ACS Catalysis,
Journal Year:
2024,
Volume and Issue:
14(7), P. 4523 - 4535
Published: March 12, 2024
Exploring
perovskite
oxide
electrocatalysts
with
high
activity
for
the
oxygen
evolution
reaction
(OER)
is
of
vital
importance
various
energy
conversion
processes.
Although
materials
proceeding
a
lattice
oxygen-mediated
mechanism-single
metal
site
mechanism
(LOM-SMSM)
could
break
inherent
theoretical
overpotential
ceiling
absorbent
(AEM),
fast
surface
remodeling
and
loss
are
still
huge
obstacles
hindering
robust
electrolysis.
Herein,
via
delicately
tuning
stoichiometry
precursor
dosage,
we
reported
hybrid
electrocatalyst
consisting
self-assembled
Ruddlesden–Popper
phases,
which
delivered
attractive
(overpotential
at
280
mV
10
mA/cm2)
durability
over
120
h.
As
compared
to
physically
mixed
counterparts,
self-configured
enjoyed
large
amount
defects,
doubled
exchange
rate.
Quasi
in
situ
X-ray
photoelectron
spectroscopy
(XPS)
further
demonstrated
reversibility
these
reactive
defects
(Vo..
↔
Olattice2–)
under
OER
working
potentials.
Further,
collective
differential
electrochemical
mass
spectrometry
(DEMS)
calculations
revealed
that
AB0.8
passed
through
more
optimal
path
mechanism-oxygen
vacancy
(LOM-OVSM)
happening
on
interface
tying
RP
perovskite,
elaborating
unique
stabilization
mechanism.
This
work
provides
rational
recipe
develop
highly
efficient
catalyst
oxidative
reactions.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(29), P. 20379 - 20390
Published: July 16, 2024
Scarce
and
expensive
iridium
oxide
is
still
the
cornerstone
catalyst
of
polymer-electrolyte
membrane
electrolyzers
for
green
hydrogen
production
because
its
exceptional
stability
under
industrially
relevant
oxygen
evolution
reaction
(OER)
conditions.
Earth-abundant
transition
metal
oxides
used
this
task,
however,
show
poor
long-term
stability.
We
demonstrate
here
use
nitrogen-doped
cobalt
as
an
effective
substitute.
The
exhibits
a
low
overpotential
240
mV
at
10
mA
cm–2
negligible
activity
decay
after
1000
h
operation
in
alkaline
electrolyte.
Incorporation
nitrogen
dopants
not
only
triggers
OER
mechanism
switched
from
traditional
adsorbate
route
to
lattice
oxidation
but
also
achieves
nonbonding
(ONB)
states
electron
donors,
thereby
preventing
structural
destabilization.
In
practical
anion-exchange
water
electrolyzer,
anode
delivers
current
density
1.78
V
electrical
efficiency
47.8
kW-hours
per
kilogram
hydrogen.
Advanced Science,
Journal Year:
2024,
Volume and Issue:
11(33)
Published: July 1, 2024
Abstract
Modifying
the
coordination
or
local
environments
of
single‐,
di‐,
tri‐,
and
multi‐metal
atom
(SMA/DMA/TMA/MMA)‐based
materials
is
one
best
strategies
for
increasing
catalytic
activities,
selectivity,
long‐term
durability
these
materials.
Advanced
sheet
supported
by
metal
atom‐based
have
become
a
critical
topic
in
fields
renewable
energy
conversion
systems,
storage
devices,
sensors,
biomedicine
owing
to
maximum
utilization
efficiency,
precisely
located
centers,
specific
electron
configurations,
unique
reactivity,
precise
chemical
tunability.
Several
offer
excellent
support
are
attractive
applications
energy,
medical
research,
such
as
oxygen
reduction,
production,
hydrogen
generation,
fuel
selective
detection,
enzymatic
reactions.
The
strong
metal–metal
metal–carbon
with
metal–heteroatom
(i.e.,
N,
S,
P,
B,
O)
bonds
stabilize
optimize
electronic
structures
atoms
due
interfacial
interactions,
yielding
activities.
These
provide
models
understanding
fundamental
problems
multistep
This
review
summarizes
substrate
structure‐activity
relationship
different
active
sites
based
on
experimental
theoretical
data.
Additionally,
new
synthesis
procedures,
physicochemical
characterizations,
biomedical
discussed.
Finally,
remaining
challenges
developing
efficient
SMA/DMA/TMA/MMA‐based
presented.
ACS Catalysis,
Journal Year:
2024,
Volume and Issue:
14(7), P. 4523 - 4535
Published: March 12, 2024
Exploring
perovskite
oxide
electrocatalysts
with
high
activity
for
the
oxygen
evolution
reaction
(OER)
is
of
vital
importance
various
energy
conversion
processes.
Although
materials
proceeding
a
lattice
oxygen-mediated
mechanism-single
metal
site
mechanism
(LOM-SMSM)
could
break
inherent
theoretical
overpotential
ceiling
absorbent
(AEM),
fast
surface
remodeling
and
loss
are
still
huge
obstacles
hindering
robust
electrolysis.
Herein,
via
delicately
tuning
stoichiometry
precursor
dosage,
we
reported
hybrid
electrocatalyst
consisting
self-assembled
Ruddlesden–Popper
phases,
which
delivered
attractive
(overpotential
at
280
mV
10
mA/cm2)
durability
over
120
h.
As
compared
to
physically
mixed
counterparts,
self-configured
enjoyed
large
amount
defects,
doubled
exchange
rate.
Quasi
in
situ
X-ray
photoelectron
spectroscopy
(XPS)
further
demonstrated
reversibility
these
reactive
defects
(Vo..
↔
Olattice2–)
under
OER
working
potentials.
Further,
collective
differential
electrochemical
mass
spectrometry
(DEMS)
calculations
revealed
that
AB0.8
passed
through
more
optimal
path
mechanism-oxygen
vacancy
(LOM-OVSM)
happening
on
interface
tying
RP
perovskite,
elaborating
unique
stabilization
mechanism.
This
work
provides
rational
recipe
develop
highly
efficient
catalyst
oxidative
reactions.
