Molecules,
Journal Year:
2024,
Volume and Issue:
29(24), P. 5845 - 5845
Published: Dec. 11, 2024
Metal
synergy
can
enhance
the
catalytic
performance,
and
a
prefabricated
solid
precursor
guide
ordered
embedding,
of
secondary
metal
source
ions
for
rapid
synthesis
bimetallic
organic
frameworks
(MM'-MOFs)
with
stoichiometric
ratio
1:1.
In
this
paper,
Co-MOF-1D
containing
well-defined
binding
sites
was
synthesized
by
mechanical
ball
milling,
which
used
as
template
induced
introduction
Fe
to
successfully
assemble
Co1Fe1-MOF-74@2
(where
@2
denotes
template-directed
MOF-74).
Its
electrocatalytic
performance
is
superior
that
conventional
one-step-synthesized
Co1Fe1-MOF-74@1
@1
one-step
MOF-74),
two
sources,
Co
Fe,
close
Meanwhile,
iron
valence
states
(FeII
FeIII)
in
were
further
regulated
obtain
materials
Co1Fe1(II)-MOF-74@2
Co1Fe1(III)-MOF-74@2.
The
electrochemical
test
results
confirm
state
has
better
than
Co1Fe1(III)-MOF-74@2
oxygen
evolution
reaction
(OER)
process.
This
phenomenon
related
gradual
increase
Co1Fe1(II)-MOF-74@2,
promotes
continuous
improvement
MOF
before
reaching
optimal
steady
makes
OER
reach
optimum
when
FeII/FeIII
mixed-valence
reaches
certain
proportion.
provides
new
idea
directed
optimization
highly
efficient
catalysts.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 14, 2025
Recently,
cobalt-based
oxides
have
received
considerable
attention
as
an
alternative
to
expensive
and
scarce
iridium
for
catalyzing
the
oxygen
evolution
reaction
(OER)
under
acidic
conditions.
Although
reported
materials
demonstrate
promising
durability,
they
are
not
entirely
intact,
calling
fundamental
research
efforts
understand
processes
governing
degradation
of
such
catalysts.
To
this
end,
work
studies
dissolution
mechanism
a
model
Co3O4
porous
catalyst
different
electrochemical
conditions
using
online
inductively
coupled
plasma
mass
spectrometry
(online
ICP-MS),
identical
location
scanning
transmission
electron
microscopy
(IL-STEM),
differential
(DEMS).
Despite
high
thermodynamics
tendency
reflected
in
Pourbaix
diagram,
it
is
shown
that
cobalt
kinetics
sluggish
can
be
lowered
further
by
modifying
protocol.
For
latter,
identified
study,
several
(electro)chemical
pathways
lead
must
considered.
Hence,
uncovers
transient
character
provides
valuable
insights
help
stability
already
published
works
facilitate
knowledge-driven
design
novel,
stable,
abundant
catalysts
toward
OER
environment.
International Journal of Molecular Sciences,
Journal Year:
2025,
Volume and Issue:
26(4), P. 1582 - 1582
Published: Feb. 13, 2025
Developing
a
highly
active
and
stable
catalyst
for
acidic
oxygen
evolution
reactions
(OERs),
the
key
half-reaction
proton
exchange
membrane
water
electrolysis,
has
been
one
of
most
cutting-edge
topics
in
electrocatalysis.
A
dual-doping
strategy
optimizes
electronic
environment,
modifies
coordination
generates
vacancies,
introduces
strain
effects
through
synergistic
effect
two
elements
to
achieve
high
catalytic
performance.
In
this
review,
we
summarize
progress
dual
doping
RuO2
or
IrO2
OERs.
The
three
main
mechanisms
OERs
are
dicussed
firstly,
followed
by
detailed
examination
development
history
catalysts,
from
experimentally
driven
systems
machine
learning
(ML)
theoretical
screening
systems.
Lastly,
provide
summary
remaining
challenges
future
prospects,
offering
valuable
insights
into
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 4, 2025
Abstract
Proton
exchange
membrane
water
electrolysis
(PEMWE)
represents
a
promising
technology
for
renewable
hydrogen
production.
