The
reaction
between
MgH2
and
water
produces
a
significant
amount
of
hydrogen
gas,
which
is
beneficial
for
the
development
energy
in
fuel
cells.
However,
slow
production
rate
formation
dense
Mg(OH)2
layer
limit
its
application.
In
this
study,
was
doped
with
2
wt.%,
4
8
wt.%
RE/C
(RE
=
La,
Ce,
Pr)
catalysts
through
ball
milling
technology,
hydrolysis
experiments
were
conducted.
kinetics
activation
analyzed
using
Avrami-Erofeev
Arrhenius
equations
linear
fitting.
X-ray
diffraction
scanning
electron
microscopy
employed
to
analyze
mechanism
effect
on
particle
surfaces.
Notably,
addition
exhibited
best
improvement
performance
MgH2.
At
high
temperatures,
maximum
rates
MgH2+4La/C,
MgH2+4Ce/C,
MgH2+4Pr/C
are
31.05,
30.92,
29
mL·g−1·s−1,
respectively,
capacities
2145,
2140,
2000
mL·g−1,
energies
21.8,
24.8,
21.3
kJ·mol−1,
respectively.
MgH2+RE/C
composites
studied
overcame
key
issues
hydrolysis,
presenting
promising
strategy
production.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 5, 2025
Hydrogen
production
from
silicon
(Si)
hydrolysis
is
environmentally
friendly,
safe,
portable,
and
promising.
However,
the
self-protected
oxide
layer
around
Si
a
sluggish
rate
impede
its
practical
utilization.
To
address
this
problem,
we
introduced
sodium
hydride
(NaH)
to
form
core–shell
structure
of
NaH/Si
composites
via
straightforward
one-step,
hand-mixing
method
in
an
ambient
environment.
NaH-based
Si-M
exhibit
83%
hydrogen
yield
52.7
mL/min
generation
at
1–0.7
molar
ratios.
The
hydrolytic
activity
includes
breakdown
NaH
continuous
Si.
X-ray
diffraction,
scanning
electron
microscopy,
nanoindentation,
reaction
observation
studies
have
verified
that
pivotal
promoting
thorough
attaining
maximum
achievable
compared
calcium
(CaH2).
showed
excellent
performance
CaH2/Si
with
microstructure
Si-S
≈
1–3
μm,
75
Si-L
75–425
μm.
Our
study
provided
innovative
design
idea
for
utilizing
cost-effective
easily
transportable
materials
applications,
which
has
potential
further
advancement.
