Angewandte Chemie,
Год журнала:
2024,
Номер
136(39)
Опубликована: Июль 2, 2024
Abstract
Developing
non‐platinum
group
metal
catalysts
for
the
sluggish
hydrogen
oxidation
reaction
(HOR)
is
critical
alkaline
fuel
cells.
To
date,
Ni‐based
materials
are
most
promising
candidates
but
still
suffer
from
insufficient
performance.
Herein,
we
report
an
unconventional
hcp/fcc
Ni
(u‐
Ni)
heteronanocrystal
with
multiple
epitaxial
heterointerfaces
and
coherent
twin
boundaries,
generating
rugged
surfaces
plenty
of
asymmetric
convex
sites.
Systematic
analyses
discover
that
such
sites
enable
adsorption
*H
in
unusual
bridge
positions
weakened
binding
energy,
circumventing
over‐strong
on
traditional
hollow
positions,
simultaneously
stabilizing
interfacial
2
O.
It
thus
synergistically
optimizes
HOR
thermodynamic
process
as
well
reduces
kinetic
barrier
rate‐determining
Volmer
step.
Consequently,
developed
u‐
exhibits
top‐rank
activity
a
mass
40.6
mA
mg
−1
(6.3
times
higher
than
fcc
control)
together
superior
stability
high
CO‐tolerance.
These
results
provide
paradigm
designing
high‐performance
by
shifting
state
intermediates
through
configuring
surface
Advanced Materials,
Год журнала:
2024,
Номер
36(33)
Опубликована: Июнь 13, 2024
Producing
green
hydrogen
in
a
cost-competitive
manner
via
water
electrolysis
will
make
the
long-held
dream
of
economy
reality.
Although
platinum
(Pt)-based
catalysts
show
good
performance
toward
evolution
reaction
(HER),
high
cost
and
scarce
abundance
challenge
their
economic
viability
sustainability.
Here,
non-Pt,
high-performance
electrocatalyst
for
HER
achieved
by
engineering
fractions
stacking
fault
(SF)
defects
MoNi
Advanced Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 17, 2025
Efficient
water
splitting
for
renewable
hydrogen
production
requires
the
development
of
highly
active
and
stable
electrocatalysts.
This
study
investigates
design
synthesis
defect-engineered
multimetallic
heterostructures
as
advanced
electrocatalysts
overall
splitting.
A
synergistic
approach
combining
atomic-scale
defect
engineering
multiphase
is
employed
to
enhance
catalytic
activity.
series
porous
intermetallic
alloys
(CoCuMoNi)
with
abundant
sites
are
synthesized
using
a
high-temperature
alloying-dealloying
technique.
Due
effect
interfaces,
built-in
electric
fields,
engineering,
CoCuMoNi
catalyst
exhibits
excellent
bifunctional
activity
(Hydrogen
evolution
reaction:
14
mV@10
mA
cm-2;
Oxygen
reaction
(OER):
211
Overall
splitting:
1.559
V@100
cm-2),
significantly
enhanced
compared
pure
metals
conventional
materials.
Additionally,
these
structures
demonstrate
stability
durability.
Advanced
characterization
techniques
density
functional
theory
(DFT)
reveal
that
formation
heterojunctions
not
only
induces
electronic
modulation
but
also
enhances
interactions
charge
transfer
from
Ni
Mo
Cu
Co,
facilitating
intermediate
transformation,
thereby
boosting
intrinsic
work
highlights
potential
scalable
efficient
electrocatalytic
platforms,
paving
way
their
practical
applications
in
clean
energy
technologies.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 2, 2024
Developing
non-platinum
group
metal
catalysts
for
the
sluggish
hydrogen
oxidation
reaction
(HOR)
is
critical
alkaline
fuel
cells.
To
date,
Ni-based
materials
are
most
promising
candidates
but
still
suffer
from
insufficient
performance.
Herein,
we
report
an
unconventional
hcp/fcc
Ni
(u-hcp/fcc
Ni)
heteronanocrystal
with
multiple
epitaxial
heterointerfaces
and
coherent
twin
boundaries,
generating
rugged
surfaces
plenty
of
asymmetric
convex
sites.
Systematic
analyses
discover
that
such
sites
enable
adsorption
*H
in
unusual
bridge
positions
weakened
binding
energy,
circumventing
over-strong
on
traditional
hollow
positions,
simultaneously
stabilizing
interfacial
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 3, 2024
Abstract
Membrane‐based
gas
separation
offers
notable
energy
efficiency
benefits
for
hydrogen
purification,
yet
it
is
often
hindered
by
the
inherent
trade‐off
between
permeability
and
selectivity.
To
address
this
challenge,
a
novel
mixed
matrix
membrane
(MMM)
design
presented
to
boost
H
2
performance
via
continuous
spillover
mechanisms
first
time.
The
MMM
incorporates
palladium‐functionalized
ZIF‐67
gel
(Pd@ZIF‐67
gel)
network
into
polymer
of
intrinsic
microporosity
(PIM‐1)
matrix.
serves
as
uniform
dispersion
medium
palladium
nanoparticles
(Pd
NPs),
thereby
generating
multitude
active
sites.
These
exposed
sites,
in
conjunction
with
microporous
structure
ZIF‐67,
facilitate
dissociation
establish
pathway
throughout
membrane.
This
synergistic
leads
substantial
improvements
both
transport
At
an
optimal
loading
28
wt%
Pd@ZIF‐67
gel,
MMMs
exhibit
3620
Barrer
remarkable
417%
enhancement
/CH
4
selectivity
(24.9),
surpassing
2008
upper
bound.
approach
paves
way
development
advanced
materials
tailored
applications.
