ACS Applied Nano Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 10, 2024
As
an
important
compound
in
various
industries
and
metabolic
processes
the
human
body,
high
concentrations
of
hydrogen
peroxide
(H2O2)
can
cause
serious
injuries
to
humans
other
organisms.
Thus,
it
is
great
significance
develop
a
rapid,
sensitive,
practical
method
for
detection
H2O2.
Herein,
carbon
quantum
dot-mediated
CoAl-layered
double
hydroxide
(CQDs/CoAl-LDH)
was
decorated
on
hematite
(α-Fe2O3)
photoelectrode
via
simple
one-pot
hydrothermal
method.
The
resultant
CQDs/CoAl-LDH/α-Fe2O3
exhibited
excellent
photoelectrochemical
(PEC)
sensing
toward
H2O2
with
sensitivities
92.10
39.27
μA
mM–1
cm–2
linear
range
0.001–0.9
0.9–2
mM,
respectively,
low
limit
(0.02
μM,
S/N
=
3)
at
0
V
vs
SCE,
as
well
good
selectivity,
stability,
reproducibility,
reliability.
investigation
mechanism
revealed
that
CQDs
could
not
only
mediate
growth
CoAl-LDH
expose
active
sites
but
also
improve
electroconductivity
facilitate
charge
transfer,
while
rapidly
extract
photogenerated
holes
separation
provide
catalytic
oxidation.
synergistic
effect
significantly
boosted
PEC
activity
α-Fe2O3
strategy
boosting
performance
importance
semiconductor
photoelectrodes.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 8, 2024
N-doped
porous
carbon
materials
possess
abundant
pores
and
nitrogen
functionalities,
holding
significant
potential
for
supercapacitors.
However,
achieving
precise
control
of
the
pore
structure
to
enhance
electrochemical
performance
remains
challenging
in
large-scale
production
commercial
electrode
materials.
Herein,
Chinese
yam,
a
rhizome
plant
rich
dopamine,
is
selected
as
precursor
prepare
N,O-codoped
hierarchical
(N/O-PC-3)
via
one-step
carbonization
activation
process.
The
precisely
controlled
by
adjusting
degree
aggregation
zinc-containing
hydrolysates
biomass
through
synergistic
action
ZnCl2
(activating
agent)
NH4Cl
(nitrogen
source).
Due
its
micropore-dominant
structure,
high
(10.5
at.
%)
oxygen
(13.1
content,
along
with
good
electronic
conductivity
excellent
wettability,
N/O-PC-3
exhibits
remarkable
frequency
response,
an
ultrahigh
rate
up
5
V
s–1
gravimetric,
volumetric,
areal
capacitances
414
F
g–1,
311
cm–3,
23.8
μF
cm–2
at
1
A
respectively.
It
also
demonstrates
capability
(326
g–1
100
79%
capacitance
retention).
Even
mass
loading
15
mg
cm–2,
achieves
gravimetric
223
g–1.
assembled
symmetric
supercapacitor
delivers
energy
density
22.9
W
h
kg–1
power
102.9
kg–1,
making
it
highly
desirable
practical
application
storage.
Additionally,
this
work
offers
straightforward
approach
controlling
Green Chemistry,
Год журнала:
2024,
Номер
26(8), С. 4633 - 4644
Опубликована: Янв. 1, 2024
It
is
critical
to
prepare
self-supported
carbonaceous
electrode
materials
that
enable
high-mass
loading
and
efficient
ion/electron
transport
through
a
simple
sustainable
method.
Abstract
This
work
is
the
first
attempt
to
explore
supercapacitor
applications
of
Barium
nickelate
(BaNiO
3
)
perovskite
nanoparticles.
The
nanoparticles
are
synthesized
using
a
simple
combustion
method
and
their
morphology,
elemental
composition,
so
forth
studied
standard
characterization
methods
such
as
x‐ray
diffraction
spectroscopy
(XRD),
field
emission
scanning
electron
microscopy
(FESEM),
forth.
were
found
be
hexagonal
in
shape,
with
an
average
particle
size
16
nm,
analysis
confirms
successful
synthesis
BaNiO
For
electrochemical
studies,
electrodes
fabricated
over
wearable
flexible
conductive
fabric
(CF)
substrate.
A
slurry
paste
applied
CF
dried
overnight,
thereby
forming
thin
film
electrode.
electrode
acts
positive
high
specific
capacitance
508.64
F
g
−1
at
2.2
current
density.
