ACS Applied Nano Materials,
Journal Year:
2024,
Volume and Issue:
7(14), P. 16599 - 16608
Published: July 9, 2024
Developing
a
host
that
enhances
active
selenium
utilization
and
mitigates
the
polyselenide
shuttle
effect
is
crucial
for
both
sodium–selenium
(Na–Se)
potassium–selenium
(K–Se)
storage
systems.
Herein,
biomass-derived
three-dimensional
nitrogen-doped
cross-linked
porous
carbon
(3D-N-CPC)
designed
as
Se
host.
The
high
specific
surface
area
of
3D-N-CPC
ensures
efficient
Se/Na2Se/K2Se.
abundant
micromesoporous
structures
can
not
only
serve
physical
barriers
storing
small
molecules
confining
polyselenides
but
also
effectively
alleviate
volume
expansion
during
cycling.
In
addition,
in
situ
N-doped
sites
improve
electrical
conductivity
accelerate
conversion
kinetics.
By
combining
these
advantages,
3D-N-CPC/Se
electrode
exhibits
reversible
capacity
393
mA
h
g–1
after
2000
cycles
at
2C
superior
rate
performance
328
10C
Na–Se
batteries.
Moreover,
demonstrates
batteries
across
wide
temperature
range
(−10
to
50
°C).
K–Se
batteries,
maintains
476
200
0.2C.
This
work
could
pave
way
development
conductive
matrix
with
structure
advanced
selenium-based
battery
Small Methods,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 9, 2025
Abstract
Alluaudite‐type
Na
2+2x
Fe
2‐x
(SO
4
)
3
(NFS)
with
high
theoretical
energy
density
is
regarded
as
the
promising
cathode
of
sodium‐ion
batteries
(SIBs),
while
practical
rate
and
cyclic
performances
are
still
hindered
by
intrinsic
poor
conductivity.
Here,
a
facile
method
developed,
collaborating
high‐boiling
organic
solvents
assisted
colloidal
synthesis
(HOS‐CS)
sintering
for
tailoring
2
nanocrystals
decorated
conductive
carbon
network
toward
high‐rate‐capability
SIBs.
Impressively,
as‐prepared
@MC
provides
60.6
46.9
mAh
g
−1
reversible
capacities
even
at
ultrahigh
rates
20
30
C,
respectively,
ranking
superior
state
among
current
NFS‐based
cathode.
More
importantly,
achieves
73%
capacity
retention
C
after
500
cycles,
highlighting
its
potential
application
fast
chargeable
As
bonus,
full‐cell
configuration
constructed
commercial
hard
(HC)
anode
delivers
45.6
10
68.3
initial
≈79.4%
100
cycles
C.
Also,
@MC||HC
full
cell
supplies
140
Wh
kg
density.
This
work
offers
novel
approach
to
prepare
NFS
SIBs
both
fast‐charging
ability.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 26, 2025
Artificial
superstructures
with
advanced
physicochemical
properties
and
electronic
interfaces
are
of
great
importance
for
capacitive
energy
storage.
Herein,
by
one-step
phase
transition
interfacial
bridging,
we
achieve
thermodynamically
stable
synthesis
the
1T-MoS2/graphitic
carbon
nitride
(g-CN)
superstructure,
where
atoms
g-CN
covalently
bridged
on
molybdenum
1T
disulfide
(1T-MoS2)
interface
via
C-Mo
bonds.
The
DFT
MD
calculations
reveal
that
1T-MoS2/g-CN
superstructure
a
strong
interaction
(covalent
character:
97%),
superior
electron
conduction
(d-band
center:
-1.2
eV),
abundant
accessible
channels
(free
volume:
53%
whole
space),
expedited
redox
kinetics
(reaction
barriers:
0.9
eV)
can
enhance
charge
transfer
faradaic
ion
accumulation.
Therefore,
delivers
high
specific
capacitance
2080
F
g-1
excellent
structural
stability
in
KOH
solution.
Moreover,
solid-polymer-electrolyte
chip-based
supercapacitors
large
density
(73
mWh
g-1),
outstanding
cycling
(91%
retention
after
10,000
cycles),
desired
self-powered
application.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 10, 2025
Abstract
Transition
metal
compounds
are
being
extensive
studied
in
K‐ion
hybrids
capacitors
(KIHCs)
owing
to
their
abundant
resource
and
ultrahigh
theoretical
capacity.
