticipated,
/rGO
exhibits
ultrahigh
mass
activity
(7.68
A
mg
−1
)
at
50
mV
exchange
current
density
(0.68
mA
cm
−2
),
6
7
times
higher
than
those
Ru/rGO,
respectively.
Notably,
it
also
displays
exceptional
durability
surpassing
commercial
Pt
catalysts.
This
investigation
provides
valuable
insights
into
hybrid
multi‐single‐atom
metal
nanoparticle
catalysis.
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(18), С. 6594 - 6605
Опубликована: Янв. 1, 2024
Strong
transboundary
electron
transfer
in
high-entropy
quantum-dots
significantly
accelerates
the
Tafel
kinetics
HER,
which
effectively
reduces
cost
of
cathode
catalyst
proton
exchange
membrane
water
electrolysis
(PEMWE).
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 9, 2025
Abstract
Understanding
the
phase
structure‐dependent
catalytic
performance
is
of
great
significance
for
investigation
advanced
electrocatalysts.
At
present,
research
in
engineering
metal
materials
electrocatalysis
predominantly
concentrates
on
iron
group,
platinum
and
coinage
group
metals
with
A1‐,
A2‐,
A3‐
type
structures.
However,
beyond
above
other
types
structures
still
poorly
explored.
Herein,
using
tungsten
as
a
substrate
to
support
iridium,
it
shown
that
iridium‐embedded
diverse
crystal
structure
(referred
Ir/α‐W
A2‐type
Ir/β‐W
A‐15
structure)
exhibits
distinct
activity
hydrogen
oxidation
reactions
(HOR)
alkaline
medium.
Notably,
mass‐normalized
exchange
current
density
(j
0,
m
)
noble
iridium
(518.3
A
g
−1
Ir
≈1.8
times
16.4
higher
than
Ir/C,
respectively.
In‐depth
mechanistic
studies
suggest
enhanced
HOR
attributed
connectivity
H‐bond
network
well
synergistic
optimization
adsorption
binding
energies
H
OH
intermediate
species.
This
study
can
inspire
more
scientific
interest
exploration
electrocatalysis.
