Optimizing the Electronic Structure of IrOx Sub-2 nm Clusters via Tunable Metal Support Interaction for Acidic Oxygen Evolution Reaction
ACS Catalysis,
Год журнала:
2025,
Номер
15(3), С. 1942 - 1951
Опубликована: Янв. 17, 2025
Iridium-based
electrocatalysts
are
the
most
promising
candidates
for
acidic
oxygen
evolution
reaction
(OER).
Considering
their
high
cost
and
scarcity,
it
is
imperative
to
maximize
atom
utilization
enhance
intrinsic
activity
of
iridium.
In
this
work,
IrOx
sub-2
nm
clusters
stabilized
on
TiO2
supports
via
metal
support
interaction
(MSI)
induced
by
vacancy
defects
in
TiO2.
The
strength
MSI
readily
tuned
type
vacancies:
vacancies
(VO-TiO2)
induce
adsorbed
with
relatively
weak
strength,
while
titanium
(VTi-TiO2)
lead
strong
embedded
MSI.
tunable
further
modulates
electronic
structure
clusters.
IrOx/VO-TiO2
exhibits
an
optimized
a
downshifted
d-band
center
IrOx,
resulting
reduced
binding
energy
low
barrier
rate-determining
step
OER.
Consequently,
delivers
twice
that
commercial
IrO2
good
stability
120
h
practical
proton
exchange
membrane
water
electrolyzer.
Our
study
provides
guideline
rational
design
OER
catalysts
based
modulating
Язык: Английский
High-Entropy Ultrathin Amorphous Metal–Organic Framework-Stabilized Ru(Mo) Dual-Atom Sites for Water Oxidation
ACS Energy Letters,
Год журнала:
2024,
Номер
unknown, С. 5763 - 5770
Опубликована: Ноя. 6, 2024
High-entropy
metal–organic
frameworks
(HE-MOFs)
offer
immense
potential
in
electrocatalysis
due
to
their
diverse
metallic
compositions
and
high
densities
of
active
sites.
Integrating
bimetallic
single-atom
catalysts
(SACs)
with
HE-MOFs
for
enhanced
oxygen
evolution
reaction
(OER)
performance
remains
challenging.
Here,
we
stabilize
atomically
dispersed
Ru
Mo
amorphous
HE-MOF
nanosheets
(HE(Ru,Mo)-MOFs)
via
situ-formed
high-entropy
oxides,
elucidating
the
deprotonation
mechanism.
Evidence
supports
presence
high-density
O-bridged
dual-atom
The
multimetallic
composition
induces
electronic
redistribution
balances
oxidation
state
metal
sites,
enhancing
intrinsic
OER
activity.
HE(Ru,Mo)-MOFs
exhibit
low
overpotentials
267
mV@10
mA
cm–2
266
alkaline
freshwater
industrial
wastewater,
respectively,
exceptional
durability
surpassing
that
commercial
RuO2
catalysts.
Mechanistic
insights
reveal
atomic
dispersion
facilitates
rapid
charge
transfer
intermediate
transformation,
promising
advanced
energy
conversion.
Язык: Английский
MXene‐Enhanced Metal–Organic Framework‐Derived CoP Nanocomposites as Highly Efficient Trifunctional Electrocatalysts for OER, HER, and ORR
Advanced Energy and Sustainability Research,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 2, 2025
Developing
robust
active
electrocatalysts
from
readily
available
earth‐abundant
elements
for
oxygen
evolution
reaction
(OER),
hydrogen
(HER),
and
reduction
(ORR)
remains
an
unresolved
challenge.
Herein,
Ti
3
C
2
T
x
MXene‐containing
metal–organic
framework‐derived
CoP
nanocomposite
are
successfully
prepared
by
phosphidation
of
in
situ‐produced
ZIF‐67/MXene
composite
precursor
at
various
heat
treatment
temperatures.
The
obtained
catalysts
characterized
X‐ray
diffraction,
Brunauer–Emmett–Teller,
photoelectron
spectroscopy,
field
emission‐scanning
electron
microscope/energy
dispersive
spectroscopy
(EDS),
high‐resolution
transmission
microscopy/EDS.
In
the
produced
composites,
MXene
functions
as
a
supportive
substrate
to
facilitate
mass
transfer,
well
ion
transport,
improve
electrical
conductivity.
Moreover,
introduction
into
heterostructured
CoP@C/Ti
enables
it
expose
provide
extra
sites
electrochemical
reactions.
as‐prepared
CoP@C/MXene‐360
(abbreviated
CPMX‐360)
is
promising
trifunctional
electrocatalyst
toward
OER,
HER,
ORR.
