Chemistry - A European Journal,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 11, 2024
Cost-effective
electrocatalysts
is
a
key
constituent
to
establish
the
balance
of
cost
and
catalytic
efficiency
for
oxygen
evolution
reaction
(OER)
via
water
electrolysis
in
area
energy
conversion
storage.
NiFe
phosphide
decorated
with
trace
amount
iridium
(Ir)
species
in-situ
grown
on
carbon
cloth
was
prepared
by
facile
wet
chemistry
approach
followed
phosphorization
post-treatment
at
relative
low
temperature.
The
optimal
electrocatalyst,
Ir
An
indirect,
swift,
and
easy
method
of
enhancing
the
oxygen
evolution
reaction
(OER)
performance
an
economically
viable
Fe-rich
NiFeCo
(NFC)
alloy
has
been
developed.
This
approach
leverages
anodic
potential
sweeps
applied
indirectly
to
counter
electrode
(CE)
when
one
does
cathodic
hydrogen
(HER)
on
by
sweeping
at
working
(WE).
In
this
method,
NFC
was
intentionally
corroded
using
it
as
a
CE
for
HER
experiment
done
with
Pt
WE.
The
(NFC_IC)
featuring
mostly
γ-NiFeOOH
γ-NiCoOOH
entities
surface
able
begin
OER
onset
overpotential
250
mV
reach
benchmark
10
mA
cm-2
290
mV,
which
is
60
55
lesser
than
that
bare
RuO2,
respectively,
all
exceptionally
faster
kinetics,
evidenced
relatively
smaller
Tafel
slope
30
dec-1.
These
insights
into
designing
trimetallic
alloy-based
electrocatalyst
have
opened
previously
unknown
avenue
in
development
advanced
self-supported
electrodes
better
efficient
H2
production
via
water
electrolysis.
Metal
oxyhydroxides
have
been
considered
efficient
electrocatalysts
for
the
oxygen
evolution
reaction
(OER),
and
structural
flexibility
has
a
significant
role
in
boosting
catalytic
performance.
However,
control
usually
requires
time-consuming
complicated
synthesis
stages.
Here,
rapid
one-step
wet-chemical
synthetic
approach
is
reported
to
construct
amorphous
NiFeOOH
nanosheets
(a-NiFex
NSs).
This
short-term,
low-cost
method
can
efficiently
crystallinity
of
materials.
Interestingly,
one
regulate
defect
concentration
metal
valence
by
varying
Ni/Fe
ratio.
The
high-valence
species
vacancy
structure
facilitate
nucleophilic
attack
OH–,
activate
lattice
oxygen,
promote
electrocatalytic
optimized
a-NiFe0.86
NS
exhibits
superior
performance
with
low
overpotential
309
mV
achieve
100
mA
cm–2
high
stability.
strategy
provides
facile
universal
fabricating
NiFe-based
as
highly
OER
electrocatalysts.
