Chemical Physics Impact,
Journal Year:
2024,
Volume and Issue:
9, P. 100670 - 100670
Published: June 24, 2024
Solid
oxide
electrolysis
cells
(SOECs)
stabilize
CO2
emissions
by
converting
CO2/H2O
into
synfuel.
Current-Voltage
(i-V)
characteristics
of
an
electrolyte-supported
button
cell
(NiO-YSZ/NiO-SDC/ScSZ/LSCF-GDC/LSCF)
were
measured
as
a
function
temperature,
water
vapor
concentration,
and
gas
concentrations.
The
microstructure
was
characterized
the
Field
Emission
Scanning
Electron
Microscope
(FE-SEM).
FE-SEM
micrographs
depict
that
electrolyte
layer
is
relatively
dense,
porous
fuel
air
electrode
layers
are
well
adhered
to
electrolyte.
i-V
curves
obtained
at
scan
rate
0.02
Vs−1
from
0.3
1.5
V.
Electrolysis
current
density
increases
temperature
increases.
SOEC
performance
increases,
but
SOFC
decreases
with
increased
concentration.
densities
decrease
concentration
show
only
ohmic
polarization
under
fuel-lean
fuel-rich
conditions.
At
optimal
conditions,
values
800
°C/1.5
V
-174,
-187,
-195
mA
cm−2
for
5%H2O,
30%CO2,
30%CO2/5%H2O
co-electrolysis.
°C,
open-circuit
voltage
(OCV)
H2O,
CO2,
co-electrolysis
0.906,
0.891,
0.885
V,
respectively.
area-specific
resistances
(ASRs)
give
information
on
reduction
or
forming
CO
H2,
ASR
3.43,
3.29,
3.18
Ω
cm2
co-electrolysis,
Co-electrolysis
has
lower
value
than
pure
H2O
electrolysis,
indicating
involved
in
electrochemical
processes.
