ACS Applied Nano Materials,
Год журнала:
2024,
Номер
7(7), С. 7172 - 7183
Опубликована: Март 21, 2024
Lithium–sulfur
(Li–S)
batteries
have
received
continuous
attention
due
to
their
high
theoretical
specific
capacity.
However,
the
shuttle
effect
of
lithium
polysulfides
(LiPSs)
severely
limits
its
development.
Modification
commercial
polypropylene
(PP)
separators
is
regarded
as
an
effective
strategy
suppress
effect.
In
this
paper,
NiFe-PBA-derived
carbon-based
porous
bimetallic
phosphide
(NFP)
was
inserted
into
carbon
nanotube
(CNT)
networks,
and
these
composites
were
utilized
modify
PP
separator.
CNT
networks
provide
abundant
pathways
electron
transport
improve
conductivity
S
cathode
Li2S.
Ni2P
Fe2P
in
NFP
exhibit
robust
chemisorption
catalytic
effects
on
LiPSs.
Moreover,
structures
beneficial
for
Li+
immigration.
The
synergistic
enable
modified
separator
obtain
a
electrical
conductivity,
superior
adsorption
capability,
enhanced
performance.
Assembled
Li–S
show
initial
discharge
capacity
1244
mAh
g–1
at
0.2
C.
Notably,
highest
discharge-specific
reached
up
938.9
1
C,
average
decay
rate
per
cycle
after
300
cycles
mere
0.067%.
This
study
paves
way
research
pathway
harnessing
transition
metal
phosphides
materials
separators,
offering
realize
high-performance
batteries.
Advanced Materials,
Год журнала:
2024,
Номер
36(25)
Опубликована: Апрель 3, 2024
Abstract
The
catalytic
activation
of
the
Li‐S
reaction
is
fundamental
to
maximize
capacity
and
stability
batteries
(LSBs).
Current
research
on
catalysts
mainly
focuses
optimizing
energy
levels
promote
adsorption
conversion,
while
frequently
overlooking
electronic
spin
state
influence
charge
transfer
orbital
interactions.
Here,
hollow
NiS
2
/NiSe
heterostructures
encapsulated
in
a
nitrogen‐doped
carbon
matrix
(NiS
@NC)
are
synthesized
used
as
additive
sulfur
cathodes.
heterostructure
promotes
splitting
3d
orbital,
driving
Ni
3+
transformation
from
low
high
spin.
This
configuration
raises
level
activates
state.
accelerates
optimizes
energy,
lowering
barrier
polysulfides
conversion.
Benefiting
these
characteristics,
LSBs
based
@NC/S
cathodes
exhibit
initial
(1458
mAh·g⁻
1
at
0.1C),
excellent
rate
capability
(572
5C),
stable
cycling
with
an
average
decay
only
0.025%
per
cycle
1C
during
500
cycles.
Even
loadings
(6.2
mg·cm⁻
),
capacities
1173
(7.27
mAh·cm⁻
)
measured
0.1C,
1058
retained
after
300
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 26, 2024
Abstract
The
development
of
efficient
oxygen
evolution
reaction
(OER)
electrocatalysts
is
critical
to
overcome
the
efficiency
bottleneck
in
hydrogen
generation
via
water
electrolysis.
Hollow
nanostructured
materials
have
emerged
as
a
hot
topic
for
electrocatalysis
research
because
their
advantages,
including
abundant
active
sites,
large
contact
area
between
catalyst
and
electrolyte,
short
transmission
path.
As
highly
stable
OER
electrocatalysts,
cobalt‐based
attracted
more
attention.
In
this
work,
cobalt
metal/cobalt
phosphides/nitrogen‐doped
carbon
composites
(Co‐Co
x
P/NC)
with
hierarchical
hollow
structure
are
designed
by
using
ZIF‐67
microspheres
precursors.
By
coating
ZIF‐8
on
surface
further
carbonizing,
nanowhiskers
successfully
formed
spheres
under
catalytic
effect
Co
nanoparticles
at
high
temperature.
subsequent
phosphating
process,
solid
nanocrystalline
particles
transformed
into
core–shell
CoP
2
P
account
Kirkendall
effect.
Through
optimization
microstructure
material
synergistic
transition
metal,
metal
phosphide,
nitrogen
doping,
overpotential
optimal
only
287
mV
10
mA
cm
−2
current
density
1
m
KOH.
Analytical Chemistry,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 13, 2024
The
inherent
metal
elements
and
structures
of
Prussian
blue
analogue
(PBA)
nanozymes
have
restricted
their
enzyme-mimicking
activity.
Therefore,
the
rational
regulation
PBA
to
improve
catalytic
activity
is
highly
desirable
for
biosensing
applications.
Herein,
we
propose
a
structure
remodeling
strategy
construct
an
open-cage
Fe
PBA-anchored
NiFePBA
(NiFe@Fe
bis-PBA)
nanozyme
with
significantly
enhanced
formation
process
mechanism
this
bis-PBA
were
studied
in
detail.
Specifically,
cubic
precursor
was
first
synthesized
modified
polyvinylpyrrolidone
(PVP).
With
aid
hydrochloric
acid,
added
potassium
ferricyanide
reduced
by
PVP
re-coordinated
on
surface
form
NiFe@Fe
special
core-shell
structure.
resultant
further
exploited
immobilize
secondary
antibodies,
serving
as
novel
signal
probe
developing
sensitive
electrochemical
immunosensors
monitoring
tumor
markers.
constructed
immunosensor
possesses
very
wide
linear
range
0.005-100
ng/mL
low
detection
limit
0.89
pg/mL
alpha-fetoprotein
high
specificity
acceptable
reproducibility
stability.
This
work
offers
general
promising
favorable
element
distribution,
which
enhances
properties
applications
different
fields.
