Small,
Journal Year:
2021,
Volume and Issue:
18(2)
Published: Nov. 12, 2021
Water
splitting
is
a
promising
sustainable
technology
to
produce
high
purity
hydrogen,
but
its
commercial
application
remains
giant
challenge
due
the
kinetically
sluggish
oxygen
evolution
reaction
(OER).
In
this
work,
time-
and
energy-saving
approach
directly
grow
NiFe-layered
double
hydroxide
(NiFe-LDH)
nanosheets
on
nickel
foam
under
ambient
temperature
pressure
reported.
These
NiFe-LDH
are
vertically
rooted
in
interdigitated
together
form
highly
porous
array,
leading
numerous
exposed
active
sites,
reduced
resistance
of
charge/mass
transportation
enhanced
mechanical
stability.
As
self-supported
electrocatalyst,
representative
sample
([email protected])
shows
an
excellent
large-current-density
catalytic
activity
for
OER
alkaline
electrolyte,
requiring
low
overpotentials
190
220
mV
reach
current
densities
100
657
mA
cm-2
with
Tafel
slope
38.1
dec-1
.
addition,
[email protected]
as
overall
water
electrocatalyst
can
stably
achieve
large
density
200
over
300
h
at
cell
voltage
1.83
V,
meeting
requirement
industrial
hydrogen
production.
This
exceedingly
simple
ultrafast
synthesis
low-cost
electrocatalysts
propel
commercialization
producing
via
splitting.
ACS Nano,
Journal Year:
2023,
Volume and Issue:
17(2), P. 1485 - 1494
Published: Jan. 11, 2023
Cost-effective
electrochemical
water
splitting
technology
hinges
on
the
development
of
efficient
and
durable
catalysts
for
oxygen
evolution
reaction
(OER).
Spinel
oxides
(formula:
AxB3–xO4)
are
structurally
stable
real
applications.
Much
effort
has
been
devoted
to
improving
catalytic
activity.
Here,
we
report
a
eutectic
dealloying
strategy
activate
porous
spinel
NiFe2O4
nanowires
with
up
four
metal
cation
substitutions.
As-obtained
NiFeXO4
(X
=
Fe,
Ni,
Al,
Mo,
Co,
Cr)
delivers
benchmark
current
density
10
mA·cm–2
at
an
overpotential
only
195
mV,
outperforming
most
phase
OER
electrocatalysts
comparable
state-of-the-art
NiFe
hydroxides.
It
is
over
115
h
electrolysis.
Aberration-corrected
transmission
electron
microscopy,
high-resolution
energy
loss
spectroscopy,
atomic-scale
strain
mappings
reveal
that
multivalent
substitutions
result
in
substantial
lattice
distortion
significant
electronic
coupling
3d
O
2p
orbitals
increased
covalency.
Further
theoretical
calculations
suggest
stabilized
by
high
configurational
entropy,
their
synergy
favors
absorption
H2O
molecules
lowers
adsorption
barrier
OOH*
intermediate.
The
improved
intrinsic
activity
together
highly
nanoporous
structures
contribute
appealing
apparent
performances.
work
demonstrates
effective
approach
synthesis
multicomponent
highlights
effectiveness
multication
substitution
producing
active
catalysts,
which
meet
multiplexed
structure
superior
property
requirements
practical
Journal of Taibah University for Science,
Journal Year:
2023,
Volume and Issue:
17(1)
Published: Feb. 20, 2023
Excessive
use
of
fossil
fuels
has
caused
their
rapid
depletion,
resulting
in
a
growing
energy
crisis
as
well
many
environmental
concerns,
and
prompting
the
development
sustainable
conversion
system.
In
this
study,
we
report
GO
based
SnSe
nanomaterial
incorporated
via
hydrothermal
route
engaging
OER
activity.
The
morphological,
structural
textual
effects
material
have
been
measured
with
scanning
electron
microscopy
(SEM),
X-ray
diffraction
(XRD)
Brunauer
Emmett
Teller
(BET).
Furthermore,
kinetic
process,
active
sites,
conductivity
stability
electrode
medium
GO,
GO/SnSe
were
estimated
electrochemical
impedance
spectroscopy
(EIS),
linear
sweep
voltammetry
(LSV),
surface
area
(ECSA)
chronoamperometry
under
1.0
M
KOH
Ni
foam
conductive
substrate.
Its
results
depicted
following:
nanocomposite
displayed
lesser
overpotential
around
336
mV
to
reach
current
density
10
mA
cm−2
Tafel
slope
36
dec−1.
Cyclic
analysis
show
over
35
h.
exceptional
properties
differentiate
it
good
for
electrical
other
fields
future.
