Abstract
The
development
of
efficient
and
economical
electrocatalysts
for
oxygen
evolution
reaction
(OER)
is
paramount
importance
the
sustainable
production
renewable
fuels
energy
storage
systems;
however,
sluggish
OER
kinetics
involving
multistep
four
proton‐coupled
electron
transfer
hampers
progress
in
these
systems.
Fortunately,
surface
reconstruction
offers
promising
potential
to
improve
catalyst
design.
Anion
modulation
plays
a
crucial
role
controlling
extent
positively
persuading
reconstructed
species'
performances.
This
review
starts
by
providing
general
explanation
how
various
types
anions
can
trigger
dynamic
create
different
combinations
with
pre‐catalysts.
Next,
influences
anion
on
manipulating
process
are
discussed
based
situ
advanced
characterization
techniques.
Furthermore,
effects
survived
anionic
groups
species
water
oxidation
activity
further
discussed.
Finally,
challenges
prospects
future
directions
redirecting
construct
highly
practical
catalysts
proposed.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Апрель 5, 2024
Abstract
Seawater
electroreduction
is
attractive
for
future
H
2
production
and
intermittent
energy
storage,
which
has
been
hindered
by
aggressive
Mg
2+
/Ca
precipitation
at
cathodes
consequent
poor
stability.
Here
we
present
a
vital
microscopic
bubble/precipitate
traffic
system
(MBPTS)
constructing
honeycomb-type
3D
robust
anti-precipitation
seawater
reduction
(SR),
massively/uniformly
release
small-sized
bubbles
to
almost
every
corner
of
the
cathode
repel
precipitates
without
break.
Noticeably,
optimal
with
built-in
MBPTS
not
only
enables
state-of-the-art
alkaline
SR
performance
(1000-h
stable
operation
–1
A
cm
−2
)
but
also
highly
specialized
in
catalytically
splitting
natural
into
greatest
ability.
Low
amounts
after
prolonged
tests
under
large
current
densities
reflect
genuine
efficacy
our
MBPTS.
Additionally,
flow-type
electrolyzer
based
on
stably
functions
industrially-relevant
500
mA
150
h
while
unwaveringly
sustaining
near-100%
Faradic
efficiency.
Note
that
estimated
price
(~1.8
US$/kg
H2
even
cheaper
than
US
Department
Energy’s
goal
(2
).
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
63(1)
Опубликована: Ноя. 23, 2023
Seawater
electrolysis
is
an
attractive
way
of
making
H2
in
coastal
areas,
and
NiFe-based
materials
are
among
the
top
options
for
alkaline
seawater
oxidation
(ASO).
However,
ample
Cl-
can
severely
corrode
catalytic
sites
lead
to
limited
lifespans.
Herein,
we
report
that
situ
carbon
oxyanion
self-transformation
(COST)
from
oxalate
carbonate
on
a
monolithic
NiFe
micropillar
electrode
allows
safeguard
high-valence
metal
reaction
ASO.
In
situ/ex
studies
show
spontaneous,
timely,
appropriate
COST
safeguards
active
against
attack
during
ASO
even
at
ampere-level
current
density
(j).
Our
catalyst
shows
efficient
stable
performance,
which
requires
overpotential
as
low
349
mV
attain
j
1
A
cm-2
.
Moreover,
with
protective
surface
CO32-
exhibits
slight
activity
degradation
after
600
h
under
seawater.
This
work
reports
effective
design
concepts
level
self-transformation,
acting
momentous
step
toward
defending
seawater-to-H2
conversion
systems.
iScience,
Год журнала:
2023,
Номер
27(1), С. 108736 - 108736
Опубликована: Дек. 15, 2023
Herein,
a
hierarchical
NiTe@NiFe-LDH
core-shell
array
on
Ni
foam
(NiTe@NiFe-LDH/NF)
demonstrates
its
effectiveness
for
oxygen
evolution
reaction
(OER)
in
alkaline
seawater
electrolyte.
This
NiTe@NiFe-LDH/NF
showcases
remarkably
low
overpotentials
of
277
mV
and
359
achieving
current
densities
100
500
mA
cm
Advanced Functional Materials,
Год журнала:
2023,
Номер
34(6)
Опубликована: Окт. 22, 2023
Abstract
Defect‐engineering
is
a
viable
strategy
to
improve
the
activity
of
nanocatalysts
for
oxygen
evolution
reaction
(OER),
whose
slow
kinetics
still
strongly
limits
broad
market
penetration
electrochemical
water
splitting
as
sustainable
technology
large‐scale
hydrogen
production.
High‐entropy
spinel
oxides
(HESOs)
are
in
focus
due
their
great
potential
low‐cost
OER
electrocatalysts.
In
this
work,
electrospun
HESO
nanofibers
(NFs),
based
on
(Cr,Mn,Fe,Co,Ni),
(Cr,Mn,Fe,Co,Zn)
and
(Cr,Mn,Fe,Ni,Zn)
combinations,
with
granular
architecture
oxygen‐deficient
surface
produced
by
calcination
at
low
temperature
(600
or
500
°C),
characterized
combination
benchtop
analytical
techniques
evaluated
electrocatalysts
alkaline
medium.
The
variation
composition
produces
complex
interdependent
changes
morphology
fibers,
crystallinity
inversion
degree
oxide,
concentration
oxygen‐vacancies,
cation
distribution
lattice,
which
mirror
different
properties
fibers.
best
electrocatalytic
performance
(overpotential
Tafel
slope
10
mA
cm
−2
:
360
mV
41
dec
−1
,
respectively)
pertains
(Cr
1/5
Mn
Fe
Co
Ni
)
3
O
4
NFs
calcined
°C
results
from
lower
outer
3d‐electron
number,
e
g
filling
closer
its
optimal
value
higher
occupation
16
d
sites
most
redox‐active
species.
