ACS Applied Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 21, 2024
Interfacial
engineering
is
pivotal
in
optimizing
the
ionic
conductivity
semiconductor–ionic
electrolytes
for
low-temperature
solid
oxide
fuel
cells
(LT-SOFCs).
In
this
study,
we
propose
a
semiconductor
NaxCoO2−δ
and
Sm0.2Ce0.8O2−δ
(SDC)
heterostructure
as
functional
membrane
sandwiched
between
two
symmetric
porous
electrodes
LiNi0.8Co0.15Al0.05O2−δ
(NCAL).
The
A-site
non-stoichiometry
modifies
energy
band
structure
by
altering
Co3+/Co4+
concentration,
thereby
regulating
conduction
properties.
Structural
electrical
characterization
of
material
was
conducted
to
investigate
heterointerfaces,
oxygen
vacancies,
their
influence
on
charge
carrier
transportation.
Electrochemical
impedance
spectroscopy
demonstrated
remarkable
performance
Na0.7CoO2–SDC
(NCO7–SDC),
which
exhibited
an
0.132
S/cm
at
550
°C
under
3%
H2O
humidified
(4%
H2
+
96%
N2)
conditions.
Enhanced
interfacial
transportation
attributed
synergistic
interplay
Li+-rich
space-charge
layers,
alignment,
excess
vacancies
generated
interface
along
with
Schottky
junction
metallic
Ni-electrode
electrolyte.
Our
investigation
further
reveals
that
optimal
concentration
Na
ions
crucial
inducing
appropriate
bending
vacancy
generation
Na0.7CoO2–SDC,
enhance
protonic
conduction.
XPS
analysis
hydrogen-exposed
sample
confirmed
dominant
through
H+
OH–
species.
These
findings
emphasize
potential
NaxCoO2–SDC
high-performance
electrolyte
LT-SOFC,
even
low-concentration
fuel,
paving
way
advancement
cell
technology.
Nano-Micro Letters,
Год журнала:
2024,
Номер
17(1)
Опубликована: Сен. 26, 2024
Abstract
The
development
of
low-temperature
solid
oxide
fuel
cells
(LT-SOFCs)
is
significant
importance
for
realizing
the
widespread
application
SOFCs.
This
has
stimulated
a
substantial
materials
research
effort
in
developing
high
oxide-ion
conductivity
electrolyte
layer
In
this
context,
first
time,
dielectric
material,
CaCu
3
Ti
4
O
12
(CCTO)
designed
LT-SOFCs
study.
Both
individual
CCTO
and
its
heterostructure
with
p
-type
Ni
0.8
Co
0.15
Al
0.05
LiO
2−
δ
(NCAL)
semiconductor
are
evaluated
as
alternative
electrolytes
LT-SOFC
at
450–550
°C.
single
cell
exhibits
power
output
approximately
263
mW
cm
−2
an
open-circuit
voltage
(OCV)
0.95
V
550
°C,
while
CCTO–NCAL
capably
delivers
improved
605
along
higher
OCV
over
1.0
V,
which
indicates
introduction
hole-conducting
NCAL
into
could
enhance
performance
rather
than
inducing
any
potential
short-circuiting
risk.
It
found
that
these
promising
outcomes
due
to
interplay
structure,
overall
properties
led
improve
electrochemical
mechanism
CCTO–NCAL.
Furthermore,
density
functional
theory
calculations
provide
detailed
information
about
electronic
structural
their
Our
study
thus
provides
new
approach
advanced
LT-SOFCs.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(30), С. 40086 - 40099
Опубликована: Июль 18, 2024
In
recent
years,
ceramic
cells
based
on
high
proton
conductivity
have
attracted
much
attention
and
can
be
employed
for
hydrogen
production
electricity
generation,
especially
at
low
temperatures.
Nevertheless,
attaining
a
power
output
durability
is
challenging,
operational
this
regard,
we
design
semiconductor
heterostructure
SFT-ZnO
(SrFe
Advanced Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 27, 2025
Operating
within
the
300-500
°C
range,
low-temperature
solid
oxide
fuel
cells
(LT-SOFCs)
enable
efficient
and
sustainable
energy
conversion,
addressing
limitations
of
conventional
high-temperature
SOFCs.
However,
achieving
>0.1
S
cm-1
ionic
conductivity
in
electrolytes
remains
challenging.
Here,
a
novel
approach
utilizing
CuO
self-nucleation
electron-ion
(E-I)
coupling
xCuO/(1-x)
CeO2
(CCO)
semiconductor
membranes
(x
=
0-0.4)
is
presented.
At
optimal
0.2CuO/0.8CeO2
composition,
exceeds
0.15
cm-1,
driven
by
E-I
at
CuO/CeO2
heterojunction.
This
creates
built-in
electric
field
(BIEF)
via
interfacial
charge
transfer,
facilitating
ion
transport
lowering
activation
for
migration.
The
dual-conduction
pathway
enabled
not
only
facilitates
electronic
transfer
but
also
optimizes
kinetics,
exceptional
power
densities
750-900
mW
cm-2
500-550
78
300
°C.
Density
functional
theory
(DFT)
calculations
further
validate
role
Cu2+
Ce4+
valence
states
generating
enhancing
mobility.
innovative
positions
as
state-of-the-art
electrolyte,
building
critical
conductivity-performance
gap
LT-SOFCs.
study
pioneers
LT-SOFC
innovation
leveraging
electrode-electrolyte
synergy,
unlocking
superior
practical
applicability.
