First-principles calculations to investigate Mg3XH8 (X = Ca, Sc, Ti, V, Cr, Mn) materials for hydrogen storage
International Journal of Hydrogen Energy,
Год журнала:
2024,
Номер
74, С. 372 - 383
Опубликована: Июнь 14, 2024
Язык: Английский
Atomically Modulating Metal‐Support Interactions by Isolated Co‐N4 Sites for Efficient Hydrogen Oxidation Catalysis
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 24, 2025
Abstract
Supported
metal
electrocatalysts
with
appropriate
metal‐support
interactions
(MSIs)
show
great
potential
for
heterogeneous
catalysis,
however,
precisely
tuning
the
at
an
atomic
level
remains
a
significant
challenge.
In
this
work,
single‐atom
Co‐N
4
sites
are
introduced
to
tailor
interfaces
between
PtIr
alloy
clusters
and
carbonaceous
substrates,
thereby
establishing
highly
active
stable
catalysts
toward
hydrogen
oxidation
reaction
(HOR)
in
alkaline
electrolytes
realizing
atomically
MSIs
modulation.
The
experimental
theoretical
results
unveil
that
formation
of
robust
incorporation
Co
single
atoms
is
evidenced
by
increased
coordination
number
Pt‐N/C,
which
effectively
optimizes
adsorption
behaviors
H
ad
on
Pt/Ir
also
tightly
immobilizes
supports.
isolated
greatly
reduces
energy
barrier
rate‐determining
Volmer
step,
accelerating
HOR
kinetics
electrolytes.
Consequently,
optimal
PtIr‐Co
0.05
NC
exhibit
exceptional
activity
exchange
current
density
up
13.1
mA
cm
−2
28.8
50
mV
0.1
m
KOH.
Furthermore,
electrocatalyst
delivers
negligible
degradation
due
confinement
effect
Co‐functionalized
carbon
supports
clusters.
Язык: Английский
Intrinsic Activity: A Critical Challenge of Alkaline Hydrogen Oxidation Reaction
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 16, 2024
Abstract
Anion
exchange
membrane
fuel
cells
(AEMFCs)
are
advantageous
for
reducing
or
even
eliminating
the
dependency
on
platinum
resources,
as
alkaline
environment
allows
use
of
non‐precious
metal
catalysts
oxygen
reduction
reaction
at
cathode.
However,
intrinsic
activity
hydrogen
oxidation
(HOR)
in
environments
is
2
to
4
orders
magnitude
lower
than
acidic
environments,
which
becomes
major
challenge
AEMFCs.
This
review
examines
current
developments
HOR
and
systematically
summarizes
activation
mechanism
with
a
focus
potential
influencing
factors
enhancement
strategies.
Furthermore,
it
offers
insights
into
prospects
developing
more
efficient
catalysts.
Язык: Английский
Charge Transfer at the Interface of Iridium and Atomically Dispersed Mn–O Clusters Induced Full-Potential Hydrogen Oxidation
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 2, 2025
Hydrogen
has
long
been
an
important
energy
source
for
sustainable
development,
and
platinum
group
metals
(PGMs)
are
the
prominent
anode
catalysts
anion
exchange
membrane
fuel
cells
(AEMFCs).
However,
among
PGM
used
in
alkaline
hydrogen
oxidation
reaction
(HOR)
AEMFC
anode,
activity
of
iridium
decreases
sharply
when
potential
exceeds
0.2
V
vs
reversible
electrode
(RHE)
due
to
reduction
adsorption
(Had),
which
is
caused
by
overadsorption
OH.
Herein,
we
prepared
Ir
nanoparticles
with
atomically
dispersed
Mn-O
clusters
on
their
surface
(Ir/Mn0.40OC),
difference
work
function
drives
charge
transfer
from
at
full
HOR
(∼0-1.2
RHE),
could
upshift
its
d-band
center
enhance
Had.
This
strategy
realized
5
h
durability
test
only
lost
about
10.9%
current
density
0.71
RHE.
Moreover,
this
catalyst
be
mass-normalized
reaches
8.26
W
mgIr-1.
