Abstract
Transition
metal
selenides
(TMSe)
are
promising
oxygen
evolution
reaction
(OER)
electrocatalysts
but
act
as
precursors
rather
than
the
actual
active
phase,
transforming
into
amorphous
oxyhydroxides
during
OER.
This
transformation,
along
with
formation
of
selenium
oxyanions
and
unstable
heterointerfaces,
complicates
structure‐activity
relationship
reduces
stability.
work
introduces
novel
“layered‐hierarchical
dual
lattice
strain
engineering”
to
inhibit
surface
reconstruction
Ni
x
Se
by
modulating
both
nickel
foam
(NF)
substrate
Mo
2
N
nanosheets
(NM)
nanorods‐nanosheets
catalytic
layer
(NiSe‐Ni
0.85
Se‐NiO,
NSN)
ultrafast
interfacial
bimetallic
NiFeOOH
coating,
achieving
optimized
NM/NSN/NiFeOOH
configuration.
The
NM
induces
strain,
enhancing
OER
activity
improving
electron
transport
adhesion,
while
coating
additional
mitigating
oxidative
degradation,
reinforcing
structural
integrity.
catalyst
demonstrates
exceptional
performance
low
overpotentials
208
mV@10
mA
cm
−2
outstanding
stability
over
100
h
at
in
alkaline
freshwater
seawater.
Theoretical
analysis
shows
that
effectively
prevents
degradation
preserving
sites
for
optimal
intermediate
interactions
stabilizing
electronic
environment.
provides
a
strategy
TMSe
beyond.
Journal of Colloid and Interface Science,
Год журнала:
2025,
Номер
unknown, С. 137423 - 137423
Опубликована: Март 1, 2025
Molybdenum
carbides
are
promising
alternatives
to
Pt-based
catalysts
for
the
hydrogen
evolution
reaction
(HER)
due
their
similar
d-band
electronic
configuration.
Notably,
MoxC
exhibits
superior
HER
kinetics
in
alkaline
media
compared
acidic
conditions,
contrasting
with
catalysts.
Herein,
we
present
3D
porous
β-Mo2C
nanosheets,
achieving
an
overpotential
of
111
mV
at
10
mA
cm-2
1
M
KOH,
significantly
lower
than
environments.
Simulations
on
pristine
Mo2C
surface
reveal
that
water
dissociation
poses
a
higher
energy
barrier
media,
suggesting
crystal
structure
alone
does
not
dictate
kinetics.
Operando
attenuated
total
reflection
surface-enhanced
infrared
absorption
spectroscopy
shows
activates
interfacial
water,
generating
liquid-like
and
free
facilitates
hydroxyl
species
adsorption,
reducing
activation
below
38.43
±
0.19
kJ/mol.
Our
findings
self-activation
effect
offer
insights
into
mechanism
Mo-based
electrocatalysts
guide
design
highly
active
Abstract
Electrochemical
water
splitting
is
a
promising
approach
for
sustainable
hydrogen
production,
but
the
oxygen
evolution
reaction
(OER)
remains
bottleneck
due
to
sluggish
kinetics,
poor
activity,
and
limited
stability
scalability.
Here,
Mo
2
N‐functionalized
nickel
designed
foam
(NF@Mo
N)
subsequently
transform
into
N/NiSe/Ni
P
multi‐phase
heterostructure
through
selenization
phosphorization,
address
these
challenges.
The
optimized
NF@Mo
catalyst
integrates
three
key
strategies:
(I)
functionalizing
NF
with
N
enhance
conductivity
charge
transfer,
(II)
engineering
collaborative
multi‐interface
optimize
active
sites
(III)
precisely
controlling
phase
formation
phosphorization
mitigate
surface
reconstruction
ensure
long‐term
stability.
not
only
achieves
an
overpotential
of
242
mV@10
mA
cm
−2
remarkable
over
350
h,
also
low
395
mV
at
high
current
density
800
,
outperforming
pristine
other
control
samples.
Theoretical
analysis
reveals
that
N‐stabilized
NiSe/Ni
on
enhances
optimizes
adsorption
energies
OER
intermediates,
leading
improved
catalytic
performance
This
work
provides
new
strategy
designing
high‐performance,
non‐precious
metal
catalysts
industrial
applications
advancing
production.
Simultaneous
dual-cation
doping
of
V
and
Fe
is
employed
to
optimize
Co-based
nanowires
results
in
enhanced
catalytic
activity
due
modulated
electronic
structure
stabilized
reaction
intermediates
over
the
undoped
or
single-doped
catalysts.
