Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 19, 2024
Abstract
Electrocatalytic
water
splitting
is
an
attractive
approach
for
large‐scale
hydrogen
generation,
critical
global
carbon
neutrality.
However,
the
prevalent
commercialized
alkaline
electrolysis
generally
conducted
at
low
current
densities
due
to
sluggish
kinetics
and
high
overpotential,
severely
hampering
high‐efficiency
production.
Exploration
of
evolution
reaction
(HER)
electrocatalysts
that
can
reliably
operate
ampere‐level
under
overpotentials
thus
a
primary
challenge.
In
contrast
extensive
studies
using
powdery
electrocatalysts,
self‐supported
metallic
catalytic
cathode
has
become
burgeoning
direction
toward
densities,
owing
their
integrated
design
with
intensive
interfacial
binding,
conductivity
mechanical
stability
industrial
tolerance/adaption.
Recent
years
have
witnessed
tremendous
research
advances
in
designing
electrocatalysts.
Therefore,
this
flourishing
area
specially
summarized.
Beginning
introduction
theory
mechanism
HER,
engineering
strategies
on
electrodes
are
systematically
summarized,
including
metal
alloy
construction,
heterostructure
engineering,
doping
manipulation,
surface
design.
Meanwhile,
particular
emphasis
focused
relationship
between
structure,
activity,
HER.
Finally,
existing
challenges,
requirements
industrial‐scale
application,
future
aiming
provide
better
solution
electrolysis.
Journal of Colloid and Interface Science,
Год журнала:
2024,
Номер
678, С. 666 - 675
Опубликована: Авг. 29, 2024
In
the
ongoing
quest
for
cost-effective
and
durable
electrocatalysts
hydrogen
production-a
critical
element
of
sustainable
energy
transformation-the
1T
phase
Molybdenum
Disulfide
(MoS
Catalysts,
Год журнала:
2025,
Номер
15(3), С. 278 - 278
Опубликована: Март 16, 2025
Developing
cost-effective
and
high-performance
non-precious
metal-based
electrocatalysts
for
hydrogen
evolution
reaction
is
of
crucial
importance
toward
sustainable
energy
systems.
Herein,
we
prepare
a
novel
hybrid
electrode
featuring
intermetallic
Fe2Mo
nanoparticles
anchored
on
the
hierarchical
nanoporous
copper
skeleton
as
robust
electrocatalyst
by
simple
scalable
alloying
dealloying
methods.
By
virtue
highly
active
unique
bicontinuous
facilitating
ion/molecule
transportation,
Fe2Mo/Cu
shows
excellent
electrocatalysis,
with
low
Tafel
slope
(~71
mV
dec−1)
to
realize
ampere-level
current
density
1
A
cm−2
at
overpotential
~200
in
M
KOH
electrolyte.
Furthermore,
exhibits
long−term
stability
exceeding
400
h
maintain
~250
mA
an
150
mV.
Such
outstanding
electrocatalytic
performance
enables
be
attractive
catalyst
water
splitting
economy.
Constructing
well-defined
multisites
with
high
activity
and
durability
is
crucial
for
the
development
of
highly
efficient
electrocatalysts
toward
multiple-intermediate
reactions.
Here
we
report
negative
mixing
enthalpy
caused
intermetallic
cobalt-titanium
(Co3Ti)
nanoprecipitates
on
a
lamellar
hierarchical
nanoporous
cobalt
skeleton
as
high-performance
nonprecious
multisite
electrocatalyst
an
alkaline
hydrogen
evolution
reaction.
The
Co3Ti
robust
substantially
boosts
reaction
kinetics
water
dissociation
adsorption/combination
by
unisonous
adsorptions
hydroxyl
intermediates
proper
binding
energies.
By
virtue
bicontinuous
that
enables
sufficiently
accessible
facilitates
electron
transfer
ion/molecule
transportation,
self-supported
heterogeneous
electrode
exhibits
extraordinary
electrocatalytic
in
1
M
KOH.
It
reaches
current
density
∼3.31
A
cm–2
at
low
overpotential
200
mV
maintains
exceptional
stability
∼1.33
>1000
h.
Abstract
Earth‐abundant
transition
metal‐based
catalysts
with
exceptional
bifunctionality
for
both
hydrogen
evolution
reaction
(HER)
and
oxygen
(OER)
are
greatly
desired.
Alloyed
catalysts,
such
as
molybdenum‐nickel
(MoNi),
known
to
demonstrate
enhanced
HER
activity,
yet
suffer
from
low
OER
performance.
To
realize
improved
functionality,
elemental
doping
can
be
an
effective
approach,
giving
rise
synergistic
interactions
between
incorporated
metal
species,
optimizing
surface
adsorption
of
target
intermediates,
promoting
reaction.
Herein,
the
performance
MoNi
catalyst
while
simultaneously
boosting
activity
via
incorporating
a
small
amount
iron
chromium
into
(Mo‐Ni(FeCr))
is
demonstrated.
For
optimized
Mo‐Ni(FeCr)
catalyst,
in
1.0
m
potassium
hydroxide
electrolyte,
overpotential
only
11
179
mV
OER,
respectively,
required
afford
current
density
10
mA
cm
−2
.
overall
water
splitting,
20
reached
at
1.489
V.
The
DFT
calculations
demonstrated
that
inclusion
Fe
Cr
reduced
limiting
potentials
HER,
unlocking
efficient
splitting.
These
findings
signify
electrocatalytic
of,
amongst
most
active
bifunctional
electrocatalysts.
Abstract
Alkaline
water
splitting
has
shown
great
potential
for
industrial‐scale
hydrogen
production.
However,
its
broad
application
is
constrained
by
evolution
reaction
(HER)
electrocatalysts,
which
struggle
to
achieve
optimal
current
density
at
low
overpotential.
The
utilization
of
the
spillover
effect
augment
performance
HER
represents
a
burgeoning
area
research.
Although
previous
studies
mainly
focused
on
in
acidic
media,
latest
have
that
also
exists
under
alkaline
conditions,
and
role
improving
cannot
be
ignored.
This
review
examines
mechanisms
elucidating
distinctive
behavior
these
environments
influence
catalytic
processes.
At
same
time
characterization
methods
are
systematically
summarized,
technologies
understanding
control
release
process
provides
strong
support.
Finally,
recent
electrocatalysts
enhance
comprehensively
sorted
out
summarized.
not
only
demonstrate
practical
value
but
provide
new
directions
future
design
optimization
electrocatalysts.
