ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 30, 2025
Laser-structuring
techniques
like
Direct
Laser
Interference
Patterning
show
great
potential
for
optimizing
electrodes
water
electrolysis.
Therefore,
a
systematic
experimental
study
is
performed
to
analyze
the
influence
of
spatial
period
and
aspect
ratio
between
structure
depth
on
electrode
performance
pure
Ni
electrodes.
Using
statistical
design
experiments
approach,
it
found
that
distance
laser-structures
decisive
processing
parameter
improvement
performance.
Thus,
electrochemically
active
surface
area
could
be
increased
by
factor
12
compared
nonstructured
electrode.
For
oxygen
evolution
reaction,
significantly
lower
onset
overpotential
(≈
−164
mV
at
100
mA
cm–2)
found.
This
explained
superhydrophilic
structured
bubble
growth,
which
leads
number
nucleation
sites
and,
simultaneously,
larger
detached
bubbles.
Combined
with
fully
wetted
surface,
this
results
in
reduced
blocking
thus,
ohmic
resistance.
Chemical Reviews,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 11, 2024
Gas
bubbles
generated
by
the
hydrogen
evolution
reaction
and
oxygen
during
water
electrolysis
influence
energy
conversion
efficiency
of
production.
Here,
we
survey
what
is
known
about
interaction
gas
electrode
surfaces
on
practicable
devices
used
for
electrolysis.
We
outline
physical
processes
occurring
life
cycle
a
bubble,
summarize
techniques
to
characterize
phenomena
in
situ
practical
device
environments,
discuss
ways
that
electrodes
can
be
tailored
facilitate
removal
at
high
current
densities.
Lastly,
review
efforts
model
behavior
individual
multiphase
flows
produced
gas-evolving
electrodes.
conclude
our
with
short
summary
outstanding
questions
could
answered
future
electrochemical
environments
or
improved
simulations
flows.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 5, 2025
Abstract
Enhancing
critical
heat
flux
(CHF)
and
transfer
coefficient
(HTC)
by
promoting
the
nucleation,
growth,
departure
of
boiling
bubbles
has
drawn
significant
attention
owing
to
its
wide
applications.
However,
in‐depth
understanding
comprehensive
manipulation
under‐liquid
bubble
dynamics
from
in
situ
microscale
perspectives
remain
challenging.
Herein,
observations
analyses
microsized
ultra‐low
surface
tension
fluorinated
liquids
(FLs)
are
conducted
on
superaerophobic
silicon
surfaces
with
crisscross
microchannels
selective
nanowires.
It
is
revealed
that
deep
yet
short
nanowires
enable
ultrafast
liquid
spreading
(<549.6
ms)
ultralow
adhesion
(≈1.1
µN),
while
an
appropriate
spacing
(240–600
µm)
between
minimizes
time
(<20.6
due
timely
coalescence.
By
verifying
above
principles
through
collaborative
enhancement
CHF
HTC,
optimized
structure
(microchannel
depth
≈52.9
µm,
microchannel
≈362.9
nanowire
length
≈0
nm)
obtained
further
implemented
onto
exposed
Si
a
commercial
CPU
chip.
Cooled
phase‐change
FLs,
average
temperature
maintains
≈64.9
°C
even
under
extreme
power
loads
(≈130
W),
far
below
than
those
conventional
air‐cooling
water‐cooling
operations.
Abstract
Electrocatalytic
water
splitting
for
hydrogen
generation
plays
a
crucial
role
in
promoting
the
energy
transition
and
achieving
goals
of
carbon
neutrality.
Nevertheless,
context
electrolysis,
generated
bubbles
have
an
adverse
impact
on
consumption
mass
transfer
efficiency.
To
address
this
challenge,
variety
strategies
are
investigated
to
accelerate
bubble
detachment
transport.
It
is
utmost
significance
summarize
those
facilitating
advancement
electrolysis
performance.
In
review,
comprehensive
account
presented
enhancing
performance
through
behavior
management.
First,
electrolyte
discussed.
Then,
optimized
interactions
between
electrode
surface
introduced,
which
focus
reducing
adhesion
forces
implementing
other
forces.
Next,
dynamic
bubbling
deformable
catalysts
discussed,
such
as
fern‐
caterpillar‐like
catalysts.
Following
that,
bubble‐bubble
coalescence
proved
be
beneficial
earlier
departure
compared
buoyancy
effect
alone.
