ACS Applied Energy Materials,
Journal Year:
2024,
Volume and Issue:
7(17), P. 7272 - 7284
Published: Aug. 21, 2024
Polymer
electrolyte
membrane
water
electrolyzers
(PEMWEs)
offer
clean
hydrogen
production
when
coupled
to
renewables,
requiring
minimal
overvoltages
for
efficient
operation.
This
study
adapts
and
improves
upon
a
three-electrode
configuration
utilized
in
fuel
cell
electrolyzer
technologies
comprehensive
operando
thermodynamic
analyses
of
PEMWE
operation
by
accounting
the
impact
catalyst
layer
dimensions
alignment.
Catalyst-coated
Nafion
N117-based
cells
with
precise
were
developed,
design
tolerances
determined
using
finite-element
simulations
verified
microscopic
imaging.
An
external
strip
connected
Ag/AgCl
reference
electrode
acid
solution
enabled
electrochemical
model
platinum
on
Vulcan
carbon
IrO2
catalysts
PEMWEs
artifacts.
analysis
indicated
cathodic
anodic
contributions
voltage.
Under
1
atm
hydrogen,
liquid-fed
conditions,
cathode
exhibited
non-negligible
voltage
attributed
transport
processes,
while
charge
anode
accounted
ca.
15%
series
resistance.
Above
A
cm–2,
became
main
polarization
resistance
low
frequency
inductive
response.
work
provides
critical
insights
into
methods
analyses.
Journal of The Electrochemical Society,
Journal Year:
2024,
Volume and Issue:
171(7), P. 074511 - 074511
Published: July 1, 2024
In
this
work,
≈25
μm
thin
titanium
microporous
layers
(MPLs)
with
≈2
small
pores
and
low
surface
roughness
were
coated
sintered
on
top
of
≈260
thick
commercial
titanium-powder-sinter
sheets
≈16
pores,
maintaining
a
porosity
≈40%
in
both
layers.
Serving
as
porous
transport
(PTLs)
the
anode
side
proton
exchange
membrane
water
electrolyzers
(PEMWEs),
these
pore-graded,
two-layer
(“PTL/MPL”)
are
compared
to
single-layer
PTLs
single-cell
PEMWEs.
The
PTL/MPL
samples
prepared
here
give
3–6
mΩ
cm
2
lower
high-frequency
resistance
(HFR)
as-received
PTL,
which
is
attributed
partial
reduction
TiO
passivation
layer
during
MPL
sintering
process.
For
≈1
anodes
an
iridium
loading
≈0.2
mg
Ir
−2
,
use
leads
≈24
mV
improvement
HFR-free
cell
voltage
at
6
A
.
As
no
such
benefit
observed
for
≈9
≈2.0
mass
resistances
within
play
minor
role.
Possible
reasons
higher
catalyst
utilization
ultra-thin
electrodes
when
using
discussed.
Furthermore,
provides
superior
mechanical
support,
particularly
relevant
membranes.
Frontiers in Energy Research,
Journal Year:
2025,
Volume and Issue:
13
Published: March 14, 2025
Prior
to
moving
newly
developed
catalyst-coated
membranes
(CCMs)
into
large
applications
for
proton
exchange
membrane
water
electrolyzers
(PEMWEs),
a
scaling-up
test
is
essential.
However,
this
usually
experiences
performance
drop
due
the
design
challenges
faced
in
testing
cell
and
assembly
with
active
area.
This
work
investigates
series
of
parameters
assembling
when
scaling
up
CCM
from
5
cm
2
50
,
including
force,
gasket
thickness,
their
combination
different
porous
transport
layers
(PTLs).
At
an
optimal
construction,
area
achieves
current
density
2.4
A/cm
at
1.8
V
tested
cell.
In
comparison,
same
2.2
drops
1.73
.
The
influence
mechanisms
are
then
explored
procedures
further
improvement
PEM
electrolyzers.
Journal of Power Sources,
Journal Year:
2024,
Volume and Issue:
604, P. 234416 - 234416
Published: April 6, 2024
A
mixed
oxide
with
the
crystal
structure
of
DyMn2O5
family,
namely
NdMn1.5Ru0.5O5,
is
reported
active
for
oxygen
evolution
reaction
(OER)
in
acidic
media.
NdMn1.5Ru0.5O5
displays
high
OER
activity
500
gRu−1
at
1.5
V.
Moreover,
more
stable
than
most
Ru
oxides
to
date,
remaining
cycles
between
1.1.
and
1.7
V
low
scan
rate
10
mV
s−1.
The
stability
are
attributed
cations,
as
NdMn2O5
exhibits
very
activity.
has
particularly
short
Ru–Ru
distances
2.60
Å,
a
value
close
metallic
around
2.642
Å.
durability
also
demonstrated
proton
exchange
membrane
water
electrolysis
cell
by
producing
low-loaded
anode
electrode
0.5
mgRucm−2.
achieves
1.97
cm−2,
consistent
performances
Ru-based
catalysts
but
lower
loading.
This
performance
maintained
during
100
h
operation.
Additionally,
visible
ORR
media,
recording
an
onset
potential
0.85
0.1
mA
cm−2.
It
noteworthy
highlight
extreme
rarity
bifunctional
ORR/OER
