Inorganic Chemistry Frontiers,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
The
heterostructure
catalyst
Fe-Ni
3
S
2
/NiS
exhibits
excellent
activity
and
stability.
doped
Fe
acts
as
a
sacrificial
agent
in
the
oxygen
evolution
reaction
(OER),
maintaining
high
of
Ni,
preventing
Ni–S
bond
degradation.
Advanced Sustainable Systems,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 22, 2025
Abstract
There
is
an
imperative
need
for
highly
efficient
electrocatalysts
cost‐effective
hydrogen
production.
Herein,
a
self‐supported,
hybrid
composite
as
bifunctional
electrocatalyst
introduced.
This
achieved
by
in
situ
growth
of
MoS
2
‐Ni
3
S
on
nickel
foam
(NF),
designated
/NF,
synthesized
facile
one‐step
hydrothermal
synthesis
method.
/NF
exhibits
low
overpotentials
only
187
and
146
mV
OER
HER,
respectively,
to
achieve
current
density
10
mA
cm
−2
1
M
KOH.
The
practical
application
the
designed
verified
constructing
||
symmetrical
membrane
electrode
assembly
(MEA)
4
working
area
anion
exchange
water
electrolyzer.
system
shows
continuous
electrolysis
monitored
48
h
duration.
For
OER,
optimum
d‐band
center
−1.66
eV
heterostructure
calculated
from
Density
Functional
Theory
(DFT)
studies.
factors
like
unique
structure
electrocatalyst,
enhanced
hydrophilicity,
improved
electrochemically
accessible
number
sites
(ECASs),
center,
are
expected
be
primary
contributors
system's
performance.
Thus,
present
finding
unveils
straightforward
approach
creating
stable
advancing
commercial
realm
renewable
electrochemical
energy
conversion.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 2, 2024
Abstract
Aiming
to
efficiently
expedite
alkaline
overall
water
splitting
(OWS)
by
addressing
challenges
such
as
sluggish
kinetics
and
limited
stability,
a
hollow
Fe‐doped
Ni(OH)
2
‐NiS@Ni(OH)
nanorod
array
with
surface
nanosheets
is
devised,
featuring
high‐index
(101)‐NiS(211)
heterostructural
interface
an
upshifted
d
‐band
center.
This
nanoarchitecture
intensifies
the
adsorption
interaction
of
H
O
OH
−
reactants
on
electrocatalyst
surface,
suitably
bonds
*
intermediate
in
hydrogen
evolution
reaction
(HER)
accelerates
electron
movement
H,
minimizes
energy
requirement
rate‐limiting
phase
(
→
O)
oxygen
(OER)
facilitating
O─H
cleavage
optimally
adsorbs
O,
amplifies
exposure
surface‐active
centers,
ultimately
reduces
apparent
activation
energy.
Consequently,
overpotentials
are
low
66.4
mV
254.9
at
10
mA
cm
−2
,
alongside
high
turnover
frequencies
142
s
−1
(H
)
279
(O
100
300
mV,
respectively,
markedly
outperforming
direct‐electrodeposited
analogues.
When
functioning
bifunctional
electrode
OWS,
this
material
merely
requires
1.57
V
sustains
operation
for
168
h,
approaching
Pt/C||RuO
benchmark.
