The
decoration
of
less
agglomerated
hierarchical
semiconducting
metal
oxides
with
noble
metals
is
a
widely
used
strategy
to
obtain
high-performance
gas
sensors.
Beyond
conventional
approaches,
we
synthesized
amorphous
Pt-decorated
NiFe2O4
nanorods
as
sensing
materials
by
using
temperature-controlled
one-step
impregnation
method.
This
method
characterized
its
simplicity
and
green,
energy-efficient,
economical
use
metals.
show
unusual
resistance
behavior
in
air,
their
operating
temperature–resistance
curve
exhibits
two
transitions.
phenomenon
results
from
the
enhanced
chemisorption
oxygen
molecules
compared
pristine
NiFe2O4,
which
was
proven
temperature-dependent
N2.
synergistic
effects
between
structure
lead
significantly
improved
performance
acetone,
especially
5
wt
%
NiFe2O4.
It
shows
37-fold
increase
response,
lower
optimal
temperature,
selectivity
counterpart.
research
offers
an
efficient
for
designing
metal-decorated,
oxide
provides
insights
into
baseline
onto
surface
materials.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(13), P. 16120 - 16131
Published: March 21, 2024
Owing
to
the
strong
basicity
and
reactivity,
residual
sodium
compounds
(RSCs)
on
surface
of
Na-based
layered
oxides
for
sodium–ion
batteries
(SIBs)
cause
deterioration
electrochemical
performance
processability
oxide
cathode
materials.
Herein,
considering
P2-type
Na0.66Ni0.26Zn0.07Mn0.67O2
as
model
material,
water-washing
treatment
is
proven
be
a
facile,
economic,
highly
efficient
method
improve
Ni/Mn-based
oxides.
Experimental
results
show
that
RSCs
material
surfaces
can
effectively
removed
by
water
washing
without
causing
severe
damage
bulk
structure.
Notably,
triggers
formation
an
ultrathin
(2–3
nm
thick)
Na-poor
disordered
interfacial
layer
Na0.66Ni0.26Zn0.07Mn0.67O2.
This
plays
passivating
role
in
further
enhancing
material's
resistance
reduces
reactivity
with
electrolyte.
These
compositional
structural
optimizations
suppress
release
gaseous
CO2,
thick
cathode–electrolyte
interphase
films,
consumption
active
Na+,
enabling
good
Na+
transport
kinetics
during
cycling.
The
water-washed
exhibits
significantly
improved
cycling
stability
capacity
retention
89.1%
at
100
mA
g–1
after
cycles
rate
capability
discharge
76.3
2000
g–1;
these
values
are
higher
than
those
unwashed
(83.3%,
71.4
h
g–1).
work
provides
fundamental
insights
into
detrimental
effect
highlights
importance
regulating
compositions
developing
high-performance
layered-oxide
materials
SIBs.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(34), P. 45030 - 45037
Published: Aug. 19, 2024
Stabilizing
the
crystalline
structure
and
surface
chemistry
of
Ni-rich
layered
oxides
is
critical
for
enhancing
their
capacity
output
cycle
life
at
a
high
cutoff
voltage.
Herein,
we
adopted
simple
one-step
solid-state
method
by
directly
sintering
Ni0.9Co0.1(OH)2
precursor
with
LiOH
Ta2O5,
to
simultaneously
achieve
bulk
material
synthesis
LiNi0.9Co0.1O2
in
situ
construction
rock-salt
Ta-doped
interphase
an
amorphous
LiTaO3
outer
layer,
forming
chemically
bonded
biphase
coating
on
LiNi0.9Co0.1O2.
Such
cathode
architectural
design
has
been
demonstrated
superior
advantages:
(1)
eliminating
residual
alkali,
(2)
strengthening
oxygen
lattice,
(3)
suppressing
bulk-phase
transformation,
(4)
facilitating
Li-ion
transport.
The
obtained
exhibits
excellent
electrochemical
performance,
including
initial
reversible
180.3
mAh
g–1
1.0
C
85.5%
retention
after
300
cycles
(2.8–4.35
V)
182.5
0.2
87.6%
100
(2.8–4.5
V).
Notably,
this
facile
scalable
electrode
engineering
makes
promising
practical
applications.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 4, 2025
Single-crystalline
LiNi0.9Co0.05Mn0.05O2
(SCNCM90)
cathode
materials
experience
continuous
capacity
degradation
during
cycling,
primarily
due
to
irreversible
structural
transformations
and
oxygen
loss.
These
alterations
are
driven
by
the
local
adjustment
of
in-layer
interlayer
transition
metal
ions
as
a
result
anionic
cationic
redox
reactions.
In
this
study,
selenium
(Se)
titanium
(Ti)
were
simultaneously
incorporated
into
SCNCM90
structure
enhance
stability,
inhibit
reactions
lattice
oxygen,
mitigate
severe
internal
strain
induced
phase
near
end
charge.
Moreover,
Se/Ti
regulation
in
reduces
Li+
migration
barrier,
suppresses
Li/Ni
cation
mixing
further
stabilizes
SCNCM90.
The
formation
O-transition
-Se
bonds
deep
charging
can
reduce
outward
Oα-
(α
<
2)
increase
vacancy
energy,
thereby
improving
stability
processes
within
Ti4+
promotes
nanoscale
mixed-phase
layer
on
surface
SCNCM90,
enhancing
reversibility
H2-H3
transition.
Additionally,
alleviation
enhanced
significantly
contribute
long-term
cyclic
cathodes.
Hence,
modification
material
achieves
retention
87.6%
after
500
cycles
at
1
C
with
2.8-4.5
V,
compared
only
61.4%
for
undoped
cathode.
A
2.83
Ah
pouch
cell
SCNCM90-0.6ST||graphite
electrodes
demonstrates
long
cycle
life
over
cycles,
3.1%
loss
3-4.25
V.
This
work
reveals
that
mitigation
particle
cracking
suppression
release
crucial
improvements
Ni-rich
layered
materials.
High-energy-density
lithium-ion
batteries
have
great
need
for
cathode
materials
with
exceptional
specific
discharge
capacity.
Li3V2O5
shows
potential
because
of
its
high
capacity
(e.g.,
266
mA
h
g-1
at
0.1
A
g-1).
However,
low-lying
voltage
plateau
(∼0.6
V
vs
Li+/Li)
restricts
use
exclusively
to
anode
applications.
This
work
presents
the
first
time
development
as
a
high-energy-density
material
through
Ni
doping.
Structural
analysis
reveals
that
Ni-doped
forms
cation-disordered
rock-salt
phase
uniform
distribution
Ni.
Introducing
1
mol
%
(denoted
LVON2)
prolongs
V-based
(∼2.5
V)
and
results
in
an
additional
35
g-1.
In
particular,
ascribed
Ni2+/Ni3+
redox
reaction
emerges
∼3.5
V,
contributing
extra
42
Consequently,
LVON2
achieves
capacities
270.8
50
339.4
20
(corresponding
energy
density
837
W
kg-1),
surpassing
pristine
many
latest
materials.
Density
functional
theory
calculation
preferentially
occupies
empty
tetragonal
sites
Li3V2O5,
leading
larger
off-center
displacement
neighboring
LiO6
octahedra
expansion
unit
cell
volume.
structural
manipulation
improves
electrochemical
dynamics
better
rate
capability
(143.3
94.1
sample
1000
g-1)
decreased
charge-transfer
resistance
(159.2
Ω
278.6
sample).
Differential
scanning
calorimetry
finite
element
also
reveal
enhanced
thermal
stability
both
full
battery
levels.
advancement
lays
solid
foundation
Li3V2O5-based
batteries.
