ACS Applied Energy Materials,
Год журнала:
2024,
Номер
7(14), С. 5977 - 5985
Опубликована: Июль 11, 2024
Metal–organic
frameworks
(MOFs)
have
received
extreme
attention
for
their
applications
in
lithium-ion
batteries
due
to
large-specific
surface
area
and
adjustable
composition.
However,
the
limited
active
sites
low-ion
diffusion
of
MOF
limit
its
practical
applications.
In
this
article,
coordination
structure
SA–Cu–SQ
is
modulated
by
partially
substituting
acetic
acid
squaric
(SQ),
thereby
creating
unsaturated
exposing
some
metal's
sites.
The
electrochemical
tests
show
that
introduction
enables
possess
a
higher
capacity
(1012.5
mA
h
g–1
after
100
cycles
at
0.1
A
g–1)
than
Cu–SQ.
Furthermore,
kinetic
ex-situ
characterization
indicate
not
only
facilitates
Li+
but
also
generates
additional
Further
introducing
strategy
into
rhodizonic
(RA)
gave
SA–Cu–RA,
which
obtained
1126.9
g–1.
This
work
provides
avenues
construct
high-performance
materials.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 28, 2025
Abstract
Molybdenum
diselenide
(MoSe
2
),
a
promising
anode
material
for
potassium‐ion
batteries
(KIBs),
often
suffers
from
sluggish
kinetics,
substantial
volumetric
expansion,
and
dissolution
shuttling
of
intermediate
phases,
resulting
in
unsatisfactory
cycle
stability
rate
performance.
In
this
work,
dual‐defect
MoSe
(equipped
with
interlayer
defects
Se
vacancies)
is
introduced
by
novel
plasma‐induced
etching
process,
encapsulated
nitrogen‐doped
porous
carbon
nanofibers
(denoted
as
dd‐MoSe
2‐
x
@NC).
These
modifications
create
multidimensional
insertion
channels,
improve
ion
transfer
dynamics,
enhance
intrinsic
conductivity,
expose
more
reactive
sites.
Moreover,
the
matrix
mitigates
expansion
suppresses
potassium‐polyselenide
(K‐pSe
)
through
physicochemical
dual‐anchoring
strategy.
The
@NC
electrode
demonstrates
remarkable
electrochemical
performance,
achieving
high
specific
capacity
418.5
mAh
g
−1
at
0.05
A
,
reliable
cycling
over
1400
cycles
2.0
superior
performance
125.0
10.0
.
findings
elucidate
“intercalation‐conversion”
reaction
mechanism
show
that
@NC//PTCDA
full
cell
attains
energy
density
(115.8
W
h
kg
power
(1057.2
).
This
work
highlights
enhanced
potassium
storage
kinetics
layered
transition
metal
chalcogenides,
demonstrating
potential
high‐performance
KIBs.
Heteroatom-doped
carbon
materials
have
shown
great
potential
as
anodes
for
potassium
ion
hybrid
capacitors
(PIHCs)
thanks
to
their
diverse
merits.
However,
practicability
is
limited
seriously
by
sluggish
reaction
kinetics,
short
cycling
life,
and
low
initial
Coulombic
efficiency,
primarily
because
of
the
large
ionic
radius
K+
undesirable
side
reactions.
Herein,
cost-efficiency
low-softening-point
coal
pitch-derived
one-dimensional
N/S
co-doped
nanofibers
(N/S-CNFs)
are
smartly
devised
competitive
advanced
PIHCs.
The
as-optimized
N/S-CNF
anode
exhibits
a
compact
morphology,
abundant
functional
groups,
expanded
interlayer
spacing,
rendering
an
improved
efficiency
51.5%,
high
reversible
capacities
with
328.1
mAh
g-1
at
0.1
A
122.0
5.0
g-1,
robust
stability.
Theoretical
calculations
authenticate
that
co-doping
significantly
enhances
electric
conductivity
adsorption
capability
fiber
anodes.
Detailed
in-situ
X-ray
diffraction
measurement
unveils
intrinsic
electrochemical
K+-storage
process
N/S-CNFs.
Moreover,
assembled
PIHCs
depict
extremely
energy
density
106
Wh
kg-1
250
W
kg-1,
superb
performance
only
0.00016%
capacity
loss
per
cycle
within
10,000
cycles,
highlighting
practicality
our
fabricated
N/S-CNFs
next-generation
