Small,
Journal Year:
2023,
Volume and Issue:
19(32)
Published: April 17, 2023
Two
essential
characteristics
that
are
required
for
hybrid
electrocatalysts
to
exhibit
higher
oxygen
and
hydrogen
evolution
reaction
(OER
HER,
respectively)
activity
a
favorable
electronic
configuration
sufficient
density
of
active
sites
at
the
interface
between
two
materials
within
hybrid.
In
present
study,
electrocatalyst
is
introduced
with
novel
architecture
consisting
coral-like
iron
nitride
(Fe2
N)
arrays
tungsten
(W2
N3
)
nanosheets
satisfies
these
requirements.
The
resulting
W2
/Fe2
N
catalyst
achieves
high
OER
(268.5
mV
50
mA
cm-2
HER
(85.2
10
excellent
long-term
durability
in
an
alkaline
medium.
addition,
functional
theory
calculations
reveal
individual
band
centers
experience
upshift
structure,
thus
improving
activity.
strategy
adopted
here
provides
valuable
guide
fabrication
cost-effective
multi-metallic
crystalline
hybrids
use
as
multifunctional
electrocatalysts.
Energy & Environmental Science,
Journal Year:
2022,
Volume and Issue:
16(3), P. 1035 - 1048
Published: Dec. 21, 2022
A
Pt
1
/(Co,Ni)(OH)
2
/C
single-atom
electro-catalyst
efficiently
splits
water
for
H
generation,
via
balanced
water-dissociation
and
-formation
steps
from
the
synergistic
effect
of
surface-defective
(Co,Ni)(OH)
electronically
tuned
sites.
Small Methods,
Journal Year:
2022,
Volume and Issue:
6(11)
Published: Oct. 17, 2022
Abstract
Development
of
cost‐effective
water
splitting
technology
that
allows
low‐overpotential
operation
at
high
current
density
with
non‐precious
catalysts
is
the
key
for
large‐scale
hydrogen
production.
Herein,
it
demonstrated
versatile
perovskite‐based
oxides,
usually
applied
operating
low
and
room
temperature
in
alkaline
solution,
can
be
developed
into
low‐cost,
highly
active
durable
electrocatalysts
densities
a
zero‐gap
anion
exchange
membrane
electrolyzer
cell
(AEMEC).
The
composite
perovskite
mixed
phases
Ruddlesden–Popper
single
as
anode
AEMEC
exhibits
promising
performance
an
overall
water‐splitting
2.01
A
cm
−2
voltage
only
2.00
V
60
°C
stable
performance.
elevated
to
promote
diffusion
boosts
oxygen
evolution
kinetics
by
enhancing
lattice‐oxygen
participation.
bifunctionality
perovskites
further
promises
more
symmetrical
configuration,
primary
both
electrodes
delivers
3.00
2.42
V.
This
work
greatly
expands
use
robust
industrial
great
practical
application
merit.
Small Methods,
Journal Year:
2023,
Volume and Issue:
7(4)
Published: Feb. 19, 2023
Transition
metal
layered
double
hydroxides,
especially
nickel-iron
hydroxide
(NiFe-LDH)
shows
significant
advancement
as
efficient
oxygen
evolution
reaction
(OER)
electrocatalyst
but
also
plays
a
momentous
role
precursor
for
NiFe-based
hydrogen
(HER)
catalysts.
Herein,
simple
strategy
developing
Ni-Fe-derivative
electrocatalysts
via
phase
of
NiFe-LDH
under
controllable
annealing
temperatures
in
an
argon
atmosphere
is
reported.
The
optimized
catalyst
annealed
at
340
o
C
(denoted
NiO/FeNi3
)
exhibits
superior
HER
properties
with
ultralow
overpotential
16
mV@10
mA
cm-2
.
Density
functional
theory
simulation
and
situ
Raman
analyses
reveal
that
the
excellent
can
be
attributed
to
strong
electronic
interaction
interface
metallic
FeNi3
semiconducting
NiO,
which
optimizes
H2
O
H
adsorption
energies
OER
catalytic
processes.
This
work
will
provide
rational
insights
into
subsequent
development
related
other
corresponding
compounds
LDH-based
precursors.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
34(8)
Published: Nov. 10, 2023
Abstract
Realizing
efficient
electrocatalysts
is
a
stepping
stone
toward
achieving
high‐performance
alkaline
water/seawater
electrolysis,
but
remains
crucial
challenge.
Herein,
heterogeneous
Mo
2
N/Ni
3
N
on
nickel
foam
(denoted
MN‐NMN/NF)
that
stable
and
active
for
the
hydrogen
evolution
reaction
(HER)
in
both
are
demonstrated.
The
optimized
MN‐NMN09/NF
achieves
an
ultralow
HER
overpotential
of
11
mV@10
mA
cm
−2
1.0
m
KOH
electrolyte,
which
not
only
superior
to
benchmark
Pt/C
catalysts
also
best
reported
ever
among
NiMo‐based
environment.
Successively,
electrocatalyst
can
drive
current
densities
10
500
using
low
overpotentials
9.37
123
mV
seawater
durable
after
120
h
long‐term
electrolysis
at
constant
density
.
In
situ
Raman
analysis
reveals
enhanced
performance
attributed
accelerated
H
O
adsorption
OH
dissociation
processes
MN‐NMN
surfaces.
Theoretical
further
confirms
rapid
adsorption‐dissociation
kinetics
adsorption‐conversion
Ni
N/NiOOH
N/MoO
x
surfaces
result
boosted
capability.
This
work
depicts
significant
potential
designing
production
water
electrolysis.
