Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 19, 2024
Abstract
The
temperature‐resolved
structure
evolution
of
quinary
and
quaternary
equimolar
oxides
containing
Mg,
Ni,
Zn,
Co,
Cu
is
investigated
by
in
situ
synchrotron
diffraction.
Important
structural
modifications
occur
already
at
mild
temperatures
depend
on
the
elements
involved.
All
compounds
with
χ(Cu)
=
0.25
within
250–500
°C
show
a
tetragonal
phase.
fraction
dictates
degree
distortion:
for
0.20
only
local
distortions
are
observed,
which
do
not
absence
Cu.
Further
heating
restores
original
cubic
phase,
followed
segregation
other
phases,
available.
In
presence
both
guggenite
phase
cation
connectivity
similar
to
high
entropy
oxide,
but
suitable
coordination
environment
atoms
allowing
strong
elongation
octahedra.
Guggenite
acts
as
buffer
layer
facilitating
gradual
diffusion
2+
from
oxide
tenorite.
To
conclude,
it
demonstrated
first
time
that
demixing
prototypal
does
involve
just
tenorite
or
binary
oxides,
rather
mediated
formation
guggenite.
Nanomaterials,
Journal Year:
2025,
Volume and Issue:
15(8), P. 571 - 571
Published: April 8, 2025
High-entropy
oxides
are
a
new
type
of
material
that
consists
five
or
more
principal
elements
in
an
equimolar
nearly
ratio.
They
have
many
excellent
properties
and
rapidly
becoming
hotspot
for
the
development
high-performance
materials.
In
this
study,
electrical
explosion
is
used
first
time
to
synthesize
high-entropy
oxide
nanopowders
with
different
crystal
structures.
(FeCoNiCrCu)O
rock
salt
structure,
(FeCoNiCrTi)O
spinel
(CoNiTiCuZn)O
contains
two
phases.
According
TEM
EDS
results,
distribution
metal
products
comparatively
homogeneous,
particle
size
concentrated
20-40
nm.
Elements
such
as
Ti
prone
formation
element
Cu
structure.
The
study
shows
wires
method
synthesis
nanopowders.
ChemCatChem,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 31, 2024
Abstract
Manganese
oxide
is
a
unique
type
of
transition
metal
that
effectively
functions
as
catalyst
for
the
oxygen
evolution
reaction
(OER).
Here,
manganese
(MnO
x
)
polymorphs
are
synthesized
through
electrochemical
deposition
and
treated
with
an
atmospheric
pressure
plasma
jet
(APPJ).
The
APPJ
surface
treatment
can
generate
numerous
vacancies
modify
crystallinity
MnO
films,
which
enhance
long‐term
stability
films
by
stabilizing
Mn
3+
content
in
highly
oxidizing
environment.
increase
concentration
material
synergistically
adsorption
capacity
OH
*
electron‐transferring
OER
process,
making
them
more
stable
effective
OER.
exhibit
significantly
higher
activity,
better
stability,
lower
Tafel
slopes
than
untreated
films.
remain
up
to
92
hours
during
current
density
10
mA
cm
−2
,
onset
overpotential
310
mV.
This
strategy,
combines
techniques
electrodeposition
methods,
innovative
modification
oxides
mixed
valences
create
catalysts
content.