Finally,
outlooks
future
development
efficient
removal
enhanced
The
review
aims
deepen
comprehension
stimulate
management
strategies,
thereby
further
electrolysis.
The
rapid
bubble
removal
from
electrodes
diminishes
the
reaction
resistance
within
photoelectrochemical
water
splitting,
and
coalescence
between
bubbles
accelerates
their
detachment.
To
delve
into
size
effects
on
dynamics,
Marangoni
effect
is
utilized
as
a
noninvasively
controlling
means
of
sliding
coalescence.
study
reveals
that
encounter
capillary
waves
induces
A
quantitative
correlation
has
been
established
to
elucidate
relationship
oscillation
time
wave
propagation.
Then,
undergo
damping
oscillations
due
fluid
after
detaching,
characterized
by
same
dimensionless
periods.
Additionally,
detachment
velocity
follows
power
law
1/2
with
ratio
surface
energy
equivalent
radius.
Considering
viscous
dissipation
adhesive
electrode
bubbles,
critical
radius
large
enabling
jumping
deduced
perspective
conservation.
Our
research
provides
strategy
for
management
dynamic
behavior
practical
application
electrolysis
technology.
Industrial & Engineering Chemistry Research,
Год журнала:
2025,
Номер
64(9), С. 5087 - 5098
Опубликована: Фев. 21, 2025
Gas
bubble
adhesion,
a
ubiquitous
phenomenon
in
electrochemical
gas-evolving
reactions,
reduces
the
hydrogen
evolution
reaction
(HER)
activity
water
electrolysis.
Understanding
dynamics
of
gas
detachment
and
its
dependence
on
force
balance
is
crucial
for
manipulating
departure,
but
it
remains
insufficiently
investigated.
Here,
we
found
that
differ
markedly
between
fluidizable
stationary
electrocatalysts,
with
electrocatalysts
minimizing
adhesion
showing
37-fold
increase
HER
rate
constant.
This
enhancement
attributed
to
accelerated
driven
by
fluidization
effect
electrocatalyst
particles.
Specifically,
transition
from
marks
shift
flat
particulate
model,
introducing
promoting
effects
arising
particle
movement
spin-induced
centrifugal
collision-triggered
coalescence.
Consequently,
measured
approaches
intrinsic
value.
work
highlights
as
an
effective
strategy
eliminate
thereby
exposing
nearly
all
active
sites
electrocatalytic
reactions.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 26, 2025
Gas
evolution
plays
an
important
role
in
water
electrolysis,
as
sluggish
bubble
dynamics
lead
to
blockage
of
active
sites,
reduced
catalytic
performance,
and
even
detachment
the
catalysts.
In
this
work,
we
present
a
strategy
fabricate
highly
rough
three-dimensional
(3D)-printed
Ni
(3DPNi)
electrodes
with
ordered
flow
channel
structures,
achieving
exceptional
performance
through
enhanced
transport
dynamics.
The
surfaces
enhance
hydrophilic
aerophobic
properties,
suppressing
coalescence
accelerating
structures
3DPNi
serve
efficient
channels
effectively
prevent
trapping,
facilitating
rapid
Collectively,
these
features
optimize
dynamics,
significantly
boosting
for
electrolysis.
Computational
fluid
simulations
visual
experiments
validate
improved
When
coated
NiFe-LDH
(NiFe-LDH/3DPNi),
low
overpotential
238
mV
is
required
deliver
100
mA
cm-2
OER.
overall
splitting,
NiFe-LDH/3DPNi
||
Pt
plate
setup
requires
cell
voltage
1.86
V
achieve
1
A
demonstrates
excellent
stability
over
h
at
current
density,
indicating
strong
potential
practical
applications.
While
the
dynamics
of
hydrogen
bubbles
during
water
electrolysis
have
been
intensively
studied
in
recent
years,
adequate
insights
into
oxygen
are
still
lacking.
Therefore,
this
study
presents
a
comparative
analysis
and
bubble
potentiostatic
an
acidic
electrolyte.
Complementary
optical
techniques,
such
as
high-speed
shadowgraphy,
particle
tracking
velocimetry,
schlieren
imaging
applied
to
measure
geometric
features
evolving
microscale
Marangoni
convection,
well
refractive
index
field
around
growing
bubbles.
Distinct
differences
between
found
average
current,
convection
pattern,
degree
reduction
at
foot,
suggesting
synergetic
action
both
thermal
solutal
effects
Published
by
American
Physical
Society
2025
