Molecules,
Год журнала:
2024,
Номер
29(24), С. 5906 - 5906
Опубликована: Дек. 14, 2024
Nickel
disulfide
(NiS2)
nanoparticles
are
encapsulated
within
nitrogen
and
sulfur
co-doped
carbon
nanosheets,
which
grown
onto
nanofibers
to
form
an
array
structure
(NiS2/C@CNF),
resulting
in
a
self-supporting
film.
This
not
only
prevents
the
agglomeration
of
NiS2
nanoparticles,
but
also
memorably
buffers
its
volume
changes
during
charge/discharge
cycles,
thereby
maintaining
structural
integrity.
The
co-doping
enhances
electronic
conductivity
facilitates
faster
ion
transport
backbone,
improving
low
NiS2/C@CNF
anodes.
Consequently,
electrode
exhibits
remarkable
rate
ability,
reaching
55.4%
capacity
at
5
A
g−1
compared
that
0.1
g−1,
alongside
impressive
cycling
stability,
with
89.9%
retention
over
1500
cycles
2
g−1.
work
underscores
efficacy
3D
backbone
encapsulation
strategy
for
enhancing
sodium
storage
property
transition
metal-based
ABSTRACT
Pitch
is
a
promising
precursor
for
preparing
carbon
materials
anode
of
sodium‐ion
batteries.
Heteroatom
doping
an
effective
way
to
increase
the
sodium
storage
capacity
while
constructing
reasonable
pores
and
nanosizing
skeleton
help
achieve
high‐rate
performance
anodes.
In
this
work,
sulfur‐doped
nanofibers
with
lotus
root‐like
axial
were
prepared
using
coal
liquefaction
pitch
as
main
by
electrospinning,
pre‐oxidation,
sulfurization,
carbonization.
A
considerable
content
7.41
wt.%
sulfur
was
doped
into
after
low‐temperature
gas‐phase
sulfurization
subsequent
The
as‐prepared
porous
nanofiber
films,
used
self‐supporting
electrodes
batteries,
display
high
specific
(528.5
mAh
g
−1
at
25
mA
),
(209.3
500
)
exceptional
cycling
stability
(96.97%
retention
over
1000
cycles).
With
desirable
flexibility
excellent
performance,
achieved
hold
great
promise
potential
applications
anodes
Abstract
Transition
metal
sulfides
are
investigation
hotspots
of
anode
material
for
sodium‐ion
batteries
(SIBs)
due
to
their
structural
diversity
and
high
storage
capacity.
However,
they
still
plagued
by
inevitable
volume
expansion
during
sodiation/desodiation
an
unclear
energy
mechanism.
Herein,
a
one‐step
sulfidation‐carbonization
strategy
is
proposed
in
situ
confined
growth
Cu
1.96
S
nanoparticles
nitrogen‐doped
carbon
(Cu
S@NC)
using
octahedral
metal–organic
framework
(Cu‐BTC)
as
precursor
investigate
the
driving
effect
current
collector
on
its
sodium
storage.
The
generation
S─C
bonds
S@NC
avoids
change
collapse
cycling
process
improves
adsorption
transport
capacity
Na
+
.
More
exciting,
species
self‐induced
forming
2
quantum
dots
enter
original
initial
few
charging
discharging
cycles,
which
unique
small‐size
abundant
edge‐active
sites
enhance
S.
Thus,
exhibits
superior
first
discharge
608.56
mAh
g
−1
at
0.2
A
with
Coulomb
efficiency
(ICE)
75.4%,
well
provides
excellent
rate
performance
long
cycle
durability
up
2000
cycles.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 12, 2024
Abstract
Transition
metal
sulfides
are
emerging
as
promising
anode
materials
for
sodium‐ion
batteries
(SIBs)
due
to
their
high
theoretical
capacity
and
low
cost,
practical
application
yet
face
critical
issues
of
sluggish
kinetics
poor
cycling
stability.
In
this
study,
a
reliable
approach
is
introduced
overcome
these
challenges
by
fabrication
Se
0.75
‐Fe
1‐x
S
0.25
@SC
hollow
nanospheres
thanks
the
enriched
robust
Fe─S─C,
C─S,
C─Se
bonding,
which
greatly
benefit
enhancing
both
reaction
structural
Kinetic
study
combining
with
in
situ
characterization
reveals
that
incorporation
rich‐Se
into
FeS
x
induces
formation
cationic
Fe
vacancies,
leading
abundant
sites
optimized
path
sodium
storage.
Density
functional
theory
calculations
also
demonstrate
how
Se‐rich
engineering
weakens
carbonaceous
polar
C─S─Fe
bonds
accelerates
dynamics.
The
as‐prepared
can
deliver
reversible
515
mAh
g
−1
at
2
A
over
1250
cycles
achieve
superior
rate
capability
maintaining
418
10
.
