Oxygen
evolution
reactions
(OER),
commonly
employed
in
applications
such
as
metal-air
batteries,
water
electrolysis,
fuel
cells,
etc.
,
often
suffer
from
slow
kinetics,
thus
leading
to
ultra-high
potentials
that
severely
affect
device
energy
efficiency.
Metal-organic
frameworks
(MOFs)
have
garnered
massive
attention
electrodes
for
OER,
benefiting
their
highly
ordered
porous
frameworks,
abundant
accessible
active
metal
sites,
and
adjustable
lattice
structures.
However,
using
powdered
MOFs
OER
poses
a
challenge,
limiting
the
exposure
of
numerous
sites
resulting
suboptimal
To
address
this
limitation,
trend
towards
designing
MOF-based
self-supported
with
enhanced
contact
between
current
collector
has
gained
considerable
applications.
This
review
highlights
recent
advancements
future
prospects
developing
OER.
We
delve
into
various
aspects,
including
preparation
methods,
optimization
strategies,
catalytic
efficiencies,
mechanisms
electrocatalysts.
Furthermore,
we
explore
existing
challenges
associated
comprehensive
overview
provides
valuable
insights
evolving
landscape
materials
advancing
ACS Nano,
Год журнала:
2024,
Номер
18(31), С. 20459 - 20467
Опубликована: Июль 22, 2024
Inducing
strain
in
the
lattice
effectively
enhances
intrinsic
activity
of
electrocatalysts
by
shifting
metal's
d-band
center
and
tuning
binding
energy
reaction
intermediates.
NiFe-layered
double
hydroxides
(NiFe
LDHs)
are
promising
for
oxygen
evolution
(OER)
due
to
their
cost-effectiveness
high
catalytic
activity.
The
distorted
β-NiOOH
phase
produced
Jahn-Teller
effect
under
oxidation
polarization
is
known
exhibit
superior
activity,
but
it
eventually
transforms
undistorted
γ-NiOOH
during
OER
process.
Such
a
reversible
distortion
limits
In
this
study,
we
propose
facile
boron
tungstate
(BWO)
anion
intercalation
method
induce
irreversible
NiFe
LDHs,
leading
significantly
enhanced
Strong
interactions
with
BWO
anions
significant
stress
on
LDH's
metal-hydroxide
slab,
an
expansion
metal-oxygen
bonds
subsequent
distortion.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
17(9), С. 13794 - 13803
Опубликована: Фев. 24, 2025
Glycerol
electrooxidation
(GOR),
as
a
typical
nucleophilic
biomass
oxidation
reaction,
provides
promising
anodic
alternative
for
coupling
green
hydrogen
generation
at
the
cathode.
However,
challenges
of
identifying
active
sites
and
elucidating
reaction
mechanisms
greatly
limit
design
high-performance
catalysts.
Herein,
we
use
NiO
Ni/NiO
model
catalysts
to
investigate
glycerol
oxidation.
Electrochemical
measurements
operando
spectroscopic
studies
uncovered
that
Ni2+/Ni3+
species
are
true
GOR
lower
potentials.
formed
on
surface
were
easily
converted
Ni4+
(NiO2)
higher
potentials,
which
not
only
contributed
overoxidation
electrolysis
products
but
also
worked
main
competitive
oxygen
evolution
(OER),
resulting
in
rapid
decay
Faradic
efficiencies
(FEs)
high
Interestingly,
Ni/NiO,
Ni3+
surface.
Experimental
density
functional
theory
(DFT)
investigations
indicated
due
relatively
average
valence
state
Ni
strong
electronic
interaction
interface,
reconstruction
was
effectively
manipulated.
Only
→
NiOOH
(Ni3+)
transformation
observed,
formation
suppressed.
As
result,
delivered
superior
activity,
FE
did
drop
apparently
This
work
offers
mechanistic
insight
into
how
identify
maintain
catalytic
materials
value-added
nucleophile
reactions.
Coatings,
Год журнала:
2025,
Номер
15(5), С. 534 - 534
Опубликована: Апрель 30, 2025
Tailoring
the
microstructural
heterogeneity
of
metallic
coatings
is
a
promising
strategy
for
enhancing
their
corrosion
resistance;
however,
its
systematic
optimization
remains
underexplored.
Here
in,
we
present
one-step,
scalable
electrodeposition
to
fabricate
Ni
with
tunable
nanocrystalline
heterostructures
on
Cu
substrates
by
varying
current
density
from
1
mA/cm2
50
mA/cm2.
The
coating
10
mA/cm2,
featuring
heterogeneous
nanograin
structure
coexisting
small
and
large
grains,
exhibited
optimal
resistance
in
3.5
wt.%
NaCl
solution,
low
self-corrosion
4.48
µA/cm2.
Electrochemical
impedance
spectroscopy
(EIS)
molecular
dynamics
(MD)
simulations
revealed
that
heterostructure
dispersed
Cl−
adsorption
sites
promoted
passivation.
High-resolution
transmission
electron
microscopy
(HRTEM)
as
increased
product
transitioned
crystalline
NiOOH
an
amorphous
structure,
which
correlated
reduced
resistance.
microstructure
enhances
durability,
offering
cost-effective
alloy-free
alternative
offshore
applications.
These
findings
provide
theoretical
experimental
basis
designing
advanced
corrosion-resistant
coatings.
