Abstract
Anionic
redox
chemistry
has
attracted
increasing
attention
for
the
improvement
in
reversible
capacity
and
energy
density
of
cathode
materials
Li/Na‐ion
batteries.
However,
adverse
electrochemical
behaviors,
such
as
voltage
hysteresis
sluggish
kinetics
resulting
from
weak
metal‐ligand
interactions,
commonly
occur
with
anionic
reactions.
Currently,
mechanistic
investigation
driving
these
issues
still
remains
foggy.
Here,
we
chemically
designed
Na
0.8
Fe
0.4
Ti
0.6
S
2
O
model
cathodes
to
explore
covalency
effects
on
interactions
during
process.
strengthened
covalent
interaction
bonds
exhibits
smaller
faster
than
(de)sodiation
Theoretical
calculations
suggest
that
is
dominant
redox‐active
center
,
whereas
moves
removal
+
.
We
attribute
above
different
behaviors
between
charge
transfer
ligand
metal.
Moreover,
structural
stability
enhanced
by
cation
migration
barriers
through
strong
desodiation.
These
insights
into
originality
provide
guidance
design
high‐capacity
structurally
stable
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Май 14, 2025
Designing
efficient
acidic
oxygen
evolution
catalysts
for
proton
exchange
membrane
water
electrolyzers
is
challenging
due
to
a
trade-off
between
activity
and
stability.
In
this
work,
we
construct
high-density
microcrystalline
grain
boundaries
(GBs)
with
V-dopant
in
RuO2
matrix
(GB-V-RuO2).
Our
theoretical
experimental
results
indicate
highly
active
acid-resistant
OER
catalyst.
Specifically,
the
GB-V-RuO2
requires
low
overpotentials
of
159,
222,
300
mV
reach
10,
100,
1500
mA
cm-2geo
0.5
M
H2SO4,
respectively.
Operando
EIS,
ATR-SEIRAS
FTIR
DEMS
measurements
reveal
importance
GBs
stabilizing
lattice
thus
inhibiting
mediated
pathway.
As
result,
adsorbate
mechanism
pathway
becomes
dominant,
even
at
high
current
densities.
Density
functional
theory
analyses
confirm
that
can
stabilize
V
dopant
synergy
them
modulates
electronic
structure
RuO2,
optimizing
adsorption
intermediate
species
enhancing
electrocatalyst
work
demonstrates
rational
strategy
overcoming
traditional
activity/stability
dilemma,
offering
good
prospects
developing
high-performance
catalysts.
Batteries & Supercaps,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 20, 2024
Abstract
Sodium‐ion
batteries
(SIBs)
are
promising
in
several
aspects
due
to
their
many
advantages
over
lithium‐ion
batteries.
Among
SIB's
outstanding
attributes,
its
low
cost,
resource
abundance,
and
potential
safety
make
it
suitable
for
large‐scale
energy
storage
systems
(ESS).
the
cathode
materials,
poly‐anionic
materials
could
be
a
better
choice
stability
comparison
layered
transition
metal
oxides
Prussian
blue
analogues
(PBA).
However,
on
other
hand,
conductivity
as
well
available
capacity
of
polyanion
compounds
still
poor,
which
limits
applications;
moreover,
some
operate
at
voltage,
reduces
density
raises
cost
battery
system.
We
here
try
summarize
recent
progress
SIB.
These
categorized
based
redox
couple,
including
V‐,
Cr‐,
Mn‐,
Fe‐,
Co‐,
Ni‐polyanion
compounds.
Our
attention
is
specifically
drawn
properties
such
reversible
capacity,
cycling
stability,
sodium
mechanisms.
also
discuss
challenges
development
strategies
future.
Dalton Transactions,
Год журнала:
2024,
Номер
53(42), С. 17370 - 17380
Опубликована: Янв. 1, 2024
The
PPy
coating
enhances
the
structural
stability
and
electronic
conductivity
of
NMO,
accelerates
Na
+
diffusion.
This
study
provides
new
insights
into
design
advanced
cathode
materials
for
SIBs
with
improved
electrochemical
performance.
Abstract
Anionic
redox
chemistry
has
attracted
increasing
attention
for
the
improvement
in
reversible
capacity
and
energy
density
of
cathode
materials
Li/Na‐ion
batteries.
However,
adverse
electrochemical
behaviors,
such
as
voltage
hysteresis
sluggish
kinetics
resulting
from
weak
metal‐ligand
interactions,
commonly
occur
with
anionic
reactions.
Currently,
mechanistic
investigation
driving
these
issues
still
remains
foggy.
Here,
we
chemically
designed
Na
0.8
Fe
0.4
Ti
0.6
S
2
O
model
cathodes
to
explore
covalency
effects
on
interactions
during
process.
strengthened
covalent
interaction
bonds
exhibits
smaller
faster
than
(de)sodiation
Theoretical
calculations
suggest
that
is
dominant
redox‐active
center
,
whereas
moves
removal
+
.
We
attribute
above
different
behaviors
between
charge
transfer
ligand
metal.
Moreover,
structural
stability
enhanced
by
cation
migration
barriers
through
strong
desodiation.
These
insights
into
originality
provide
guidance
design
high‐capacity
structurally
stable
