ACS Applied Nano Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 20, 2024
Owing
to
the
limited
supply
and
high
cost,
rational
design
of
precious
metal-based
catalysts
is
essential
importance
for
boosting
electrocatalytic
activity.
Herein,
variation
Au
species
from
single-atoms
ultrasmall
nanoparticles
(3–6
nm)
deposited
on
NiFe-layered
double
hydroxide
(NiFe-LDH)
was
investigated
as
a
bifunctional
electrocatalyst
oxygen
hydrogen
evolution
reactions.
The
brucite-like
layered
structure
NiFe-LDH
verified
by
X-ray
diffraction.
existence
single-atom
well
local
bonding
environment
were
evaluated
high-resolution
transmission
electron
microscopy
photoelectron
spectroscopy.
integration
into
single
atoms
metallic
shows
significant
improvement
in
activity
1
M
KOH.
Single-atom
Au/NiFe-LDH
(2Au/NiFe-LDH,
0.21
wt
%
Au)
delivers
lowest
overpotential
209
mV
catalyze
10
mA
cm–2
OER
current
density
with
Tafel
slope
46.5
dec–1.
On
other
hand,
nanoparticles/NiFe-LDH
(50Au/NiFe-LDH,
3.22
possesses
an
150
at
HER
134.5
For
overall
water
splitting,
under
optimum
conditions,
2Au/NiFe-LDH//50Au/NiFe-LDH
couple
requires
cell
potentials
1.62
1.78
V
deliver
100
These
findings
provide
insights
effect
decoration
catalyst
surface
efficient
performance
production
O2
H2
alkaline
electrolyte.
Herein,
a
core/shell
LNSP
(lamellar
nanosheet–nanoplate)
of
nickel
oxy
carbide
(Ni–O–C/LNSP)
has
been
synthesized
by
solvent-devoid
combustion
process,
which
exhibits
exceptional
oxygen
evolution
efficiency
(OER)
performance
with
an
overpotential
311
mV,
Tafel
slope
116
mV
dec–1,
and
stability
over
8
h
2.8%
potential
loss
owing
to
more
exposed
active
sites
high
conductivity
the
interface
effect.
The
activation
energy
28
kJ/mol
was
calculated
for
electrolysis
using
Ni–O–C/LNSP.
integrated
area
3.70
×
10–5
AV
established
MOOH*
formation
4.619
10–16.
ultrastability
Ni–O–C/LNSP
commercial
application
shown
durability
at
10/100
mA
cm–2
OER
(GC─8
h,
2.8%;
NF─100
3.4/4.9%),
UOR
(60
3.4%),
SWO
4.1%),
MSWO
5.6%),
overall
water
splitting
(100
3.9%).
effect
pH
addition
tetramethylammonium
cations
(TMA+)
reveals
follows
lattice
mechanism.
solar-driven
1.58
V
shows
effectiveness
STH
conversion.
multiple
applications
projected
as
auspicious
catalyst
applications.
Using
Ni–O–C/LNSP,
we
have
generated
H2
effectively
lower
power
consumption
771.08
LH2
kW
h–1
than
bare
NiO
(801
h–1).
as-prepared
used
nonenzymatic
lactate
detection
showed
sensitivity
71.05
μA
mM–1
1.54
[lactate]
difference
in
human
sweat
corroborated
under
both
anaerobic
aerobic
exercise
conditions
Inorganic Chemistry Frontiers,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Pt-loaded
CeO
2
cubes
were
designed
via
a
rapid
and
eco-friendly
ultrafast
microwave
quasi-solid-state
approach
within
60
s,
which
exhibited
low
overpotential
of
10
mV
to
reach
mA
cm
−2
in
0.5
M
H
SO
4
with
excellent
long-term
stability.
Materials,
Год журнала:
2025,
Номер
18(9), С. 2101 - 2101
Опубликована: Май 3, 2025
Modulating
the
oxidation
states
of
transition
metal
species
is
a
practical
approach
to
enhance
redox
activity
and
increase
number
active
sites
in
electrode
materials.
Herein,
we
describe
simple
one-step
hydrothermal
prepare
CoxSy
with
two
different
phases,
cobalt
pyrite
(CoS2)
pentlandite
(Co9S8),
explain
influence
material
microstructure
properties
on
electrochemical
performance.
The
as-prepared
CoS2
Co9S8
were
investigated
as
symmetric
supercapacitor
(SC)
devices
for
potential
energy
storage
applications.
exhibited
highest
specific
gravimetric
capacitance
14.12
Fg−1
at
0.2
mAcm−2
retention
91.3%
after
10,000
cycles,
indicating
robust
cycling
stability.
In
addition,
SC
device
showed
(E)
power
(P)
density
9.14
Whkg−1
0.23
kWkg−1.
These
results
highlight
tailoring
phase
syntheses
structure
toward
high-performance
conversion.
The
rational
design
of
robust
electrocatalysts
in
view
exceptional
stability
with
fast
kinetics
toward
the
oxygen
evolution
reaction
(OER)
using
a
sustainable
synthetic
strategy
is
still
underway.
A
simple
wet
chemical
method
established
to
report
Ag-
and
Co-based
oxalate
(Ag@CoC2O4)
for
catalyzing
OER,
which
demands
291/241
mV
(GC/NF)
reach
10
mA/cmgeo2,
reduction
50
compared
CoC2O4
Tafel
slope
68/60
dec-1,
chronopotentiometry
12/100
h,
Faradaic
efficiency
98%.
silverization
improved
charge
transport
by
reducing
resistance
increase
Cdl
from
1.02
mF
cm-2,
indicating
abundant
accessible
catalytic
sites.
Further,
was
manifested
calculating
intrinsic
geometric
activities.
mechanistic
route
analyzed
proton
order
(ρRHE),
suggesting
proton-decoupled
electron
transfer
(PDET)
process.
kinetic
study
via
operando
EIS
Ag@CoC2O4
reveals
enhanced
OER
kinetics,
less
resistance,
more
conductivity,
faster
kinetics.
activity
strengthened
Bode
at
various
potentials.
temperature-dependent
analysis
inferred
that
decreased
activation
energy
(5.39
kJ/mol)
related
(16.32
kJ/mol).
Besides,
alkaline
electrolyzers
solar
cell-driven
built
anode
achieve
total
water
splitting
(1.59
V
@
mA/cmgeo2),
establishing
suitability
practical
applications.
alternative
process
used
produce
zero-carbon
green
H2
further
value-added
electrocatalysis,
thereby
showing
economic
benefits
oxidation
exposing
surface
bulk
active
centers
rapid
electrolyte
diffusion.
