Fuels,
Journal Year:
2024,
Volume and Issue:
5(3), P. 564 - 573
Published: Sept. 20, 2024
The
aim
of
this
work
was
to
verify
the
possibility
forming
Ni-Fe
and
Co-Fe
alloys
via
topotactic
ion
exchange
exsolution
in
Fe-infiltrated
(La,Sr,Ce)0.9(Ni,Ti)O3-δ
or
(La,Sr,Ce)0.9(Co,Ti)O3-δ
ceramics.
For
purpose,
samples
were
synthesized
using
Pechini
method
then
infiltrated
with
an
iron
nitrate
solution.
reduction
process
dry
H2
forced
exsolution,
leading
formation
additional
round-shape
structures
on
surfaces
grains.
EDS
scans
XRD
analysis
confirmed
bimetallic
alloys,
which
suggests
that
these
materials
have
great
potential
for
further
use
as
anode
Solid
Oxide
Fuel
Cells
(SOFCs).
Small,
Journal Year:
2024,
Volume and Issue:
20(47)
Published: Aug. 24, 2024
Abstract
Nanoparticle
exsolution
has
emerged
as
a
versatile
method
to
functionalize
oxides
with
robust
metallic
nanoparticles
for
catalytic
and
energy
applications.
By
modifying
certain
external
parameters
during
thermal
reduction
(temperature,
time,
reducing
gas),
some
morphological
and/or
compositional
properties
of
the
exsolved
can
be
tuned.
Here,
it
is
shown
how
application
high
pressure
(<100
bar
H
2
)
enables
control
ternary
FeCoNi
alloyed
from
double
perovskite.
affects
lattice
expansion
nanoparticle
characteristics
(size,
population,
composition).
The
composition
could
controlled,
showing
reversal
expected
thermodynamic
trend
at
10
50
bar,
where
Fe
becomes
main
component
instead
Ni.
In
addition,
drastically
lowers
temperature
300
°C,
resulting
in
unprecedented
highly‐dispersed
small‐sized
similar
those
obtained
600
°C
bar.
mechanisms
behind
effects
on
are
discussed,
involving
kinetic,
surface
thermodynamics,
lattice‐strain
factors.
A
volcano‐like
extent
suggests
that
competing
pressure‐dependent
govern
process.
Pressure
emerges
new
design
tool
enabling
novel
nanocatalysts
surface‐functionalized
materials.
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 9, 2024
Abstract
Double
perovskite
(DP)
oxides
are
promising
electrode
materials
for
symmetric
solid
oxide
cells
(SSOCs)
due
to
their
excellent
electrochemical
activity
and
stability.
B‐site
cation
doping
in
DP
affects
the
reversibility
of
phase
transformation
exsolution,
which
plays
a
crucial
role
catalyst
recovery.
Yet,
few
studies
have
been
conducted
on
this
topic.
In
study,
Sr
2
Fe
1.5‐x
Co
x
Mo
0.5
O
6‐δ
(CSFM,
=
0,
0.1,
0.3,
0.5)
system
demonstrates
modulated
exsolution
by
manipulating
oxygen
vacancy
concentration.
The
correlation
between
Co‐doping
level
concentration
is
investigated
optimize
properties.
1.2
0.3
(3CSFM)
exhibits
reversible
Ruddlesden–Popper
phases
with
high
density
exsolved
CoFe
nanoparticles
under
redox
atmospheres.
quasi‐symmetric
cell
3CSFM
shows
peak
power
1.27
W
cm
−2
at
850
°C
H
fuel
mode
current
2.33
A
1.6
V
800
electrolysis
mode.
robust
stability
during
continuous
operation
≈700
h.
These
results
demonstrate
significant
designing
capable
dynamic
diverse
environments.
Fuels,
Journal Year:
2024,
Volume and Issue:
5(3), P. 564 - 573
Published: Sept. 20, 2024
The
aim
of
this
work
was
to
verify
the
possibility
forming
Ni-Fe
and
Co-Fe
alloys
via
topotactic
ion
exchange
exsolution
in
Fe-infiltrated
(La,Sr,Ce)0.9(Ni,Ti)O3-δ
or
(La,Sr,Ce)0.9(Co,Ti)O3-δ
ceramics.
For
purpose,
samples
were
synthesized
using
Pechini
method
then
infiltrated
with
an
iron
nitrate
solution.
reduction
process
dry
H2
forced
exsolution,
leading
formation
additional
round-shape
structures
on
surfaces
grains.
EDS
scans
XRD
analysis
confirmed
bimetallic
alloys,
which
suggests
that
these
materials
have
great
potential
for
further
use
as
anode
Solid
Oxide
Fuel
Cells
(SOFCs).
