Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 6, 2024
Abstract
The
sluggish
reaction
kinetics
of
the
anodic
oxygen
evolution
(OER)
and
inadequate
catalytic
performance
non‐noble
metal‐based
electrocatalysts
represent
substantial
barriers
to
development
anion
exchange
membrane
water
electrolyzer
(AEMWE).
This
study
performed
synthesis
a
three‐dimensional
(3D)
nanoflower‐like
electrocatalyst
(CFMO)
via
simple
one‐step
method.
substitution
Co
with
Fe
in
structure
induces
localized
oxide
path
mechanism
(LOPM),
facilitating
direct
O−O
radical
coupling
for
enhanced
O
2
evolution.
optimized
CFMO‐2
demonstrates
superior
OER
performance,
achieving
an
overpotential
217
mV
at
10
mA
cm
−2
,
alongside
exceptional
long‐term
stability
minimal
degradation
after
1000
h
operation
1.0
M
KOH.
These
properties
surpass
most
conventional
noble
electrocatalysts.
Furthermore,
assembled
AEMWE
system,
utilizing
CFMO‐2,
operates
cell
voltage
1.65
V
deliver
A
.
In
situ
characterizations
reveal
that,
addition
traditional
adsorbate
(AEM)
isolated
sites,
new
LOPM
occurred
around
bimetallic
sites.
First‐principles
calculations
confirm
greatly
reduced
energy
barriers.
work
highlights
potential
improving
design
AEMWE.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 6, 2024
Abstract
The
sluggish
reaction
kinetics
of
the
anodic
oxygen
evolution
(OER)
and
inadequate
catalytic
performance
non‐noble
metal‐based
electrocatalysts
represent
substantial
barriers
to
development
anion
exchange
membrane
water
electrolyzer
(AEMWE).
This
study
performed
synthesis
a
three‐dimensional
(3D)
nanoflower‐like
electrocatalyst
(CFMO)
via
simple
one‐step
method.
substitution
Co
with
Fe
in
structure
induces
localized
oxide
path
mechanism
(LOPM),
facilitating
direct
O−O
radical
coupling
for
enhanced
O
2
evolution.
optimized
CFMO‐2
demonstrates
superior
OER
performance,
achieving
an
overpotential
217
mV
at
10
mA
cm
−2
,
alongside
exceptional
long‐term
stability
minimal
degradation
after
1000
h
operation
1.0
M
KOH.
These
properties
surpass
most
conventional
noble
electrocatalysts.
Furthermore,
assembled
AEMWE
system,
utilizing
CFMO‐2,
operates
cell
voltage
1.65
V
deliver
A
.
In
situ
characterizations
reveal
that,
addition
traditional
adsorbate
(AEM)
isolated
sites,
new
LOPM
occurred
around
bimetallic
sites.
First‐principles
calculations
confirm
greatly
reduced
energy
barriers.
work
highlights
potential
improving
design
AEMWE.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 21, 2025
Abstract
Hydrogen
production
via
alkaline
seawater
electrolysis
represents
a
promising
strategy
for
future
sustainable
energy
development.
In
this
study,
FeCoP/TiN/CP(carbon
paper)
nanoarray
electrode
with
exceptional
hydrogen
evolution
reaction
(HER)
activity
and
durability
at
the
industrial
current
density
is
successfully
fabricated
by
engineering
electronic
coupling
N─transition
metal
(TM,
Co/Fe)─P
interfacial
bridge.
Remarkably,
FeCoP/TiN/CP
requires
only
an
overpotential
of
129
mV
(alkaline
fresh
water)
152
seawater)
to
achieve
500
mA
cm
−2
,
stable
operation
demonstrated
2000
h
in
freshwater
340
negligible
degradation.
The
superior
HER
performance
stems
from
unique
architecture
phase
interface
N─TM(Co/Fe)─P
bridge
bonding,
which
enhances
wettability,
facilitates
bubble
release,
provides
resistance
corrosion.
Theoretical
calculations
demonstrate
that
bridging
regulates
structure
FeCoP,
promoting
water
adsorption
dissociation,
while
optimizing
intermediate
H*
free
energy.
Furthermore,
covalent
nature
N‐TM(Co/Fe)‐P
bridging,
along
strengthened
Co/Fe‐P
bonds,
contributes
stability
FeCoP/TiN/CP.
This
study
not
new
insights
into
design
highly
active
heterostructure
electrocatalysts,
but
also
paves
way
practical
cost‐effective
electrolysis.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 24, 2025
Abstract
Alkaline‐based
anion
exchange
membrane
water
electrolysis
(AEMWE)
plays
a
crucial
role
in
sustainable
hydrogen
production.
However,
conventional
electrode
designs
rely
on
expensive
nickel‐based
materials
and
complex
fabrication
processes,
limiting
their
scalability.
This
study
presents
cost‐effective
scalable
approach
that
transforms
ultralow‐cost
steel
wool
into
freestanding
electrodes
for
industrial‐scale
AEMWE.
The
fibrous
structure,
anchoring
an
activated
nickel–iron
layered
double
hydroxide
catalyst,
enables
highly
active
bifunctional
electrode,
achieving
1
A
cm⁻
2
at
1.815
V
with
ultralow
degradation
rate
of
≈0.041
mV
h⁻¹
over
1800
h.
Unlike
electrodes,
the
interwoven
matrix
eliminates
need
porous
transport
layers
forms
interlocking
interface
membrane,
significantly
enhancing
performance
durability.
Under
industrial
conditions,
prototype
AEMWE
single
stack
(≈16
cm
)
delivers
16
1.8
nearly
30
2.0
V,
maintaining
stable
operation
400
h
under
dynamic
conditions.
iron‐rich
system,
based
one‐pot
corrosion
process,
upcycling
mass‐produced
m
scale
cost
4.59
USD
m⁻
,
200
times
cheaper
than
electrodes.
These
findings
establish
new
paradigm
cost‐efficient
durable
design
applications.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 24, 2024
Abstract
Developing
efficient
and
earth‐abundant
alkaline
HER
electrocatalysts
is
pivotal
for
sustainable
energy,
but
co‐regulating
its
intricate
multi‐step
process,
encompassing
water
dissociation,
OH
−
desorption,
hydrogen
generation,
still
a
great
challenge.
Herein,
we
tackle
these
obstacles
by
fabricating
vertically
integrated
electrode
featuring
nanosheet
array
with
prominent
dual‐nitride
metallic
heterostructures
characterized
impeccable
lattice
matching
excellent
conductivity,
functioning
as
multi‐purpose
catalyst
to
fine‐tune
the
bonding
affinity
intermediates.
Detailed
structural
characterization
theoretical
calculation
elucidate
that
charge
redistribution
at
heterointerface
reduces
O
p
‐W
d
H
s
interactions
vs.
single
nitride,
thereby
enhancing
transfer
2
release.
As
anticipated,
resulting
WN‐NiN/CFP
demonstrates
gratifying
low
overpotential
of
36.8
mV
10
mA/cm
HER,
while
concurrently
maintaining
operational
stability
1300
h
100
overall
splitting.
This
work
presents
an
effective
approach
meticulously
optimize
multiple
site‐intermediate
in
laying
foundation
energy
conversion.