However,
the
large‐scale
commercialization
of
PEMWE
faces
challenges
due
to
need
acid
oxygen
evolution
reaction
(OER)
catalysts
with
long‐term
stability
and
corrosion‐resistant
electrode
assemblies
(MEA).
This
review
thoroughly
examines
deactivation
mechanisms
acidic
OER
crucial
factors
affecting
assembly
instability
in
complex
environments,
including
catalyst
degradation,
dynamic
behavior
at
MEA
triple‐phase
boundary,
equipment
failures.
Targeted
solutions
are
proposed,
improvements,
optimized
designs,
operational
strategies.
Finally,
highlights
perspectives
on
strict
activity/stability
evaluation
standards,
situ/operando
characteristics,
practical
electrolyzer
optimization.
These
insights
emphasize
interrelationship
between
catalysts,
MEAs,
activity,
stability,
offering
new
guidance
accelerating
systems.
Chemical Communications,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
Electrocatalysis
is
key
to
realizing
a
sustainable
future
for
our
society.
However,
the
complex
interface
between
electrocatalysts
and
electrolytes
presents
an
ongoing
challenge
in
electrocatalysis,
hindering
accurate
identification
of
effective/authentic
structure-activity
relationships
determination
favourable
reaction
mechanisms.
Surface
coverage
reconstruction
analyses
are
important
address
each
conjecture
and/or
conflicting
viewpoint
on
surface-active
phases
their
corresponding
electrocatalytic
origin,
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 19, 2024
A
conventional
performance
metric
for
electrocatalysts
that
promote
the
oxygen
evolution
reaction
(OER)
is
current
density
at
a
given
overpotential.
However,
assumption
increased
lower
overpotentials
indicates
superior
catalyst
design
precarious
OER
catalysts
in
working
environment,
as
crystalline
lattice
prone
to
deconstruction
and
amorphization,
thus
greatly
increasing
concentration
of
catalytic
active
sites.
We
show
this
be
case
La3+
incorporation
into
Co3O4.
Powder
X-ray
diffraction
(PXRD),
Raman
spectroscopy
extended
absorption
fine
structure
(EXAFS)
reveal
smaller
domain
sizes
with
decreased
long-range
order
amorphization
La-modified
This
exacerbated
under
conditions
indicated
by
operando
spectroscopies.
The
overpotential
decreases
concentration,
maximum
activity
achieved
17%
La
incorporation.
HRTEM
images
electron
patterns
clearly
formation
an
amorphous
overlayer
during
catalysis
accelerated
addition.
O
1s
XPS
spectra
after
loss
lattice-oxide
increase
peak
intensities
associated
hydroxylated
or
defective
O-atom
environments,
consistent
Co(O)x(OH)y
species
overlayer.
Our
results
suggest
improved
oxides
incorporated
ions
(and
likely
other
metal
ions)
due
number
terminal
octahedral
edge
sites
upon
Co3O4
deconstruction,
rather
than
enhanced
intrinsic
catalysis.
Molecules,
Journal Year:
2025,
Volume and Issue:
30(5), P. 1046 - 1046
Published: Feb. 25, 2025
The
electrocatalysts
of
heteroatom-doped
non-precious
metal
oxide
materials
are
great
significance
for
efficient
and
low-cost
electrochemical
water-splitting
systems.
Herein,
an
innovative
Fe-doped
Co3O4
nanoflake
(Fe-Co3O4/NF)
on
nickel
foam
has
been
developed,
which
exhibits
excellent
electrocatalytic
activity
both
hydrogen
evolution
reactions
(HERs)
oxygen
(OERs).
Benefiting
from
the
synergy
charge
redistribution
d-band
center
shift
caused
by
doping
engineering,
as-obtained
Fe-Co3O4/NF
shows
HER
(η10
=
196
mV)
OER
290
activities
with
low
Tafel
slopes
(109
mV
dec-1
49
OER,
respectively)
stability.
This
work
provides
effective
method
designing
synthesizing
bifunctional
high
stability
hybrids
HER/OER.
