Advanced Sustainable Systems,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 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.
Abstract
Water
splitting,
an
efficient
technology
to
produce
purified
hydrogen,
normally
requires
high
cell
voltage
(>1.5
V),
which
restricts
the
application
of
single
atoms
electrocatalyst
in
water
oxidation
due
inferior
stability,
especially
acidic
environment.
Substitution
anodic
oxygen
evolution
reaction
(OER)
with
hydrazine
(HzOR)
effectually
reduces
overall
voltage.
In
this
work,
utilization
iridium
atom
(Ir‐SA/NC)
as
robust
hydrogen
(HER)
and
HzOR
0.5
m
H
2
SO
4
electrolyte
is
reported.
Mass
activity
Ir‐SA/NC
37.02
A
mg
Ir
−1
at
overpotential
50
mV
HER
catalysis,
boosted
by
127‐time
than
Pt/C.
Besides,
only
0.39
V
versus
RHE
attain
10
mA
cm
−2
dramatically
lower
OER
(1.5
RHE);
importantly,
a
superior
stability
achieved
HzOR.
Moreover,
mass
enhanced
83‐fold
The
situ
Raman
spectroscopy
investigation
suggests
pathway
follows
*N
→*2NH
→*2NH→2N→*N
→N
for
Ir‐SA/NC.
assisted
splitting
demands
drive,
1.25
splitting.
Materials Chemistry Frontiers,
Год журнала:
2023,
Номер
7(20), С. 4833 - 4864
Опубликована: Янв. 1, 2023
This
review
provides
a
comprehensive
of
recent
advances
in
the
design
OER
catalysts.
Specifically,
it
focuses
on
kinetics
and
stability
catalysts,
catalytic
mechanism
innovative
strategies.
ACS Applied Energy Materials,
Год журнала:
2023,
Номер
6(17), С. 8818 - 8829
Опубликована: Авг. 29, 2023
In
order
to
fulfill
the
increasing
energy
demand
of
world,
water
electrolysis
comes
out
be
an
effective
method
for
producing
clean
H2
fuel.
To
catalyze
both
oxygen
evolution
reaction
(OER)
and
hydrogen
(HER)
in
splitting,
inexpensive
bifunctional
catalyst
is
highly
required.
serve
this
purpose,
3d
transition
metal-based
layer
double
hydroxides
(LDH)
proved
catalyst.
Here,
work,
we
have
synthesized
Sm-doped
NiCu-LDH
via
a
single-step
hydrothermal
method.
The
doping
rare-earth
Sm
ions
effectively
modifies
electronic
structure
by
enhancing
activity
active
metal
sites.
OER
HER,
10%
Sm@NiCu-LDH
demands
only
347
192
mV
overpotential
reach
50
mA
cm–2
current
density
along
with
Tafel
slope
values
70
109
dec–1,
respectively.
After
doping,
turnover
frequency
(TOF)
value
has
been
raised
more
than
twofold
compared
bare
NiCu-LDH.
For
total
splitting
(TWS),
when
was
used
as
anode
cathode,
it
1.629
V
cell
voltage
10
density.
Also,
shows
excellent
long-term
stability
robust
nature
48
h
alkaline
conditions.
results
improved
catalytic
activity.
Therefore,
work
paves
road
toward
searching
stable
electrocatalysts
means
providing
good
application.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(5), С. 5965 - 5976
Опубликована: Янв. 24, 2024
The
development
of
low-cost,
efficient
catalysts
for
electrocatalytic
water
splitting
to
generate
green
hydrogen
is
a
hot
topic
among
researchers.
Herein,
we
have
developed
highly
heterostructure
CoCr-LDH
on
NiO
nickel
foam
(NF)
the
first
time.
preparation
strategy
follows
simple
annealing
cleaned
NF
without
using
any
Ni
salt
precursor,
followed
by
growth
nanosheets
over
surface-oxidized
NF.
CoCr-LDH/NiO/NF
catalyst
shows
excellent
activity
and
stability
toward
oxygen
evolution
reaction
(OER)
(HER)
in
1
M
KOH
solution.
For
OER,
only
253
mV
HER,
185
overpotentials
are
required
attain
50
mA
cm
Abstract
The
exploiting
electrocatalysts
for
water/seawater
electrolysis
with
remarkable
activity
and
outstanding
durability
at
industrial
grade
current
density
remains
a
huge
challenge.
Herein,
CoMoN
x
Fe‐doped
nanosheet
arrays
are
in‐situ
grown
on
Ni
foam,
which
possess
plentiful
holes,
multilevel
heterostructure,
lavish
Co
5.47
N/MoN@NF
Fe‐Co
interfaces.
They
require
low
overpotentials
of
213
296
mV
hydrogen
evolution
reaction
(HER)
oxygen
(OER)
under
alkaline
media
to
achieve
800
mA
cm
−2
,
respectively,
both
Tafel
slopes
(51.1
49.1
dec
−1
)
undiminished
stability
over
80
h.
Moreover,
the
coupled
electrolyzer
requires
voltages
1.735
V
yield
500
in
water.
Notably,
they
also
exhibit
exceptional
electrocatalytic
properties
seawater
(1.833
V@500
).
experimental
studies
theoretical
calculations
verify
that
Fe
doping
does
reduce
energy
barrier
from
OH*
O*
intermediates
during
OER
process
after
catalyst
reconstruction,
non‐metallic
N
site
MoN
exhibits
lowest
overpotential.
splendid
catalytic
performance
is
attributed
optimized
local
electron
configuration
porous
structure.
This
discovery
provides
new
design
method
toward
low‐cost
excellent
catalysts
splitting
produce
hydrogen.
