Abstract
2D
MXene
nanoflakes
usually
undergo
serious
restacking,
that
easily
aggravates
during
the
traditional
vacuum‐assisted
filtration
process;
and
thus,
hinders
electrochemical
performance
of
corresponding
film
electrodes.
Herein,
3D
porous
compact
1D/2D
Fe
2
O
3
/MXene
aerogel
electrode
with
an
enhanced
is
fabricated
by
freeze‐drying
assisted
mechanical
pressing.
An
introduction
1D
α‐Fe
nanorods
can
not
only
alleviate
restacking
but
also
provide
additional
pseudocapacitance
for
composite
system.
Thus,
resulting
shows
specific
capacitance
182
F
g
−1
(691
mF
cm
−2
)
at
a
current
density
1
A
in
m
H
SO
4
electrolyte
as
well
81.74%
retention
after
10
000
charge–discharge
cycles.
Besides,
addition
has
significant
contribution
volumetric
(150
−3
),
which
2.68
times
pure
(56
).
Moreover,
all‐solid‐state
symmetric
supercapacitor
(SSSC)
delivers
superior
areal
energy
3.61
µWh
power
119.04
µW
.
This
rapid‐forming
porous,
binder‐free,
freestanding
provides
progressive
strategy
fabrication
MXene‐based
supercapacitors.
Abstract
Electrocatalytic
water
splitting
is
a
promising
and
viable
technology
to
produce
clean,
sustainable,
storable
hydrogen
as
an
energy
carrier.
However,
meet
the
ever‐increasing
global
demand,
it
imperative
develop
high‐performance
non‐precious
metal‐based
electrocatalysts
for
oxygen
evolution
reaction
(OER),
OER
considered
bottleneck
electrocatalytic
splitting.
Spinels,
in
particular,
are
due
their
unique
properties,
precise
structures,
compositions.
Herein,
recent
progress
on
application
of
bimetallic‐based
spinels
(AFe
2
O
4
,
ACo
AMn
;
where
A
=
Ni,
Co,
Cu,
Mn,
Zn)
presented.
The
fundamental
concepts
highlighted
after
which
family
spinels,
general
formula,
classifications
introduced.
This
followed
by
overview
various
developments
applications
electrocatalysts,
with
special
emphasis
enhancing
strategies
that
have
been
formulated
improve
performance
these
spinels.
In
conclusion,
this
review
summarizes
all
studies
mentioned
therein
provides
challenges
future
perspectives
spinel
electrocatalysts.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(40)
Опубликована: Май 17, 2024
Abstract
For
the
sustainable
growth
of
future
generations,
energy
storage
technologies
like
supercapacitors
and
batteries
are
becoming
more
common.
However,
reliable
high‐performance
materials’
design
development
is
key
for
widespread
adoption
supercapacitors.
Quantum
dots
with
fascinating
unusual
properties
expected
to
revolutionize
technologies.
while
recent
discovery
quantum
honored
a
Nobel
prize
in
Chemistry,
their
benefits
tenacious
problem
not
realized
yet.
In
this
context,
herein,
chemical‐composition
tuning
enabled
exceptional
performance
NiCo
2
O
4
(NCO)/graphene
(GQDs)
reported,
which
outperform
existing
similar
materials,
A
comprehensive
study
performed
on
synthesis,
characterization,
electrochemical
evaluation
highly
functional
NCO/GQDs
delivering
enhanced
efficiency.
The
high‐performance,
electrode
materials
synthesized
by
incorporation
GQDs
into
NCO.
effect
variable
amount
characteristics
studied
systematically.
In‐depth
structural
chemical
bonding
analyses
using
X‐ray
diffraction
(XRD)
Raman
spectroscopic
studies
indicate
that
all
composites
crystallize
spinel
cubic
phase
graphene
integration
evident
NCO/GQDs.
scanning
electron
microscopy
imaging
analysis
reveals
homogeneously
distributed
spherical
particles
size
distribution
5–9
nm
validating
formation
QDs.
high‐resolution
transmission
reveal
NCOQDs
anchored
sheets,
provide
high
surface
area
42.27
m
g
−1
mesoporosity
composition
NCO/GQDs‐10%.
addition
establishing
electrical
connection
3D‐conductive
channels
rapid
transport
throughout
as
well
synergistic
effects.
