Abstract
This
work
highlights
the
novelty
of
investigating
hydrogen
production
from
hydrazine
borane
(HB)
using
copper
(Cu).
first‐row
transition
metal
is
abundant
yet
underexplored
as
a
catalyst
compared
to
precious
metals.
We
focus
on
The
synthesis
Cu
nanoparticles
supported
MIL‐53(Al)
(Cu/MIL‐53(Al))
through
an
impregnation‐reduction
method
and
evaluate
their
performance
in
HB
hydrolysis.
Advanced
characterization
techniques,
including
X‐ray
diffraction
(XRD),
photoelectron
spectroscopy
(XPS),
transmission
electron
microscopy
(TEM),
TEM‐energy‐dispersive
(TEM‐EDX),
reveal
average
nanoparticle
size
3.94
±
0.32
nm.
Notably,
turnover
frequency
(TOF)
for
with
Cu/MIL‐53(Al)
at
298
K
was
966
h⁻¹
(16.1
min⁻¹),
representing
highest
TOF
reported
Cu‐based
systems
Furthermore,
we
calculated
activation
energy
(Ea
#
),
enthalpy
(ΔH
entropy
(ΔS
)
83.77
kJ
mol⁻¹,
81.15
48.56
J
mol⁻¹
K⁻¹,
respectively,
Arrhenius
Eyring‐Polanyi
equations.
These
findings
underscore
potential
efficient
cost‐effective
production,
significantly
advancing
sustainable
technologies.
ACS Applied Nano Materials,
Год журнала:
2024,
Номер
7(11), С. 12701 - 12710
Опубликована: Май 30, 2024
Nanocoral
arrays
of
Co(OH)F@NiCo-LDH/Co9S8
have
been
successfully
synthesized
onto
nickel
foam
via
a
solvothermal
method.
The
prepared
heterostructured
nanocage
demonstrates
outstanding
electrochemical
properties
such
as
excellent
specific
capacitance
(3409
mC
cm–2
at
1
mA
cm–2)
and
superior
capacity
retention
(96.38%
after
7000
charge–discharge
cycles
10
cm–2).
asymmetrical
supercapacitor
fabricated
by
reduced
graphene
oxide
showed
an
energy
density
37.2
W
h
kg–1
power
800
storage
(87.63%
5000
charge–discharge).
This
suggests
that
the
composite
has
performance
for
applications.
unique
combination
materials
structural
design
strategy
employed
highlight
significant
advancements
to
develop
high-performance
supercapacitors,
positioning
this
study
cutting
edge
nanomaterials
research
in
Nanomaterials,
Год журнала:
2024,
Номер
14(4), С. 333 - 333
Опубликована: Фев. 8, 2024
This
study
aims
to
prepare
new
nanocomposites
consisting
of
Cr2O3/CaCO3
as
a
catalyst
for
improved
hydrogen
production
from
NaBH4
methanolysis.
The
nanocomposite
possesses
nanoparticles
with
the
compositional
formula
Cr2−xCaxO3
(x
=
0,
0.3,
and
0.6).
These
samples
were
prepared
using
sol-gel
method,
which
comprises
gelatin
fuel.
structure
composites
was
studied
X-ray
diffraction
(XRD),
Fourier
transform
infrared
spectroscopy
(FTIR),
Raman
spectroscopy,
environmental
scanning
electron
microscopy
(ESEM),
(XPS).
XRD
data
showed
rhombohedral
crystallinity
samples,
average
crystal
size
25
nm.
FTIR
measurements
represented
absorption
bands
Cr2O3
CaO.
ESEM
micrographs
spherical
shape
nanoparticles.
XPS
proved
desired
oxidation
states
optical
band
gap
is
3.0
eV,
calcium
doping
causes
reduction
2.5
1.3
eV
at
15.0
30.0%
ratios.
methanolysis
involved
accelerated
H2
when
catalyst.
Furthermore,
Cr1.7Ca0.3O3
had
highest
generation
rate,
value
12,750
mL/g/min.