Язык: Английский
Multiple Functional Engineering Strategies and Active Site Identification in Ru‐Based Electrocatalysts for Catalytic Conversion Reactions
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 3, 2025
Electrochemical
conversion
has
been
regarded
as
an
ideal
technology
for
achieving
clean
and
sustainable
energy,
showing
significant
promise
in
addressing
the
increasingly
serious
energy
crisis
environmental
pollution.
Ru-containing
electrocatalysts
(RUCE)
outperform
other
precious
metals
due
to
elevated
intrinsic
activity
superior
cost-effectiveness,
developing
into
a
promising
candidate
electrochemical
reactions.
A
challenge
field
of
catalyst
discovery
lies
its
heavy
reliance
on
empirical
methods,
rather
than
approaches
that
are
rooted
rational
design
principles.
This
review
first
concentrates
catalytically
active
sites
critical
factors
governing
catalytic
performance
durability.
Then,
comprehensive
summary
multifunctional
modification
strategies
ranging
from
nanoscale
atomic
scale
is
explored
control
structure
improve
performance.
By
unveiling
roles
each
component
modified
RUCE
at
level,
their
identified
discussed
establish
structure-performance
relationship
catalysts.
Finally,
challenges
perspectives
Ru-based
materials
hydrogen,
oxygen,
nitrogen
reactions
presented
inspire
further
efforts
toward
understanding
meet
ever-growing
demand
future.
Язык: Английский
High‐Entropy Alloy Nanowires for Efficient and Durable Hydrogen Oxidation Reaction
Advanced Sustainable Systems,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 24, 2025
Abstract
High‐entropy
alloy
nanowires
(HEA
NWs)
hold
significant
promise
for
achieving
exceptional
catalytic
activity
and
stability,
owing
to
their
unique
1D
morphology
the
electronic
engineering
potential
of
HEAs.
However,
controlled
synthesis
HEA
NWs
remains
a
challenge.
In
this
work,
novel
wet‐chemical
approach
is
reported
ultrathin
NWs,
represented
by
PtRuNiCuPb,
through
an
active‐hydrogen
(H·)‐mediated
reduction
mechanism.
The
H·
species,
generated
organic
dehydrogenation,
facilitate
effective
co‐reduction
metal
salts
with
differing
potentials,
while
mild
conditions
ensure
control
toward
nanowire
formation.
resulting
PtRuNiCuPb
exhibit
remarkable
in
electrocatalytic
hydrogen
oxidation
reaction
(HOR)
alkaline
media,
due
multimetallic
compositions
abundant
grain
boundaries.
At
50
mV,
specific
mass
activities
reach
8.46
mA
cm
−2
5.54
A
mg
Pt+Ru
−1
,
respectively,
≈11.3
14.5
times
greater
than
those
commercial
Pt/C.
Thanks
morphology,
demonstrate
excellent
retaining
97%
initial
after
20000
cycles
accelerated
durability
testing.
These
findings
offer
promising
strategy
designing
highly
efficient
durable
catalysts
using
morphologies
applications.
Язык: Английский
Polypyrrole-decorated Vulcan XC-72R support enables a low platinum content PtRu catalyst toward alkaline hydrogen oxidation reaction
Journal of Colloid and Interface Science,
Год журнала:
2025,
Номер
697, С. 137908 - 137908
Опубликована: Май 16, 2025
Язык: Английский
Revealing the heterogeneous catalytic kinetics of PtRu nanocatalysts at single particle level
The Analyst,
Год журнала:
2024,
Номер
unknown
Опубликована: Янв. 1, 2024
Comparison
of
the
structural
features
and
catalytic
performance
bimetallic
nanocatalysts
will
help
to
develop
a
unified
understanding
structure-reaction
relationships.
The
single-molecule
fluorescence
technique
was
utilized
reveal
differences
in
kinetics
among
PtRu
Pt
Ru
monometallic
at
single
particle
level.
results
show
that
have
higher
apparent
rate
constants
desorption
relative
nanocatalysts,
which
leads
their
activity.
At
level,
wider
distribution
constants,
suggesting
activity
heterogeneity
nanocatalysts.
By
investigating
relationship
between
reaction
dynamic
fluctuations,
it
found
spontaneous
surface
restructuring
reaction-induced
nanoparticles
occurred.
restructured
faster,
made
more
active.
These
findings
provide
new
insights
into
design
highly
active
Язык: Английский