Journal of The Electrochemical Society,
Год журнала:
2024,
Номер
171(11), С. 117502 - 117502
Опубликована: Янв. 11, 2024
Ferrites
are
effectively
used
in
electrochemical
uric
acid
(UA)
sensing
applications.
Herein,
we
synthesised
cobalt
ferrite
(CoFe
2
O
4
)
nanoparticles
by
one
step
solution
combustion
method.
The
prepared
CoFe
was
coated
on
nickel
foam
(NF)
substrate
to
fabricate
the
electrode
and
tested
using
phosphate
buffer
saline
(PBS).
small
crystallite
size
of
14
nm
as
well
large
area
active
sites
0.139
cm
contributed
towards
enhanced
sensitivity
0.735
mA.mM
−1
−2
.
limit
detection
(LOD)
@NF
sensor
is
26.24
μM.
UA
occurs
an
adsorption-controlled
kinetics
electrostatic
interaction
at
a
pH
∼7.2
where
anion
negatively
charge
while
surface
positively
charged
it
displays
quasi-reversible
reaction.
Additionally,
repeatability,
selectivity,
reproducibility
were
investigated.
real-time
application
validated
spot-urine,
commercial
milk
Barracuda
fish
samples,
which
show
recovery
percentage
between
99.5%
101.8%.
shelf-life
observed
be
28
days.
Hence,
this
highly
sensitive
can
for
clinical
diagnosis
hyperuricemia
food
safety
purposes.
Journal of The Electrochemical Society,
Год журнала:
2024,
Номер
171(5), С. 057505 - 057505
Опубликована: Апрель 29, 2024
Uric
acid
(UA)
is
an
important
biomarker
in
blood
to
diagnosis
diseases
linked
with
hyperuricemia.
Although
several
detection
methods
exist
for
UA
sensing,
electrochemical
method
has
emerged
as
a
promising
alternative.
For
effective
performance
of
biosensor,
the
choice
electroactive
material
plays
crucial
role.
The
developed
electrodes
are
enzymatic
and
non-enzymatic
modified
nano-structures
metal
oxides,
ferrites
carbon-based
materials.
Several
combinations
nanocomposites
using
oxides
compounds
show
results
biosensor
applications.
This
attributed
its
functional
groups,
higher
surface
area
porous
nature
that
can
improve
sensing
it
requires
only
quick-time
processing
inexpensive
direct
methods.
uses
anodic
peak
current
which
analytical
signal
sense
oxidation
UA.
technique
paves
new
way
make
point-of-detection
devices
near
future.
It
could
be
next
generation
non-invasive
analysis
food
hygiene
well
biomedical
clinical
review
focuses
on
materials
used
discusses
application
different
techniques
detection.
Applied Organometallic Chemistry,
Год журнала:
2025,
Номер
39(4)
Опубликована: Март 24, 2025
ABSTRACT
Taking
into
account
the
harmful
influence
of
superfluous
nitrite
content
onto
ecosystem
and
human
health,
sensitive
real‐time
estimation
its
concentration
by
developing
reduced
cost
efficient
catalytic
surfaces
seems
as
a
vital
problem
to
be
solved.
Herein,
sensing
platform
for
ions
in
water
samples
was
designated
based
on
mixed
transition
metal
oxides.
NiFe
2
O
4
nanoparticles
were
fabricated
using
simple
straightforward
sol–gel
protocol
followed
calcination
at
900°C.
Convenient
physical
characterization
tools
employed
investigate
crystal
structure,
morphological,
chemical
composition,
elemental
mapping
distribution
this
formed
nanocomposite.
The
cubic
spinel
structure
confirmed
XRD
TEM
analyses.
average
crystallite
size
estimated
25.70
nm
wide
particle
range
between
10
50
nm.
Cyclic
voltammetric
study
revealed
pronounced
oxidation
current
density
nanomaterial
when
contrasted
that
Fe
3
1.283
times.
altering
scan
rate
electrolyte
pH
during
relevant
electrochemical
measurements
electroactivity
oxide
nanostructure
evaluated.
Some
kinetic
parameters
reaction
nanocomposite
including
Tafel
slope
(59.96
mV
dec
−1
),
exchange
(2.13
×
−7
A
cm
−2
diffusion
coefficient
(1.178
−3
s
electron
transfer
constant
(2.074
)
values.
linear
towards
with
outstanding
sensitivity
70.57
nA
μM
lowered
detection
limit
23.9
nM
could
monitored
nanopowder.
These
encouraging
results
might
focus
further
efforts
synthesizing
binary
oxides
surprising
activity
numerous
analytes
determination.
Nanocomposite
electrode
materials
based
on
Pt
nanoparticles
(Pt
NPs)
deposited
various
carbonaceous
(Carbon
Black-Vulcan
XC72,
graphene,
and
graphite)
were
fabricated
evaluated
for
ethanol
electrooxidation
reaction
(EOR)
in
acidic
media.
The
promotional
effects
of
calcination
incorporation
metal
oxides
(TiO2,
SnO2,
ZnO,
Fe2NiO4,
Fe2O3,
CuFe2O4,
ZnFe2O4,
5%
Ru
alumina)
into
Vulcan
XC-72
the
performance
NPs
toward
EOR
systematically
evaluated.
(∼20
wt
%)
synthesized
via
a
facile
NaBH4
reduction
method
at
ambient
temperature,
yielding
spherical
with
minimal
agglomeration.
Physicochemical
characterization
(XRD,
TEM,
SEM)
confirmed
uniform
dispersion
reduced
particle
size
calcined
Fe2O3-C
supports.
Electrochemical
analysis
(CV,
CA,
LSV,
EIS)
revealed
that
Pt/5%
exhibited
superior
activity,
low
onset
potential
(0.2
V
vs
Ag/AgCl),
high
current
density
(0.52
mA/cm2),
enhanced
stability
(retaining
>34%
activity
after
3000
s).
Dual
(pre/post-Pt
deposition)
stabilized
ultrasmall
(3.09
nm)
Fe2O3-C,
achieving
2.3
times
higher
mass
than
Pt/C.
improved
is
attributed
to
synergistic
electronic
effects,
optimized
Pt-support
interactions,
Fe2O3-mediated
C-C
bond
cleavage.
This
work
highlights
efficacy
dual
thermal
annealing
(pre-
post-Pt
stabilizing
advancing
DEFC
catalyst
design.