CPMX‐360
exhibits
excellent
electrocatalytic
activity
with
overpotential
235
mV
10
mA
cm
−2
220
−10
E
onset
1/2
0.82
0.74
V
ORR,
respectively.
This
research
provides
viable
method
develop
nonprecious
via
framework
performance
Язык: Английский
2D Metastable‐Phase Hafnium Oxide Triggers Hydrogen Spillover for Boosting Hydrogen Production
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 27, 2025
Abstract
Hydrogen
(H)
manipulation
plays
a
significantly
important
role
in
many
applications,
which
the
occurrence
of
hydrogen
spillover
generally
shows
substrate‐dependent
behavior.
It
therefore
remains
an
open
question
about
how
to
trigger
on
substrates
that
are
forbidden.
Here
new
metastable‐phase
2D
edge‐sharing
oxide:
six‐hexagonal
phase‐hafnium
oxide
(Hex‐HfO
2
,
space
group:
P6
3
mc
(186))
with
coordination
number
six
is
demonstrated,
serves
as
ideal
platform
for
activating
efficient
after
loading
Ru
nanoclusters
(Ru/Hex‐HfO
).
For
stark
comparison,
strongly
forbidden
when
using
stable
monoclinic
phase
HfO
(M‐HfO
P2
1
/c
(14),
number:
seven)
substrate.
When
applied
acidic
evolution
reaction
(HER),
Ru/Hex‐HfO
exhibits
low
overpotential
8
mV
at
10
mA
cm
−2
and
high
utilization
activity
14.37
A
mg
−1
30
mV.
Detailed
mechanism
reveals
positive
H
adsorption
free
energy
Hex‐HfO
indicating
more
likely
.
Furthermore,
strong
interaction
between
optimizes
desorption
intermediate,
thus
facilitating
surface
spillover.
The
discovery
provides
guidance
developing
advanced
catalysis.
Язык: Английский
Constructing CoP/Ni2P Heterostructure Confined Ru Sub‐Nanoclusters for Enhanced Water Splitting in Wide pH Conditions
Advanced Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 11, 2024
Abstract
Developing
efficient
electrocatalysts
for
water
splitting
is
of
great
significance
realizing
sustainable
energy
conversion.
In
this
work,
Ru
sub‐nanoclusters
anchored
on
cobalt‐nickel
bimetallic
phosphides
(Ru‐CoP/Ni
2
P)
are
constructed
by
an
interfacial
confinement
strategy.
Remarkably,
Ru‐CoP/Ni
P
with
low
noble
metal
loading
(33.1
µg
cm
−2
)
shows
superior
activity
hydrogen
evolution
reaction
(HER)
in
all
pH
values,
whose
turnover
frequency
(TOF)
8.7,
15.3,
and
124.7
times
higher
than
that
Pt/C
acidic,
alkaline,
neutral
conditions,
respectively.
Meanwhile,
it
only
requires
the
overpotential
171
mV@10
mA
oxygen
(OER)
corresponding
TOF
20.3
RuO
.
More
importantly,
P||Ru‐CoP/Ni
displays
mass
4017
mg
−1
at
2.0
V
flowing
alkaline
electrolyzer,
which
105.1
Pt/C||IrO
situ
Raman
spectroscopy
demonstrates
sites
play
a
key
role
follow
adsorption
mechanism
toward
OER.
Further
studies
disclose
confined
atom
contributes
to
desorption
H
during
HER
formation
O‐O
bond
OER,
leading
fast
kinetics.
This
study
emphasizes
importance
interface
enhancing
electrocatalytic
activity.
Язык: Английский
Applications, performance-enhancement strategies and prospects of NixPy in electrocatalysis
Materials Horizons,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Developing
low-cost
and
high-efficiency
electrocatalysts
is
the
key
to
making
energy-related
electrocatalytic
technologies
commercially
feasible.
In
recent
years,
nickel
phosphide
(NixPy)
have
received
extensive
attention
due
their
multiple
active
sites,
adjustable
structure
composition,
unique
physicochemical
properties.
this
review,
latest
progress
of
NixPy
in
field
electrocatalysis
reviewed
from
aspects
properties
NixPy,
different
synthesis
methods,
ingenious
modulation
strategies.
The
significant
enhancement
effects
elemental
doping,
vacancy
defect,
interfacial
engineering,
synergistic
effect,
external
magnetic
excitation-enhanced
strategy
on
performance
are
emphasized,
Moreover,
a
forward-looking
outlook
for
its
future
development
direction
provided.
Finally,
some
basic
problems
research
directions
energy
presented.
Язык: Английский