ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
17(1), С. 1350 - 1360
Опубликована: Дек. 18, 2024
The
sluggish
kinetics
of
the
anodic
process,
known
as
oxygen
evolution
reaction
(OER),
has
posed
a
significant
challenge
for
practical
application
proton
exchange
membrane
water
electrolyzers
in
industrial
settings.
This
study
introduces
high-performance
OER
catalyst
by
anchoring
iridium
oxide
nanoparticles
(IrO2)
onto
cobalt
(Co3O4)
substrate
via
two-step
combustion
method.
resulting
IrO2@Co3O4
demonstrates
enhancement
both
catalytic
activity
and
stability
acidic
environments.
Notably,
overpotential
required
to
attain
current
density
10
mA
cm–2,
commonly
used
benchmark
comparison,
is
merely
301
mV.
Furthermore,
maintained
over
duration
80
h,
confirmed
minimal
rise
overpotential.
Energy
spectrum
characterizations
experimental
results
reveal
that
generation
OER-active
Ir3+
species
on
surface
induced
strong
interaction
between
IrO2
Co3O4.
Theoretical
calculations
further
indicate
sites
loaded
Co3O4
have
lower
energy
barrier
*OOH
deprotonation
form
desorbed
O2.
Moreover,
this
also
stabilizes
active
maintaining
their
chemical
state,
leading
superior
long-term
stability.
These
insights
could
significantly
impact
strategies
designing
synthesizing
more
efficient
electrocatalysts
broader
application.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 14, 2025
The
development
of
superior
non-noble-metal-based
oxygen
evolution
reaction
(OER)
electrocatalysts
is
essential
for
large-scale
hydrogen
production.
In
this
study,
an
integrated
porous
nanosheet
Ni2P-Ni5P4
heterostructures
were
designed
as
excellent
OER
electrocatalyst.
synthesized
demonstrated
notable
activity,
achieving
a
small
overpotential
260
mV
to
sustain
typical
10
mA
cm-2
current
density,
along
with
exceptional
durability
over
2000
CV
cycles.
distinctive
structure
enhances
the
exposure
active
sites
and
improves
mass
transport
efficiency.
Density
functional
theory
(DFT)
calculations
revealed
that
d-band
center
Ni
was
shifted
downward,
reducing
adsorption
strength
critical
oxygen-containing
intermediates
(*O,
*OH,
*OOH)
in
heterostructures.
This
modification
lowered
barrier
rate-determining
step
(RDS)
involving
transformation
from
*O
*OOH,
thereby
boosting
inherent
activity.
Additionally,
partial
electron
localization
combination
RDS
intermediate
observed
by
functions
(ELFs)
Ni2P-Ni5P4,
weakening
overall
interaction.
Further
crystal
orbital
Hamiltonian
population
confirmed
reduced
Ni-O
net
bonding
energy
0.69
eV
adsorbed
compared
Ni2P
(1.49
eV)
Ni5P4
(1.12
aligning
DFT
ELF
findings.
These
results
provide
promising
approach
valuable
guidance
design
cost-effective
suitable
storage
applications,
including
metal-air
cells
water
oxidation
processes.
ABSTRACT
Carbon
electrocatalyst
materials
based
on
lignocellulosic
biomass
with
multi‐components,
various
dimensions,
high
carbon
content,
and
hierarchical
morphology
structures
have
gained
great
popularity
in
electrocatalytic
applications
recently.
Due
to
the
catalytic
deficiency
of
neutral
atoms,
usage
single
lignocellulosic‐based
electrocatalysis
involving
energy
storage
conversion
presents
unsatisfactory
applicability.
However,
atomic‐level
modulation
lignocellulose‐based
can
optimize
electronic
structures,
charge
separation,
transfer
processes,
so
forth,
which
results
substantially
enhanced
performance
carbon‐based
catalysts.
This
paper
reviews
recent
advances
rational
design
as
electrocatalysts
from
an
perspective,
such
self/external
heteroatom
doping
metal
modification.
Then,
through
systematic
discussion
principles
reaction
mechanisms
catalysts,
prepared
catalysts
rechargeable
batteries
are
reviewed.
Finally,
challenges
improving
prospects
diverse
review
contributes
synthesis
strategy
via
modulation,
turn
promotes
lignocellulose
valorization
for
conversion.
Redox
transformations
at
metal
oxide
(MOx)/solution
interfaces
are
broadly
important,
and
oxygen
atom
transfer
(OAT)
is
one
of
the
simplest
most
fundamental
examples
such
reactivity.
OAT
a
two-electron
process,
well-known
in
gas/solid
reactions
catalysis.
However,
rarely
directly
observed
oxide/water
interfaces,
whose
redox
typically
proposed
to
occur
one-electron
steps.
Reported
here
stoichiometric
organic
molecules
with
aqueous
colloidal
titanium
dioxide
iridium
nanoparticles
(TiO2
IrOx
NPs).
Me2SO
(DMSO)
oxidizes
reduced
TiO2
NPs
formation
Me2S,
O
atoms
water-soluble
phosphine
thioether.
The
reaction
stoichiometries
were
established
chemical
mechanisms
probed
using
typical
solution
spectroscopic
techniques,
exploiting
high
surface
areas
transparency
colloids.
These
reactions,
including
catalytic
example,
utilize
ability
individual
accumulate
many
electrons
and/or
holes.
Observing
two
different
materials,
opposite
directions,
step
toward
harnessing
for
valuable
multi-electron
multi-hole
transformations.
Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 12, 2025
The
interest
in
aqueous
energy
storage
devices
is
surging
due
to
their
exceptional
safety
profile.
However,
systems,
interfacial
side
reactions,
predominantly
attributed
the
oxygen
evolution
reaction
(OER),
result
significant
self-discharge,
which
concomitant
with
deterioration
of
both
voltage
and
capacity.
Herein,
we
propose
construction
a
ferrocyanide
"skin"
on
transition
metal
compounds
(TMCs)
mitigate
this
issue.
This
engineered
creates
Fe–C≡N
terminations,
initiating
new
pathway
featured
by
bonding
process
N–O
N–H
bonds.
presents
barrier,
effectively
shielding
active
sites
for
OER
from
H2O
molecules
hydroxyl
ions.
Taking
NiO
as
an
example,
suppresses
undesired
phase
NiOOH
Ni(OH)2
during
idling
fully
charged
electrode,
enabling
as-modified
electrode
achieve
remarkable
retention
80.0%
after
1
week
within
device.
Furthermore,
concept
demonstrates
extensive
applicability,
extending
range
TMC
materials,
including
but
not
limited
manganese
oxide,
vanadium
nickel
cobalt
oxide.
These
findings
highlight
efficacy
design
strategy
broadly
applicable
paradigm
suppressing
H2O-induced
undesirable
transitions
devices.
Chemical Society Reviews,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
This
review
examines
the
strategies
of
symmetry
breaking
(charge/coordination/geometric)
in
single-atom
catalysts
to
regulate
active
site
electronic
structures,
greatly
enhancing
catalytic
performance.
