Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 9, 2024
Abstract
Spinel
oxides
have
emerged
as
highly
active
catalysts
for
the
oxygen
evolution
reaction
(OER).
Owing
to
covalency
competition,
OER
process
on
spinel
often
follows
an
arduous
adsorbate
mechanism
(AEM)
pathway.
Herein,
we
propose
a
novel
rare‐earth
sites
substitution
strategy
tune
lattice
redox
of
and
bypass
AEM
scaling
relationship
limitation.
Taking
NiCo
2
O
4
model,
incorporation
Ce
into
octahedral
site
induces
formation
Ce−O−M
(M=Ni,
Co)
bridge,
which
triggers
charge
redistribution
within
.
The
developed
Ce−NiCo
exhibits
remarkable
activity
with
low
overpotential,
satisfactory
electrochemical
stability,
good
practicability
in
anion‐exchange
membrane
water
electrolyzer.
Theoretical
analyses
reveal
that
surface
more
favorable
(LOM)
pathway
non‐concerted
proton‐electron
transfers
compared
pure
,
also
verified
by
pH‐dependent
behavior
situ
Raman
analysis.
18
O‐labeled
mass
spectrometry
provides
direct
evidence
released
during
originates
from
We
discover
electron
delocalization
f
states
through
favoring
antibonding
state
occupation
Ni−O
bonding
[Ce−O−Ni]
unit
site,
thereby
activating
OER.
This
work
new
perspective
designing
offers
significant
insights
rare‐earth‐enhanced
LOM
mechanism.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(9), P. 4931 - 4970
Published: Jan. 1, 2024
The
fabrication
strategies
of
mesopores
and
macropores
in
metal–organic
frameworks
(MOFs)
their
emerging
applications
are
summarized.
In
addition,
the
challenges
future
perspectives
pore
engineering
MOF
design
also
indicated.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(28)
Published: April 25, 2024
Abstract
The
high
cost
of
proton
exchange
membrane
water
electrolysis
(PEMWE)
originates
from
the
usage
precious
materials,
insufficient
efficiency,
and
lifetime.
In
this
work,
an
important
degradation
mechanism
PEMWE
caused
by
dynamics
ionomers
over
time
in
anode
catalyst
layer
(ACL),
which
is
a
purely
mechanical
microstructure,
identified.
Contrary
to
conventional
understanding
that
microstructure
ACL
static,
micropores
are
inclined
be
occupied
due
localized
swelling/creep/migration,
especially
near
ACL/PTL
(porous
transport
layer)
interface,
where
they
form
channels
reactant/product
couples.
Consequently,
with
increased
at
PTL/ACL
interface
exhibit
rapid
continuous
degradation.
addition,
close
correlation
between
ink
discovered.
Specifically,
if
more
migrate
top
ink,
accumulate
ACL/PEM
leaving
fewer
interface.
Therefore,
ionomer
distribution
successfully
optimized,
exhibits
reduced
enriches
reducing
decay
rate
factor
three
when
operated
2.0
A
cm
−2
80
°C.
findings
provide
general
way
achieve
low‐cost
hydrogen
production.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Nov. 28, 2024
The
development
of
efficient
and
stable
electrocatalysts
for
water
oxidation
in
acidic
media
is
vital
the
commercialization
proton
exchange
membrane
electrolyzers.
In
this
work,
we
successfully
construct
Ru–O–Ir
atomic
interfaces
oxygen
evolution
reaction
(OER).
catalysts
achieve
overpotentials
as
low
167,
300,
390
mV
at
10,
500,
1500
mA
cm−2
0.5
M
H2SO4,
respectively,
with
electrocatalyst
showing
robust
stability
>1000
h
operation
10
negligible
degradation
after
200,000
cyclic
voltammetry
cycles.
Operando
spectroelectrochemical
measurements
together
theoretical
investigations
reveal
that
OER
pathway
over
active
site
near-optimal,
where
bridging
Ir–OBRI
serves
acceptor
to
accelerate
transfer
on
an
adjacent
Ru
centre,
breaking
typical
adsorption-dissociation
linear
scaling
relationship
a
single
thus
enhancing
activity.
Here,
show
rational
design
multiple
sites
can
break
activity/stability
trade-off
commonly
encountered
catalysts,
offering
good
approaches
towards
high-performance
catalysts.
Efficient
are
essential
authors
report
enable
oxygen-mediated
deprotonation
pathways,
overcoming
evolution.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 13, 2024
The
development
of
a
highly
active
and
stable
oxygen
evolution
reaction
(OER)
electrocatalyst
is
desirable
for
sustainable
efficient
hydrogen
production
via
proton
exchange
membrane
water
electrolysis
(PEMWE)
powered
by
renewable
electricity
yet
challenging.
Herein,
we
report
robust
Pt/Ru-codoped
spinel
cobalt
oxide
(PtRu-Co
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 9, 2024
Abstract
Spinel
oxides
have
emerged
as
highly
active
catalysts
for
the
oxygen
evolution
reaction
(OER).
Owing
to
covalency
competition,
OER
process
on
spinel
often
follows
an
arduous
adsorbate
mechanism
(AEM)
pathway.
Herein,
we
propose
a
novel
rare‐earth
sites
substitution
strategy
tune
lattice
redox
of
and
bypass
AEM
scaling
relationship
limitation.
Taking
NiCo
2
O
4
model,
incorporation
Ce
into
octahedral
site
induces
formation
Ce−O−M
(M=Ni,
Co)
bridge,
which
triggers
charge
redistribution
within
.
The
developed
Ce−NiCo
exhibits
remarkable
activity
with
low
overpotential,
satisfactory
electrochemical
stability,
good
practicability
in
anion‐exchange
membrane
water
electrolyzer.
Theoretical
analyses
reveal
that
surface
more
favorable
(LOM)
pathway
non‐concerted
proton‐electron
transfers
compared
pure
,
also
verified
by
pH‐dependent
behavior
situ
Raman
analysis.
18
O‐labeled
mass
spectrometry
provides
direct
evidence
released
during
originates
from
We
discover
electron
delocalization
f
states
through
favoring
antibonding
state
occupation
Ni−O
bonding
[Ce−O−Ni]
unit
site,
thereby
activating
OER.
This
work
new
perspective
designing
offers
significant
insights
rare‐earth‐enhanced
LOM
mechanism.
