Langmuir,
Journal Year:
2024,
Volume and Issue:
40(24), P. 12697 - 12708
Published: June 6, 2024
Polysulfides
are
easily
dissolved
in
the
electrolyte
of
Li–S
batteries
after
long
cycles.
Sn
atom
modification
electrodes
beneficial
for
improving
cycling
stabilities
batteries.
However,
influence
atoms
on
structure
and
electrochemical
performance
SnO2/C
composite
materials
is
not
explored.
Sn/SnO2/C
developed
as
sulfur
carriers
our
work.
In
addition,
stability
mechanism
Sn/SnO2/C/S
also
elucidated.
Results
show
that
introduced
display
good
(420.1
mAh·g–1
at
1C
1000
cycles)
The
load
80
wt
%
(2
mg–1·cm–2).
introduction
into
plays
three
roles.
first
role
to
enhance
structural
SnO2.
second
help
adsorb
active
ions.
last
promote
electron
transportation
ability
during
initial
discharging/charging
process.
inhibiting
dissolution
polysulfides
electrolytes
Li-S
batteries
are
potentially
interesting
alternatives
for
green
energy
applications
due
to
their
high
density
and
low
cost.
Nonetheless,
present
practical
application
falls
short
of
theoretical
predictions,
despite
efforts
address
volumetric
expansion
enhance
electrical
conductance
through
porous
sulfur-hosting
scaffolds.
The
performance
is
mainly
restricted
by
the
poor
electrochemical
reaction
kinetics
lithium
polysulfides
(LiPS),
which
convert
into
sulfide
(Li2S)
elemental
sulfur
(S)
during
charge-discharge
cycles.
Single-atom
catalysts
(SACs)
offer
novel
opportunities
addressing
complex
challenges
effective
in
atomic-resolution
characterization
intermediates
as
well
precise
atomic-level
engineering.
Inspired
single-atom
catalysis
approach,
we
designed
an
innovative
electrocatalyst
including
FeN4
active
sites
anchored
2D
borophene
nanosheets.
significant
electronic
coupling
between
Fe
3d
S
2p
orbitals
promotes
charge
transfer
improves
redox
dynamics
polysulfide
intermediates.
Moreover,
unique
properties
borophene,
its
mass
density,
superior
conductivity,
rapid
Li-ion
transport,
robust
binding
with
polysulfides,
render
it
a
promising
choice
battery
materials.
synergistic
effect
adsorption
improved
kinetics,
enabled
configuration
three-dimensional
architecture
FeN4/borophene
(Fe@BNS),
results
outstanding
batteries.
fabricated
cells
exhibit
exceptional
long-term
cycle
life
(1180
mAh
g−1
at
1
C
1000
cycles)
high-rate
(790.3
C)
loading
6.5
mg
cm−2.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 25, 2025
Abstract
The
rational
design
of
abundant
and
efficient
active
sites
for
lithium‐sulfur
electrocatalysis
remains
a
long‐standing
challenge,
wherein
the
optimization
catalyst
activity
by
manipulating
their
sizes
has
stimulated
extensive
exploration.
Herein,
fine‐grain
strengthening
strategy
is
proposed
vanadium‐nitrogen‐carbon
(VNC)
comprising
vanadium
(V)‐based
units,
throughout
modulating
size
surface
energy
via
salt‐template
recrystallization.
recrystallization
frequency
dictated
to
precisely
tune
effect.
Through
rigorous
procedure
5‐time
recrystallization,
V‐based
units
realize
reduction
from
209
99
Å,
increase
0.16
0.32
eV
Å
−2
,
along
with
specific
area
adjustment
41.5
206.3
m
2
g
−1
.
Accordingly,
effect
effectively
activates
in
i)
enhancing
sulfur
species
adsorption
propelling
Li
S
nucleation/decomposition
reaction
kinetics;
ii)
guiding
high‐flux
uniform
lithium‐ions
thus
promoting
lithium
plating/stripping
behaviors.
Consequently,
battery
demonstrates
an
initial
discharge
capacity
1236.4
mA
h
at
0.2
C.
Even
after
600
cycles
2.0
C,
cycle‐to‐cycle
attenuation
merely
0.048%.
Furthermore,
pouch
cell
strengthened
VNC
can
proceed
stable
cycling
operation
1.0
ensuring
reliable
consistent
power
supply
electronic
gadgets.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 17, 2024
Abstract
The
pursuit
of
sustainable
practices
through
the
chemical
recycling
polyamide
wastes
holds
significant
potential,
particularly
in
enabling
recovery
a
range
nitrogen‐containing
compounds.
Herein,
we
report
novel
strategy
to
upcycle
tertiary
amines
with
assistance
H
2
acetic
acid
under
mild
conditions
(e.g.,
180
°C),
which
is
achieved
over
anatase
TiO
supported
Mo
single
atoms
and
Rh
nanoparticles.
In
this
protocol,
first
converted
into
diacetamide
intermediates
via
acidolysis,
are
subsequently
hydrogenated
corresponding
carboxylic
monomers
100
%
selectivity.
It
verified
that
nanoparticles
work
together
activate
both
amide
bonds
intermediate,
synergistically
catalyze
its
hydrodeoxygenation
form
amine,
but
catalyst
ineffective
for
hydrogenation
acid.
This
presents
an
effective
way
reconstruct
various
acids,
may
have
promising
application
potential.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 30, 2024
Abstract
Lithium–Sulfur
batteries
(LSBs)
are
widely
regarded
as
one
of
the
most
promising
energy
storage
systems
due
to
their
ultra‐high
theoretical
density
and
environmental
friendliness.
However,
practical
applications
LSBs
face
significant
challenges,
including
shuttle
effect
soluble
polysulfides
formation
lithium
dendrites.
Covalent
organic
frameworks
(COFs)
have
emerged
potential
materials
for
inhibiting
polysulfide
buffering
This
review
provides
an
overview
latest
advancements
in
use
COF
its
derivative
sulfur
host
materials,
modified
commercial
separators,
electrolytes
LBSs,
makes
some
brief
conclusions
predictions.
Pure
COFs,
derivatives,
composites
discussed
hosts,
along
with
novel
strategies
intended
enhance
LSB
cycling
stability
reversibility.
Strategies
enhancing
performance
summarized
through
modification
separators
using
ultimate
goal
achieving
high
density.
It
also
discusses
designing
COF‐based
electrolytes,
which
include
structural
design,
ionic
introduction
salt
molecules
or
flexible
oligo(ethylene
oxide)
chains
into
skeletons.
Additionally,
future
prospects
COFs
derivatives
LSBs.
Langmuir,
Journal Year:
2024,
Volume and Issue:
40(24), P. 12697 - 12708
Published: June 6, 2024
Polysulfides
are
easily
dissolved
in
the
electrolyte
of
Li–S
batteries
after
long
cycles.
Sn
atom
modification
electrodes
beneficial
for
improving
cycling
stabilities
batteries.
However,
influence
atoms
on
structure
and
electrochemical
performance
SnO2/C
composite
materials
is
not
explored.
Sn/SnO2/C
developed
as
sulfur
carriers
our
work.
In
addition,
stability
mechanism
Sn/SnO2/C/S
also
elucidated.
Results
show
that
introduced
display
good
(420.1
mAh·g–1
at
1C
1000
cycles)
The
load
80
wt
%
(2
mg–1·cm–2).
introduction
into
plays
three
roles.
first
role
to
enhance
structural
SnO2.
second
help
adsorb
active
ions.
last
promote
electron
transportation
ability
during
initial
discharging/charging
process.
inhibiting
dissolution
polysulfides
electrolytes