Materials Horizons,
Journal Year:
2023,
Volume and Issue:
10(11), P. 5277 - 5287
Published: Jan. 1, 2023
The
hydrazine
oxidation
reaction
(HzOR)
is
considered
as
a
promising
alternative
process
of
the
oxygen
evolution
(OER)
to
realize
more
energy-efficient
hydrogen
generation.
However,
lack
highly
active
bifunctional
catalysts
poses
huge
challenge
this
strategy.
In
work,
we
report
novel
and
universal
electrodeposition
strategy
rationally
synthesize
self-supporting
electrode.
utilization
ammonium
fluoride
helps
modulate
not
only
morphology
CoP,
but
also
synchronous
formation
an
anion-modified
structure,
leading
excellent
performance.
optimal
F-CoP/CF
exhibits
small
potentials
-90
mV
41
at
1
A
cm-2,
high
stability
low
Tafel
slopes
28
dec-1
3.26
for
HER
HzOR,
respectively.
efficient
stable
activity
can
be
further
confirmed
in
anion-exchange
membrane
hydrazine-assisted
water
electrolyzer
(0.49
V
cm-2).
Utilizing
density
functional
theory
calculations,
optimized
adsorption
energy
molecules
intermediates
well
rate-determining
step
HzOR
are
demonstrated
F-CoP.
Advanced Science,
Journal Year:
2023,
Volume and Issue:
10(16)
Published: April 7, 2023
Nickel-iron
based
hydr(oxy)oxides
have
been
well
recognized
as
one
of
the
best
oxygen-evolving
catalysts
in
alkaline
water
electrolysis.
A
crucial
problem,
however,
is
that
iron
leakage
during
prolonged
operation
would
lead
to
oxygen
evolution
reaction
(OER)
deactivation
over
time,
especially
under
large
current
densities.
Here,
NiFe-based
Prussian
blue
analogue
(PBA)
designed
a
structure-flexible
precursor
for
navigating
an
electrochemical
self-reconstruction
(ECSR)
with
Fe
cation
compensation
fabricate
highly
active
hydr(oxy)oxide
(NiFeO
Small,
Journal Year:
2023,
Volume and Issue:
19(49)
Published: Aug. 7, 2023
Abstract
The
precatalyst
undergoes
surface
reconstruction
during
the
oxygen
evolution
reaction
(OER)
process,
and
reconstituted
material
is
one
that
really
plays
a
catalytic
role.
However,
degree
of
seriously
affects
performance.
For
this
reason,
it
important
to
establish
link
between
activity
based
on
deep
understanding
OER
mechanism
for
rational
design
high‐performance
electrocatalysts.
Here,
briefly
introduced,
competition
adsorbate
(AEM)
lattice
oxygen‐mediated
(LOM)
discussed,
several
descriptors
are
summarized.
strategies
realize
controllable
emphatically
including
ion
leaching,
element
doping,
regulating
catalyst
size,
heterogeneous
structure
engineering,
self‐reconstruction.
A
mechanistic
perspective
emphasized
understand
relationship
dynamic
electronic
structure.
Controlled
reconfiguration
can
break
limitation
proportional
brought
by
traditional
AEM
mechanism,
also
switching
LOM
thus
realizing
ultra‐low
overpotential.
This
review
will
provide
some
reference
transition
metal‐based
catalysts
reasonable
development
ideal
Carbon Neutralization,
Journal Year:
2024,
Volume and Issue:
3(2), P. 172 - 198
Published: Feb. 26, 2024
Abstract
Water
splitting
is
a
critical
process
for
the
production
of
green
hydrogen,
contributing
to
advancement
circular
economy.
However,
application
water
devices
on
large
scale
primarily
impeded
by
sluggish
oxygen
evolution
reaction
(OER)
at
anode.
Thus,
developing
and
designing
efficient
OER
catalysts
significant
target.
NiFe‐based
are
extensively
researched
as
excellent
electrocatalysts
due
their
affordability,
abundant
reserves,
intrinsic
activities.
they
still
suffer
from
long‐term
stability
challenges.
To
date,
few
systematic
strategies
improving
durability
have
been
reported.
In
this
review,
various
advanced
introduced.
Moreover,
challenges
in
alkaline
media,
including
iron
segregation,
structural
degradation,
peeling
substrate
summarized.
More
importantly,
enhance
highlighted
opportunities
discussed
facilitate
future
studies
electrolysis.
This
review
presents
design
strategy
anion
exchange
membrane
(AEM)
electrolyzers
overcome
OER,
which
also
emphasizes
importance
media
its
significance
achieving
large‐scale
commercialization.
