Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 9, 2025
Abstract
This
study
explores
the
effect
of
nickel
cobalt
oxide
(Ni‐Co‐O)
anode
layer
microstructure
on
oxygen
evolution
reaction
(OER).
Four
anodes
with
similar
Ni‐Co‐O
loadings
and
chemical
characteristics
but
distinct
morphologies
are
fabricated
by
ultrasonic
spraying
catalyst
inks
varying
solvent
composition
(pure
water
versus
a
water‐ethanol
mixture)
drying
temperatures
(50
150
°C)
(Ni)
plates.
Upon
composition,
particles
in
water‐based
ink
exhibited
lower
stability
than
water‐ethanol‐based
ink,
boosting
particle
connectivity
layers.
correlated
mechanical
strength
layers,
resulting
reduced
contact
resistance
enhanced
activity.
The
second
observation
is
that
at
50
°C,
surface
morphology
hill‐like
islands
higher
roughness,
while
concave
hemispherical
shapes
roughness
observed.
From
2D‐distribution
data,
it
found
wettability
electrolyte.
Roughness
increased
lyophobicity
activity
through
more
accessible
active
sites
efficient
bubble
transport.
work
highlights
how
affects
macroscopic
properties,
these
turn
can
enhance
or
diminish
performance
OER
compared
to
bare
Ni,
offering
insights
into
knowledge‐based
design
The
performance
of
water
electrolysis
is
profoundly
influenced
by
the
behavior
gas
bubbles
generated
at
electrode
surface.
In
order
to
improve
efficiency
bubble
transportation,
various
nanostructures
for
catalyst
layer
(CL),
such
as
nanorods
(NRs)
or
nanoparticles
(NPs),
have
been
proposed.
However,
there
still
a
lack
complete
understanding
about
relationship
between
morphology
and
evolution,
which
has
considerable
impact
on
transport.
This
study
examines
effect
growth
detachment
in
employing
Lattice
Boltzmann
(LB)
model.
three
different
morphologies,
namely,
nanorods,
nanoparticles,
hierarchical
nanostructures,
dynamics
estimated.
results
suggest
that
characterized
two
factors:
contact
area
electrochemically
active
surface
area,
varies
diameter,
time,
and,
subsequently,
coverage.
As
result,
energy
influenced,
aligned
with
experimental
data
show
voltage
differential
148
mV
current
density
0.65
A/cm2.
highlights
significance
improving
structure
boost
systems.
Applied Sciences,
Journal Year:
2025,
Volume and Issue:
15(8), P. 4107 - 4107
Published: April 8, 2025
Green
hydrogen,
produced
via
electrolysis
using
renewable
energy,
is
a
zero-emission
fuel
essential
for
the
global
transition
to
sustainable
energy
systems.
Optimizing
hydrogen
production
requires
detailed
understanding
of
bubble
dynamics
at
cathode,
which
involves
three
key
stages:
nucleation,
growth,
and
detachment.
In
this
study,
growth
was
investigated
in
custom-built
cell
with
microelectrodes,
combining
high-speed
imaging
electrochemical
measurements
potentiostat.
The
results
reveal
distinct
regimes
governed
by
potential-dependent
time
exponent,
captured
through
power
law.
Within
evaluated
range
potentials,
regions
different
departure
behaviors
were
identified:
(i)
low
potentials
(2.0–2.6
V),
bubbles
depart
without
coalescing,
(ii)
transitional
region
(2.6–3.2
coalesce
varying
degrees
before
detachment,
(iii)
high
(≥3.2
large,
coalesced
dominate.
These
findings
highlight
significant
impact
coalescence
on
behavior,
affecting
electrode
coverage
gas
and,
consequently,
efficiency.
Understanding
these
interactions
crucial
improving
evolution
efficiency
mitigating
bubble-induced
mass
transport
limitations.
contribute
advancing
performance,
offering
insights
into
optimizing
operating
conditions
enhanced
production.