Upon
increasing
density,
maintains
60%
its
displays
97%
cyclic
stability
5000
cycles.
impedance
(EIS)
study
indicates
excellent
conductivity
electrode,
bulk
resistance
3.2
Ohms.
performance
also
compared
various
previously
reported
works
higher
better
stability.
These
findings
suggest
that
nanoparticles‐based
holds
promise
for
utilization
anode
material
applications.
ABSTRACT
Cobalt
nickel
sulfide
(Ni‐Co‐S),
a
typical
bimetallic
sulfide,
is
regarded
as
promising
electrode
material
for
supercapacitors
(SCs).
In
this
study,
the
electrodeposition
process
employed
to
grow
vertically
aligned
Ni‐Co‐S
nanosheets
on
carbon
film
(CF)
substrate
derived
from
cotton
fabrics.
The
conductive
and
porous
CF
not
only
ensures
uniform
distribution
of
but
also
offers
an
efficient
pathway
transportation
electrons
electrolyte
ions.
nanosheet
arrays,
characterized
by
their
small
thickness
open
pores,
facilitate
provide
rapid
diffusion
path
ions
expose
sufficient
active
surfaces
charge
storage.
synergistic
effect
resulting
rational
combination
endows
with
high
areal
capacitance
1800
mF
cm
−2
at
2
mV
s
−1
remarkable
mechanical
flexibility.
Furthermore,
when
all‐solid‐state
asymmetric
SC
device
assembled,
energy
density
324.1
mWh
achieved
power
2252.4
mW
.
Industrial & Engineering Chemistry Research,
Год журнала:
2024,
Номер
63(18), С. 8239 - 8249
Опубликована: Апрель 25, 2024
Carbon/transition
metal
oxide
composites
exhibit
promising
potential
as
electrode
materials
for
energy
storage,
but
regulating
their
interfacial
composite
structures
remains
a
formidable
challenge.
In
this
work,
we
develop
lignosulfonate-assisted
synthesis
strategy
to
fabricate
porous
carbon-supported
MnO2
(LSC/MnO2-2)
with
robust
interface
asymmetric
supercapacitors
(ASCs).
The
functionalized
lignin
carbon,
achieved
through
π–π
interactions
lignosulfonate,
exhibited
improved
dispersibility,
thereby
facilitating
the
deposition
of
onto
carbon
matrix.
Consequently,
LSC/MnO2-2
demonstrates
uniform
loading
and
enhanced
bonding.
interaction
between
Mn
sites
lignosulfonate-functionalized
substrate
can
promote
electron
transfer
ion
kinetics,
effectively
activating
electrochemical
activity
MnO2.
as-prepared
high
specific
capacitances
750
F/g
at
0.5
A/g
400
10.0
in
1
M
KOH
electrolyte.
Furthermore,
assembled
ASC
exhibits
an
outstanding
density
54.4
Wh/kg
998.2
W/kg
excellent
cyclic
stability
(94.7%
retention
over
10,000
cycles
2.0
A/g).
This
study
presents
alternative
method
precisely
control
oxides
materials,
aiming
enhance
performance
composites.
RSC Advances,
Год журнала:
2024,
Номер
14(19), С. 13190 - 13199
Опубликована: Янв. 1, 2024
The
reasonable
construction
of
one-dimensional
(1D)/two-dimensional
(2D)
hybrid
dimensional
porous
carbon
materials
with
complementary
advantages
and
disadvantages
is
an
important
approach
to
addressing
the
structural
performance
deficiencies
single
materials,
while
also
significantly
improving
electrochemical
super-capacitors.
In
this
study,
1D
hollow
tubular/2D
nanosheet
was
synthesized
through
one-step
carbonization
using
fibrous
brucite
2D
layered
magnesium
carbonate
hydroxide
as
templates.
By
adjusting
feed
ratio
templates,
morphology,
pore
structure
specific
surface
area
(SSA)
prepared
were
controlled.
carbons
characterized
scanning
electron
microscope
(SEM),
X-ray
diffraction
(XRD),
photoelectron
spectroscopy
(XPS)
nitrogen
adsorption-desorption.
And
their
studied
by
cyclic
voltammograms
(CV),
galvanostatic
charge/discharge
(GCD)
impedance
(EIS).
results
show
that
use
templates
different
dimensions
influences
structure,
SSA
carbon.
(3F)
exhibits
a
high
capacitance
excellent
cycling
stability.
3F
demonstrates
245.3
F
g