Chemical‐composition
tuning,
optimization
yields
NCO/GQDs‐10%
deliver
best
specific
capacitance
3940
Fg
at
0.5
Ag
,
where
electrodes
retain
≈98%
after
5000
cycles.
NCO/GQD‐10%//AC
asymmetric
supercapacitor
device
demonstrates
outstanding
density
power
values
118.04
Wh
kg
798.76
W
respectively.
NCO/GQDs‐10%//NCO/GQDs‐10%
symmetric
delivers
excellent
24.30
500
These
results
demonstrate
conclude
prospective
candidates
developing
next‐generation
devices.
Journal of Energy Storage,
Год журнала:
2024,
Номер
84, С. 110717 - 110717
Опубликована: Фев. 16, 2024
Binary
metal
oxides
exhibit
a
compelling
combination
of
features
that
make
them
highly
attractive
electrode
materials
for
supercapacitors.
Herein,
facile
hydrothermal
method
is
employed
the
preparation
defect-rich
hierarchical
nanostructured
NiCo2O4
with
various
morphologies,
including
urchin-like
nanostructure,
nanoflowers,
and
2D
nanosheets;
their
electrochemical
performances
as
electrodes
hybrid
supercapacitor
are
studies.
Notably,
based
on
nanostructure
high
oxygen
vacancies
delivers
gravimetric
energy
density
45.2
Wh/kg
at
power
750
W/kg,
maintaining
remarkable
cycling
stability.
The
exhibits
specific
capacitance
423.9
292.0
F/g
current
1.5
7.5
A/g,
respectively,
capacitive
retention
≈
94
%
after
1500
cycles.
Crystalline
defects
identified
in
suggested
to
significantly
contribute
ionic/electrical
conductivity
stability
electrodes.
Journal of Materials Chemistry A,
Год журнала:
2020,
Номер
8(40), С. 21044 - 21052
Опубликована: Янв. 1, 2020
P-CoMoO4
with
boosted
interface
reaction
activity
and
kinetics
is
first
employed
as
a
cathode
material
for
high-performance
aqueous
zinc-ion
batteries.
Nano-Micro Letters,
Год журнала:
2020,
Номер
12(1)
Опубликована: Июнь 8, 2020
Abstract
Non-enzymatic
biosensors
based
on
mixed
transition
metal
oxides
are
deemed
as
the
most
promising
devices
due
to
their
high
sensitivity,
selectivity,
wide
concentration
range,
low
detection
limits,
and
excellent
recyclability.
Spinel
NiCo
2
O
4
have
drawn
considerable
attention
recently
outstanding
advantages
including
large
specific
surface
area,
permeability,
short
electron,
ion
diffusion
pathways.
Because
of
rapid
development
non-enzyme
biosensors,
current
state
methods
for
synthesis
pure
composite/hybrid
materials
subsequent
electrochemical
biosensing
applications
systematically
comprehensively
reviewed
herein.
Comparative
analysis
reveals
better
sensing
bioanalytes
by
one-dimensional
two-dimensional
nano-/microstructures
than
other
morphologies.
Better
efficiency
compared
corresponding
individual
oxides,
viz.
NiO
Co
3
,
is
attributed
close
intrinsic-state
redox
couples
Ni
3+
/Ni
2+
(0.58
V/0.49
V)
/Co
(0.53
V/0.51
V).
Biosensing
performance
also
significantly
improved
making
composites
with
conducting
carbonaceous
like
graphene,
reduced
graphene
oxide,
carbon
nanotubes
(single
multi-walled),
nanofibers;
polymers
polypyrrole
(PPy),
polyaniline
(PANI);
NiO,
SnO
MnO
;
metals
Au,
Pd,
etc.
Various
factors
affecting
morphologies
parameters
nano-/micro-structured
highlighted.
Finally,
some
drawbacks
future
perspectives
related
this
field
outlined.
