ChemSusChem,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 30, 2024
Abstract
As
the
global
energy
structure
evolves
and
clean
technologies
advance,
electrocatalysis
has
become
a
focal
point
as
critical
conversion
pathway
in
new
sector.
Transitional
metal
electrocatalysts
(TMEs)
with
their
distinctive
electronic
structures
redox
properties
show
great
potential
electrocatalytic
reactions.
However,
complex
reaction
mechanisms
kinetic
limitations
hinder
improvement
of
efficiency,
highlighting
necessity
for
comprehensive
studies
on
performance
electrocatalysts.
X‐ray
Absorption
Fine
Structure
(XAFS)
spectra
stand
out
robust
tool
examining
electrocatalyst′s
due
to
its
atomic
selectivity
sensitivity
local
environments.
This
review
delves
into
application
XAFS
technology
characterizing
TMEs,
providing
in‐depth
analyses
Near‐Edge
(XANES)
spectra,
Extended
(EXAFS)
both
R‐space
k
‐space.
These
reveal
intrinsic
structural
information,
interactions,
catalyst
stability,
aggregation
morphology.
Furthermore,
paper
examines
advancements
in‐situ
techniques
real‐time
monitoring
active
site
changes,
capturing
intermediate
transitional
states,
elucidating
evolution
species
during
insights
deepen
our
understanding
structure‐activity
relationship
offer
valuable
guidance
designing
developing
highly
stable
Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
38(21), P. 21397 - 21411
Published: Oct. 23, 2024
Ordered
structural
modifications
of
the
gas
diffusion
layer
(GDL)
are
crucial
for
enhancing
performance
proton
exchange
membrane
(PEM)
fuel
cells.
In
this
work,
a
three-dimensional,
two-phase
numerical
model
PEM
cells
with
grooves
added
is
constructed.
The
size,
position,
and
direction
examined.
essential
relationship
between
cell
revealed.
mechanisms
oxygen
transport
water
drainage
elucidated
based
on
Sherwood
(Sh)
number
capillary
pressure
gradient
(∇PC),
respectively.
findings
suggest
that
under-rib
longitudinal
offer
lower
than
under-channel
due
to
on-way
resistance.
Furthermore,
smaller
size
grooves,
higher
performance.
underlying
reason
groove
demonstrates
an
increased
Shaverage
enhanced
∇PC,average,
while
transverse
exhibits
reduced
progressively
smooth
∇PC,local,
On
basis,
comparison
performed.
current
density
by
0.89%
1.10%,
Longitudinal
recommended
in
industrial
practice
owing
more
favorable
∇PC,average
relative
ease
fabrication.
Finally,
superior
effects
explored
via
applications
GDLs
various
properties.
Taking
capability
into
account,
suitable
addition
porosity.
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 10, 2024
Improvement
in
the
durable
and
active
low-Pt
nanocatalysts
for
oxygen
reduction
reaction
(ORR)
is
essential
target
clean
energy.
Herein,
an
efficient
CeO
Small Methods,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 16, 2024
Abstract
Ultrafine
Pt‐based
alloy
nanoparticles
supported
on
carbon
substrates
have
attracted
significant
attention
due
to
their
catalytic
potential.
Nevertheless,
ensuring
the
stability
of
these
remains
a
critical
challenge,
impeding
broad
application.
In
this
work,
novel
nanodot
arrays
(NAs)
are
introduced
where
superfine
uniformly
implanted
in
2D
substrate
and
securely
anchored.
Electrochemical
testing
PtCo
NAs
demonstrates
exceptional
methanol
oxidation
reaction
(MOR)
activity,
achieving
1.25
A
mg
−1
.
Moreover,
exhibit
outstanding
throughout
period,
underscoring
effectiveness
anchoring
mechanism.
Comprehensive
characterization
theoretical
calculations
reveal
that
carbon‐anchored
structure
optimizes
electronic
coordination
environment
Pt,
restricts
nanoparticle
migration,
suppresses
transition
metal
dissolution.
This
strategy
represents
major
advancement
addressing
limitations
ultrafine
applications
offers
broader
insights
into
design
next‐generation
catalysts
with
enhanced
durability
performance.
ChemSusChem,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 30, 2024
Abstract
As
the
global
energy
structure
evolves
and
clean
technologies
advance,
electrocatalysis
has
become
a
focal
point
as
critical
conversion
pathway
in
new
sector.
Transitional
metal
electrocatalysts
(TMEs)
with
their
distinctive
electronic
structures
redox
properties
show
great
potential
electrocatalytic
reactions.
However,
complex
reaction
mechanisms
kinetic
limitations
hinder
improvement
of
efficiency,
highlighting
necessity
for
comprehensive
studies
on
performance
electrocatalysts.
X‐ray
Absorption
Fine
Structure
(XAFS)
spectra
stand
out
robust
tool
examining
electrocatalyst′s
due
to
its
atomic
selectivity
sensitivity
local
environments.
This
review
delves
into
application
XAFS
technology
characterizing
TMEs,
providing
in‐depth
analyses
Near‐Edge
(XANES)
spectra,
Extended
(EXAFS)
both
R‐space
k
‐space.
These
reveal
intrinsic
structural
information,
interactions,
catalyst
stability,
aggregation
morphology.
Furthermore,
paper
examines
advancements
in‐situ
techniques
real‐time
monitoring
active
site
changes,
capturing
intermediate
transitional
states,
elucidating
evolution
species
during
insights
deepen
our
understanding
structure‐activity
relationship
offer
valuable
guidance
designing
developing
highly
stable
