Engineering Applications of Computational Fluid Mechanics,
Journal Year:
2024,
Volume and Issue:
18(1)
Published: May 16, 2024
Bipolar
plates
perform
multiple
functions
for
the
proton
exchange
membrane
fuel
cell
(PEMFC).
This
study
focuses
on
optimizing
cathode
channels
to
leverage
a
local
loss
mechanism
enhance
gas
transfer
and
diffusion
efficiency.
Through
investigation
of
3D
simulations,
this
research
delves
into
effects
curvature
both
reactant
diffusion.
The
results
illustrated
that
compared
with
straight
channels,
performance
improves
as
bending
angle
(θ)
2.5°
5°
at
different
current
densities.
Specifically,
5°,
5.5%
higher
density
than
channel
0°
is
obtained.
suggests
moderate
can
effectively
promote
efficient
mass
transport
diffusion,
ultimately
contributing
enhanced
performance.
Furthermore,
analysis
around
bends
underscores
importance
balance
between
these
factors.
While
angles
within
range
offer
optimal
gains,
excessive
curvature,
such
10°
angle,
may
lead
diminished
By
identifying
elucidating
underlying
mechanisms
driving
improvements,
provides
insights
design
optimization
flow
fields
in
AO-PEMFC.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 4, 2024
Abstract
2D
architectures
and
superior
physiochemical
properties
of
MXene
offer
an
exciting
opportunity
to
develop
a
new
class
polymer
electrolyte
membranes
by
controlling
the
stacking
behavior
nanosheets.
However,
assembling
nanosheets
into
macroscopic
stable
high‐performance
proton
conductors
is
challenging.
Here,
general
strategy
reported
for
achieving
MXene‐based
heterogeneous
via
crosslinked
cellulose
nanofiber/sodium
alginate
(CNF/SA).
Through
coordination
calcium
ions
with
1D
CNF/SA,
abundant
hydrogen‐bonding
networks
are
firmly
locked
network,
meanwhile,
chains
transformed
from
randomly
arranged
state
long‐range
ordered
arrangement,
such
molecular
channels
collaborate
tightly‐stacked
jointly
guide
efficient
conduction.
Thus,
as‐built
CNF/SA/MXene
(CSM)
composite
membrane
exhibits
mechanical
(164.7
MPa),
conductivity
(45.4
mS
cm
−1
),
power
density
(49.5
mW
−2
low
open
circuit
voltage
(OCV)
decay
rate
(0.4
mV
h
).
The
design
principle
material
anchoring
through
ionic‐cross‐linking
mixed‐dimensional
assembly
can
inspire
synthesis
various
ion
exchange
filtration,
transport,
sieving,
more.
Chemical Communications,
Journal Year:
2024,
Volume and Issue:
60(56), P. 7113 - 7123
Published: Jan. 1, 2024
The
progress
of
proton
exchange
membrane
fuel
cells
(PEMFCs)
in
the
clean
energy
sector
is
notable
for
its
efficiency
and
eco-friendliness,
although
challenges
remain
terms
durability,
cost
power
density.
