ACS Applied Energy Materials,
Год журнала:
2025,
Номер
8(4), С. 1942 - 1963
Опубликована: Фев. 6, 2025
This
review
article
reports
an
overview
of
the
recent
developments
in
field
electron
delocalization
study
organic
conjugated
molecules
by
utilizing
vibration
frequencies
exhibited
attached
functional
groups
such
as
nitrile
(−C≡N),
alkyne
(−C≡C−),
or
carbonyl
(−C═O).
A
brief
introduction
to
delocalization,
methods
for
study,
and
their
importance
is
given
first,
followed
application
infrared
spectroscopy
molecules.
Details
with
various
reporter
have
been
explained
respective
subsections
based
on
groups.
All
reported
structured
presented
properties
studied
using
group.
Finally,
outlook
this
recently
promising,
exciting,
interesting
probing
provided.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(33)
Опубликована: Апрель 10, 2024
Abstract
Catalyzing
polysulfides
conversion
for
lithium‐sulfur
batteries
is
an
efficient
strategy
to
overcome
the
sluggish
kinetics
of
as
well
its
serious
shuttling
effect.
Due
multistep
and
complicated
phase
transformation
sulfur
species,
monofunctional
catalyst
can
hardly
promote
overall
redox
process.
Herein,
a
molybdenum‐based
heterostructure
proposed,
that
facilitates
entire
reduction
process
by
tandemly
catalyzing
liquid‐liquid
liquid‐solid
conversion.
It
uncovered
MoC
physiochemically
immobilizes
soluble
long‐chain
polysulfide
accelerates
between
S
8
Li
2
4
through
adsorbing
extending
S─S
bond
distance.
Then,
precipitation
enhanced
facilitating
migration
from
MoSe
.
This
driven
internal
electric
field
at
heterogeneous
interface
low
diffusion
energy
barrier
on
Li2S
Moreover,
MoC‐MoSe
exhibits
smallest
degree
disproportionation
throughout
Consequently,
cell
with
/C/S
cathode
delivers
initial
discharge‐specific
capacity
841.1
mAh
g
−1
long‐term
cycling
stability
attenuation
rate
0.08%
per
cycle
1.0
C.
work
presents
novelty
view
design
rational
multifunction
sequentially
accelerating
stepwise
polysulfides.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(49)
Опубликована: Авг. 29, 2024
Abstract
The
intricate
lithium
polysulfides
(LiPSs)
shuttle
and
uncontrollable
dendrite
growth
critically
hinder
the
commercialization
of
lithium−sulfur
(Li−S)
batteries.
rational
orderly
assignment
multi‐electron
induced
flow
is
critical
link
in
sulfer
redox
reaction.
Herein,
yolk‐shell
Fe
3
O
4
/FeP@C
heterostructure
nanoreactors
are
fabricated
to
modulate
electronic
structure,
including
spin‐related
charge
behavior
orbital
orientation
control,
which
can
demonstrate
interaction
between
catalytic
activity
spin‐state
conformation.
spin
splitting
induces
electron
transition
from
low‐spin
high‐spin,
where
non‐degenerate
orbitals
contribute
energy
level
up‐shift,
guiding
migration
FeP
,
activating
more
states
d
orbitals.
Spin
polarization
guides
sulfur
closed‐loop
conversion,
confirmed
by
DFT
simulations
situ
Raman.
Hence,
electrochemical
performances
remarkable
at
ultra‐high
current
density
loading.
Even
an
initial
specific
capacity
928.5
mAh
g
−1
a
Li−S
pouch
cell
reveals
practical
prospect
/FeP@C/PP
separator.
Li//Li
symmetric
cycles
steadily
for
4000
h,
confirming
interlayer
simultaneously
promotes
evolution
kinetics
sieves
ions.
This
work
deciphers
principles
spin‐orbit
coupling,
achieving
topological
modulation
“charge−spin−orbit”
toward
electrocatalysts.
Abstract
Lithium–sulfur
(Li–S)
batteries
have
attracted
significant
attention
in
the
realm
of
electronic
energy
storage
and
conversion
owing
to
their
remarkable
theoretical
density
cost‐effectiveness.
However,
Li–S
continue
face
challenges,
primarily
severe
polysulfides
shuttle
effect
sluggish
sulfur
redox
kinetics,
which
are
inherent
obstacles
practical
application.
Metal‐organic
frameworks
(MOFs),
known
for
porous
structure,
high
adsorption
capacity,
structural
flexibility,
easy
synthesis,
emerged
as
ideal
materials
separator
modification.
Efficient
interception/conversion
ability
rapid
lithium‐ion
conduction
enabled
by
MOFs
modified
layers
demonstrated
batteries.
In
this
perspective,
objective
is
present
an
overview
recent
advancements
utilizing
pristine
MOF
modification
separators
The
mechanisms
behind
enhanced
electrochemical
performance
resulting
from
each
design
strategy
explained.
viewpoints
crucial
challenges
requiring
resolution
also
concluded
Moreover,
some
promising
concepts
based
on
proposed
enhance
investigate
adsorption/conversion
mechanisms.
These
efforts
expected
contribute
future
advancement
advanced
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 17, 2024
Abstract
Catalytic
conversion
of
lithium
polysulfides
(LiPSs)
is
a
crucial
approach
to
enhance
the
redox
kinetics
and
suppress
shuttle
effect
in
lithium–sulfur
(Li–S)
batteries.
However,
roles
typical
heterogenous
catalyst
cannot
be
easily
identified
due
its
structural
complexity.
Compared
with
distinct
sites
single
atom
catalysts
(SACs),
each
active
site
(SSCs)
identical
uniform
their
spatial
energy,
binding
mode,
coordination
sphere,
etc.
Benefiting
from
well‐defined
structure,
iron
phthalocyanine
(FePc)
covalently
clicked
onto
CuO
nanosheet
prepare
low
spin‐state
Fe
SSCs
as
model
for
Li–S
electrochemistry.
The
periodic
polarizability
evolution
Fe‐N
bonding
probed
during
sulfur
reaction
by
situ
Raman
spectra.
Theoretical
analysis
shows
decreased
d‐band
center
gap
(Δd)
delocalization
d
xz
/d
yz
after
axial
click
confinement.
Consequently,
batteries
exhibit
capacity
decay
rate
0.029%
per
cycle
at
2
C.
universality
this
methodological
demonstrated
series
M
(M
=
Mn,
Co,
Ni)
similar
variation
electronic
configuration.
This
work
provides
guidance
design
efficient
electrocatalysis
