The Journal of Chemical Physics,
Journal Year:
2024,
Volume and Issue:
161(12)
Published: Sept. 28, 2024
The
microstructure
plays
a
crucial
role
in
the
manufacturing
and
application
of
polyacrylonitrile
fibers,
which
serve
as
precursors
for
carbon
fibers.
Synchrotron
radiation
small
angle
x-ray
scattering
(SR-SAXS)
is
non-destructive
precise
technique
analyzing
fiber
structures.
This
study
employed
one-dimensional
SR-SAXS
mapping
to
extract
key
structural
parameters
such
periodicity,
lamellae
thickness,
extent
amorphous
regions,
well
directional
orientation
γ-irradiated,
pre-oxidized
analysis
revealed
three-layered
structure
comprising
surface
skin,
transitional
layer,
central
core.
Notably,
lamellar
thickness
exhibits
“U”-shaped
distribution,
while
long-period
structures,
orientational
properties
demonstrate
“wave-like”
pattern.
Within
this
structure,
skin
higher
level
orientation,
with
decreasing
progressively
from
toward
core
layer.
layered
crystal
was
further
corroborated
by
morphological
analysis.
In
addition,
molecular
simulations
were
performed
propose
mechanisms
underlying
formation
structure.
comprehensive
investigation
using
provides
detailed
insights
into
microstructural
characteristics
can
inform
future
advancements
material
processing
refinement
techniques
production
advanced
Energy & Environmental Science,
Journal Year:
2024,
Volume and Issue:
17(5), P. 1725 - 1755
Published: Jan. 1, 2024
This
article
summarizes
the
regulation
strategies
of
Fe-based
MOFs-derived
electrocatalysts
for
ZABs,
and
provides
a
prospect
their
future
development.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 3, 2025
Abstract
Oxygen
electrocatalysis
is
a
core
reaction
in
renewable
energy
devices,
greatly
promoting
the
transformation
and
upgrading
of
structure.
Nonetheless,
performance
conversion
devices
hindered
by
large
overpotential
slow
kinetics
oxygen
electrocatalytic
reactions.
Recently,
single‐atom
catalysts
(SACs)
have
emerged
as
promising
contenders
field
because
their
exceptional
metal
atom
utilization,
distinctive
coordination
environment,
adjustable
electronic
properties.
This
review
presents
latest
advancements
design
Co‐based
SACs
for
electrocatalysis.
First,
OER
ORR
mechanisms
are
introduced.
Subsequently,
strategies
regulating
structure
summarized
three
aspects,
including
centers,
support
carriers.
A
particular
emphasis
given
to
relationship
between
properties
catalysts.
Afterward,
applications
explored.
Ultimately,
challenges
prospects
prospected.
ACS Applied Engineering Materials,
Journal Year:
2024,
Volume and Issue:
2(7), P. 1894 - 1907
Published: June 28, 2024
Fuel
cells
have
emerged
as
a
promising
alternative
to
conventional
energy
sources
due
their
high
conversion
efficiency
and
low
environmental
impact.
However,
the
development
of
efficient
cost-effective
catalysts
for
fuel
cell
electrodes
remains
significant
challenge.
Carbon
quantum
dots
(CQDs)
candidates,
with
unique
electronic
optical
traits,
excellent
electrochemical
activity,
cost-effectiveness.
We
synthesized
CQD
investigated
its
structural
transformation
into
carbon
nanoneedles
through
N
F
codoping,
employing
an
innovative
approach
enhance
efficiency,
particularly
in
field
oxygen
electrochemistry.
This
process
maximizes
defects,
reduces
band
gap
from
2.52
1.34
eV,
enhances
charge
distribution
lattice,
which
facilitates
easy
e–
transfer,
studied
density
functional
theory
analysis.
Notably,
N/F-CQD
catalyst
exhibits
exceptional
durability,
maintaining
∼23
mV
degradation
after
30000
cycles,
showcasing
robustness
prolonged
operational
conditions
finding
suitability
practical
applications.
Moreover,
peak
power
90
mW
cm–2
at
load
current
∼230
mA
under
ambient
pressure
temperature
50–55
°C,
emphasizing
potential
nonmetallic
catalyst.
The
introduction
N/F
codoping
demonstrates
promise
enhancing
behavior,
paving
way
nonmetal
cathodic
reduction
reaction
(ORR)
electrocatalyst
anion-exchange
membrane
Small,
Journal Year:
2024,
Volume and Issue:
20(43)
Published: July 2, 2024
Flexible
rechargeable
Zn-air
batteries
(FZABs)
exhibit
high
energy
density,
ultra-thin,
lightweight,
green,
and
safe
features,
are
considered
as
one
of
the
ideal
power
sources
for
flexible
wearable
electronics.
However,
slow
overpotential
oxygen
reaction
at
air
cathode
has
become
key
factors
restricting
development
FZABs.
The
improvement
activity
stability
bifunctional
catalysts
a
top
priority.
At
same
time,
FZABs
should
maintain
battery
performance
under
different
bending
twisting
conditions,
design
overall
structure
is
also
important.
Based
on
understanding
three
typical
configurations
working
principles
FZABs,
this
work
highlights
two
common
strategies
applying
to
FZABs:
1)
powder-based
2)
self-supported
cathode.
It
summarizes
recent
advances
in
electrocatalysts
explores
various
types
catalyst
structures
well
related
mechanistic
understanding.
latest
research
advances,
paper
introduces
discusses
modulation
expects
guide
synthesis
preparation
efficient
catalysts.
Finally,
current
status
challenges
summarized.
