Inorganic Chemistry,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 22, 2024
By
utilizing
Metal-organic
framework
(MOF)
materials
as
a
base,
constructing
electrocatalysts
with
heterogeneous
structures
offers
advantages
for
catalyzing
water
splitting.
In
this
study,
hollow
nanocatalyst,
Ir-MIL-88A@NiFe-LDHs,
was
prepared
by
growing
layered
double
hydroxides
(LDHs)
shell
on
MIL-88A
substrate.
The
catalyst
shows
excellent
oxygen
evolution
reaction
(OER)
performance
in
1.0
M
KOH
solution,
requiring
only
217
mV
overpotential
to
achieve
current
density
of
10
mA
cm
Advanced Materials,
Год журнала:
2024,
Номер
36(27)
Опубликована: Апрель 19, 2024
Abstract
Single‐atom
catalysts
(SACs)
are
considered
prominent
materials
in
the
field
of
catalysis
due
to
their
high
metal
atom
utilization
and
selectivity.
However,
wide‐ranging
applications
SACs
remain
a
significant
challenge
complex
preparation
processes.
Here,
universal
strategy
is
reported
prepare
series
noble
single
atoms
on
different
non‐noble
oxides
through
facile
one‐step
thermal
decomposition
molten
salts.
By
using
mixture
nitrate
small‐amount
chloride
as
precursor,
can
be
easily
introduced
into
oxide
lattice
owing
cation
exchange
situ
formed
salt,
followed
by
anions
during
heating
process.
Analyses
aberration‐corrected
high‐angle
annular
dark‐field
scanning
transmission
electron
microscopy
extended
X‐ray
absorption
fine
structure
spectroscopy
confirm
formation
finely
dispersed
atoms.
Specially,
as‐synthesized
Ir
(10.97
wt%)
Pt
(4.60
Co
3
O
4
support
demonstrate
outstanding
electrocatalytic
activities
for
oxygen
evolution
reaction
hydrogen
reaction,
respectively.
Abstract
Developing
non‐precious‐metal
electrocatalysts
that
can
operate
with
a
low
overpotential
at
high
current
density
for
industrial
application
is
challenging.
Heterogeneous
bimetallic
phosphides
have
attracted
much
interest.
Despite
hydrogen
evolution
reaction
(HER)
performance,
the
ordinary
oxygen
(OER)
performance
hinders
their
practical
use.
Herein,
it
shown
Fe‐doping
reverses
and
enlarges
interfacial
electrical
field
heterojunction,
turning
H
intermediate
favorable
binding
sites
HER
into
O
OER.
Specifically,
self‐supported
heterojunction
catalysts
on
nickel
foam
(CoP@Ni
2
P/NF
Fe‐CoP@Fe‐Ni
P/NF)
are
readily
synthesized.
They
only
require
overpotentials
of
266
274
mV
to
drive
large
1000
mA
cm
−2
(
j
)
OER,
respectively.
Furthermore,
water
splitting
cell
equipped
these
electrodes
requires
voltage
1.724
V
excellent
durability,
demonstrating
potential
application.
This
work
offers
new
insights
engineering
catalysts.
Abstract
Most
advanced
hydrogen
evolution
reaction
(HER)
catalysts
show
high
activity
under
alkaline
conditions.
However,
the
performance
deteriorates
at
a
natural
and
acidic
pH,
which
is
often
problematic
in
practical
applications.
Herein,
rhenium
(Re)
sulfide–transition‐metal
dichalcogenide
heterojunction
catalyst
with
Re‐rich
vacancies
(NiS
2
‐ReS
‐V)
has
been
constructed.
The
optimized
shows
extraordinary
electrocatalytic
HER
over
wide
range
of
ultralow
overpotentials
42,
85,
122
mV
alkaline,
acidic,
neutral
conditions,
respectively.
Moreover,
two‐electrode
system
NiS
‐V
1
as
cathode
provides
voltage
1.73
V
500
mA
cm
−2
,
superior
to
industrial
systems.
Besides,
open‐circuit
single
Zn–H
O
cell
can
reach
an
impressive
90.9%
theoretical
value,
maximum
power
density
up
31.6
mW
.
it
remarkable
stability,
sustained
discharge
for
approximately
120
h
10
significantly
outperforming
commercial
Pt/C
same
conditions
all
aspects.
A
series
systematic
characterizations
calculations
demonstrate
that
Re
on
interface
would
generate
stronger
built‐in
electric
field,
profoundly
affects
surface
charge
distribution
subsequently
enhances
performance.
Advanced Materials Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 25, 2025
Abstract
This
review
highlights
recent
advancements
in
enhancing
oxygen
evolution
reaction
kinetics
through
the
design
of
single‐atom
catalysts.
By
leveraging
unique
properties
catalysts
(SACs),
including
high
atom
utilization
and
tunable
electronic
structures,
researchers
have
developed
with
superior
activity
stability
for
(OER).
Key
strategies
SACs
design,
such
as
support
selection,
coordination
environment,
doping
effects
are
discussed,
while
also
examining
role
advanced
characterization
techniques
elucidating
catalytic
mechanisms.
Finally,
future
directions
challenges
field
outlined
to
guide
development
next‐generation
OER
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 4, 2025
Abstract
Metal
oxyhydroxides
(MOOHs)
as
the
active
phase
of
transition
metal‐oxide
(TMOs)
electrodes
in
oxygen
evolution
reaction
(OER)
are
limited
by
unsatisfactory
electrochemical
activity
and
stability
during
high‐current
conditions.
Herein,
heterostructure
high‐valent
IrO
x
(Ir
n+
,
n>4)
combined
with
FeNi
3
OOH
via
asymmetric
electron
transport
is
deliberately
designed
on
carbon
cloth
(IrO
‐FeNi
OOH/CC)
a
promising
OER
electrocatalyst
for
industrial
deployments.
Experimental
DFT
calculations
reveal
that
transfer
from
Ir
to
low‐spin
orbital
Fe/Ni
sites
bridged
O
2−
(Ir─O─Ni/Fe
bonds)
at
interfaces
induces
formation
species.
This
process
tailors
d‐band
center
sites,
thereby
reducing
energy
barrier
rate‐determining
step
*
OER.
The
elevated
enables
OOH/CC
achieve
an
ultra‐low
overpotential
241
mV
200
mA
cm
−2
along
remarkable
160
h
under
large
current
conditions
(outperforming
commercial
2
/CC).
work
offers
basis
rationally
designing
analyzing
potential
role
precious‐metal‐based
electrocatalysts
related
processes.