However,
poor
cycling
lifespan
rate
capability
as
vulnerable
structures
is
the
major
bottleneck
for
future
development.
Here
design
construction
a
heterostructure
Nickel
sulfoselenide
arrays
(NiSSe)
with
large‐scale
high
ordering
large
interval
spacing
reported.
Benefiting
from
synergistic
effect
of
inner
Cu
nanoarray
superior
conductivity
outer
NiSSe
layer
massive
active
sites,
exhibits
storage
reversible
potassium
ion
(585
mAh
g
−1
at
0.2
A
)
excellent
cycle
stability.
As
expected,
KIHCs
assembled
anode
N/O
co‐doped
carbon
nanowire
array
(NOC)
cathode
deliver
high‐energy
density
power
(156.2
Wh
kg
20
kW
well
lifespan.
The
first‐principle
calculations
reveal
that
have
ionic/electronic
characteristics
low
diffusion
barriers
K
+
‐intercalation.
This
core–shell
strategy
may
open
up
novel
avenue
transition
application
electrochemical
storage,
conversion,
beyond.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 10, 2025
Abstract
A
multiphasic
K
0.147
Na
4.853
V
12
O
32
/NaV
6
15
@C
(KNVO/NVO@C)
heterostructure
is
realized
to
feature
a
lattice‐matched
coherent
interface
with
strong
interfacial
electric
field
in
the
cathodes,
thereby
elevating
d‐band
center
and
strengthening
adsorption
transportation
of
+
enhanced
capacity.
The
heterostructured
KNVO/NVO@C
cathode
exhibits
an
exceptional
rate
capability
(235.2
mAh
g
−1
at
0.2
C
151.7
10
C)
ultralong
cycling
stability
high
capacity
retention
95%
after
1000
cycles
5
C.
It
found
that
synergy
between
structural
properties
stress
generated
by
work
function
difference
heterointerface
upshifts
vanadium
toward
Fermi
level,
which
effectively
lowers
diffusion
barrier,
facilitates
charge
transfer,
accelerates
reaction
kinetics
electron/ion
transport.
calculated
coefficient
reaches
≈10
−11
cm
2
s
,
highly
exceeding
KNVO
electrode.
These
findings
offered
robust
framework
for
rational
engineering
develop
next‐generation
high‐performance
energy
storage
devices.
Carbon Neutralization,
Journal Year:
2025,
Volume and Issue:
4(2)
Published: March 1, 2025
ABSTRACT
Iron‐based
selenides
are
considered
as
potential
electrode
materials
in
potassium‐ion
batteries
(PIBs)
owing
to
the
merits
of
high
capacity,
intrinsic
safety,
and
cost‐effectiveness.
However,
sluggish
electronic/ionic
transport
kinetics
large
volume
variations
result
suboptimal
electrochemical
performance.
Herein,
we
report
a
nickel‐doped
Fe
7
Se
8
with
double‐shell
N‐doped
carbon
(Ni‐Fe
@DNC)
anode
for
robust
potassium
ion
storage.
Notably,
introduction
Ni
induces
lattice
distortion
leads
rearrangement
charge,
thereby
creating
numerous
active
sites
optimizing
band
structure
enhance
charge
transport.
Additionally,
elastic
shell
can
synergistically
mitigate
expansion
upon
cycling
maintain
structural
stability.
Thus,
Ni‐Fe
@DNC
presented
excellent
stability
more
than
1
year
(464.8
mAh
g
−1
after
1000
cycles
at
0.1
A
,
best
among
all
iron‐based
selenides)
satisfactory
rate
capability.
The
hybrid
capacitors
(PIHCs)
have
also
demonstrated
remarkable
energy
density
186.5
Wh
kg
0.2
.
Density
functional
theory
calculations,
conjunction
range
characterization
methods,
validate
rapid
pseudocapacitive
effect
lower
diffusion
barriers,
resulting
from
doping,
improve
reaction
kinetics.
This
study
paves
avenue
novel
material
designs
PIBs.
