The
fast
OH-
transfer
between
hydroxide
layers
is
the
key
to
enhancing
charge
storage
efficiency
of
layered
double
hydroxides
(LDH)-based
supercapacitors
(SCs).
Constructing
interlayer
reactive
sites
in
LDH
much
expected
but
still
a
huge
challenge.
In
this
work,
CdS
nano-dots
(NDs)
are
introduced
interlayers
ultra-thin
NiFe-LDH
(denoted
CdSinter.
-NiFe-LDH),
promoting
ions
flow
for
higher
redox
activity.
excellent
performance
not
only
due
enlarged
layer
spacing
(from
0.70
0.81
nm)
also
stems
from
anchored
units
and
undamaged
original
structure
LDH,
which
contribute
improvement
diffusion
coefficient
(1.6
×
10-8
cm2
s-1
)
electrochemical
active
area
(601
mF
cm-2
better
than
that
NDs
on
surface
(2.1
10-9
350
).
champion
-NiFe-LDH
electrode
displays
high
capacitance
3330.0
F
g-1
at
1
A
retention
90.9%
10
,
with
(1966.6
Moreover,
assembled
asymmetric
SCs
(ASC)
device
demonstrate
an
outstanding
energy
density/power
density
(121.56
Wh
kg-1
/754.5
W
ACS Applied Nano Materials,
Год журнала:
2023,
Номер
6(12), С. 10804 - 10816
Опубликована: Июнь 7, 2023
Transition
metal
layered
double
hydroxides
(LDHs)
with
high
theoretical
specific
capacity
and
abundant
redox
active
centers
are
considered
as
ideal
cathode
materials
for
asymmetric
supercapacitors,
but
limited
surface
area
(SSA)
low
conductivity
hinder
its
electrochemical
performance.
Herein,
NiCo-LDH
nanosheets
were
synthesized
by
simple
one-step
ion
exchange
co-precipitation
method
at
room
temperature
using
Co-ZIF-L
the
precursor.
Subsequently,
Co3S4
nanoparticles
grown
on
controlling
amount
of
sulfur
addition,
thus
constructing
NiCo-LDH/Co3S4
composites
heterogeneous
structures.
The
large
SSA
provided
more
pseudocapacitance
reaction,
resulting
in
obtaining
good
rate
capability
(728.1
C
g–1
1
A
452.9
20
g–1).
In
assembled
supercapacitor
(NiCo-LDH/S-100//AC)
achieved
a
superior
energy
density
(35.21
Wh
749.98
W
kg–1),
showing
considerable
potential
practical
applications.
ACS symposium series,
Год журнала:
2024,
Номер
unknown, С. 3 - 42
Опубликована: Апрель 17, 2024
Carbon
quantum
dots
(CQDs)
belong
to
a
remarkable
category
of
nanocarbon
materials
with
unique
properties
because
their
nanoscale
dimensions.
These
nanocarbons
have
earned
significant
attention
exceptional
and
advantages,
making
them
versatile
in
wide
range
applications.
This
chapter
delves
into
the
fundamental
principles
underlying
CQDs,
along
synthetic
procedures
outstanding
characteristics.
characteristics
empower
precise
tuning
optical
electronic
properties,
setting
stage
for
diverse
Their
photoluminescence—combined
biocompatibility,
water
solubility,
various
surface
functional
groups—position
CQDs
as
crucial
components
fields
nanotechnology,
science,
medicine.
As
result,
this
highlights
broad
spectrum
applications
where
made
contributions
21st
century.
ACS Applied Energy Materials,
Год журнала:
2024,
Номер
7(13), С. 5508 - 5516
Опубликована: Июнь 20, 2024
The
electrodeposition
process
is
a
low-cost,
high-efficiency,
and
binder-free
route
to
synthesize
layered
double
hydroxides
(LDHs)
for
high-performance
supercapacitors.
However,
the
disordered
growth
of
LDH
nanosheets
in
direct
would
limit
exposure
active
sites
easily
cause
collapse
during
cycling.
Here,
we
report
kind
positively
charged
carbon
dots
(p-CDs)
that
induce
ordered
ultrathin
hierarchical
nanostructures
one-step
process.
precise
regulation
NiCo-LDH
surface
morphology
was
achieved
by
changing
concentration
p-CDs,
which
could
adsorb
NO3–
electrolyte
electrodeposition.
as-prepared
electrode
delivers
an
enhanced
specific
capacitance
1896
F
g–1
at
1
A
excellent
rate
performance
(87.6%
retention
20
g–1).
supercapacitor
based
on
composite
LDH/CDs
exhibits
high
energy
density
46.06
Wh
kg–1
with
power
750
W
remarkable
cycle
stability
(78.3%
after
30,000
cycles
5
This
research
presents
successful
example
CD
application
electrochemical
storage.