This
work
pioneers
concept
vacancy‐rich
functionalized
nanostructures,
offering
new
pathway
designing
advanced
electrode
energy
storage
devices.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(42), С. 57064 - 57073
Опубликована: Окт. 9, 2024
Development
of
room-temperature
sodium–sulfur
(RT
Na–S)
batteries
with
satisfactory
cycling
life
and
rate
capability
remains
challenging
due
to
the
unfavorable
electric
conductivity
from
S
species,
sluggish
redox
kinetics
conversion,
serious
shuttle
effects
sodium
polysulfides
(NaPSs).
To
address
these
issues,
a
phosphorus
nitrogen
dual-doped
hollow
porous
carbon
sphere
(PN-HPCs)
is
synthesized
as
hosts,
which
enhances
conductivity,
ion
diffusion,
conversion
polysulfides.
Such
hierarchically
structure
beneficial
accommodate
volume
variations
species
shorten
ion/electron
transfer
distances
during
electrochemical
reaction
process.
As
result,
S@PN-HPCs600
cathode
delivers
noticeable
performance
(313
mAh
g–1
after
4500
cycles
at
5.0
C,
capacity
degeneration
only
0.01%
per
cycle)
(646.4
g–[email protected]
527.5
g–[email protected]
C).
This
work
presents
an
efficient
strategy
based
on
structural
confinement
dual-heteroatom
doping
engineering
for
long-life
RT
Na–S
batteries.
The Journal of Chemical Physics,
Год журнала:
2025,
Номер
162(7)
Опубликована: Фев. 18, 2025
Carbonaceous
materials
have
demonstrated
extensive
potential
as
anodes
for
sodium
ion
batteries
(SIBs).
Nevertheless,
large-scale
commercial
use
is
severely
hampered
by
the
slow
reaction
kinetics
and
rapid
capacity
fading.
Heteroatom
doping
can
create
abundant
active
sites
to
improve
adsorption
properties
of
carbon
materials.
Here,
we
report
a
novel
nitrogen/boron
co-doped
nanosheet
(NB-CN)
with
N–B
bonds
efficient
Na+
storage.
B-doped
MIL-68
precursor
not
only
achieve
uniform
B
but
also
serve
nitrogen
site
form
bonds.
N,
co-doping
could
promote
improved
hydrophilicity,
while
2D
porous
structure
accelerate
transfer
kinetics.
Benefitting
from
synergistic
effect
dual-doping
hierarchical
porosity,
NB-CN
shows
storage
performance,
displays
high
307.1
mA
h
g−1
in
SIBs
at
0.1
A
g−1,
still
has
reversible
157
4
after
8000
cycles.
Moreover,
assembled
NB-CNs//Na3V2(PO4)3/C
full
cell
exhibits
application
prospect.
This
work
provides
an
insight
designing
dual-doped
high-performance
SIBs.
The Journal of Organic Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 28, 2025
An
effective
trifluoromethyl
radical
addition
to
the
thiocarbonyl
of
thioamide
derivatives
is
described,
which
produces
various
trifluoromethylthiolated
N-heterocycles
such
as
6-(trifluoromethylthio)phenanthridine,
2-(trifluoromethylthio)indole,
and
2-(trifluoromethylthio)benzothiazole
under
visible-light
irradiation.
The
process
features
advantages
mild
reaction
conditions,
a
cheap
easily
available
source
(CF3Br),
green
energy,
well
broad
substrate
scope.
mechanism
investigated
in
detail,
scale-up
experiments
are
performed.
Metal
single
atoms
are
widely
used
to
optimize
the
microstructure
of
carbon
materials
improve
their
ion
storage
capacity
and
rate
performance,
but
impact
on
another
key
parameter,
Coulombic
efficiency
(CE),
is
not
sufficiently
addressed
confirmed.
Herein,
a
universal
phenomenon
reported
that
carbon-loaded
asymmetric
sulfur-modified
metal-N4
moiety
(MN4-S,
M
=
Zn,
Fe,
Cu,
Ni)
possesses
higher
CE
than
symmetric
MN4
moiety,
this
applicable
various
matrices,
ions
(Li+,
Na+,
K+),
charge
discharge
rates,
electrolyte
formulations.
The
MN4-S
exhibits
larger
CEs
(0.03-0.46%
average
CEs,
4.2-28.4%
initial
CEs)
smaller
variance
compared
implying
better
reversible
stability.
mechanism
driving
revealed
by
ZnN4-S
sodium
process.
coordination
promotes
rapid
diffusion
kinetics
changing
density.
Meanwhile,
can
reduce
adsorption
energy
regulate
surface
chemical
reactivity
material
increase
reversibility
storage,
thereby
achieving
