ACS Applied Nano Materials,
Journal Year:
2024,
Volume and Issue:
7(9), P. 10046 - 10055
Published: April 30, 2024
Ceramic
aerogels
exhibit
great
potential
in
thermal
insulation
due
to
their
ultralow
density,
high
porosity,
conductivity,
and
good
chemical
stability.
However,
the
application
of
traditional
oxide
ceramic
extreme
environments
is
limited.
Herein,
we
proposed
an
ultra-high
temperature
(UHTC)
aerogel
designed
by
ZrC
nanofibers
welded
with
carbon
nanoparticles.
Among
them,
flexible
nanofibers,
as
basic
1D
assembly
blocks,
were
assembled
into
a
stable
3D
porous
structure
through
nanoparticles
converted
resorcinol
formaldehyde
resin
(RF).
The
obtained
multiscale
fibrous
framework
endows
density
(0.0133–0.0282
g
cm–3),
porosity
(99.73–99.07%),
compressive
strength
(0.7–18.9
kPa),
conductivity
(0.185–0.249
W
m–1
K–1),
high-temperature
stability
at
1400
°C
under
vacuum.
These
comprehensive
properties
can
be
tailored
adjusting
RF
content.
study
provides
promising
perspectives
for
nanofiber
applications.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 15, 2024
Abstract
Metal
oxides
with
spinel
structure
have
garnered
increasing
attention
as
promising
alternatives
to
noble
metal‐based
electrocatalysts.
However,
these
electrocatalysts
often
fail
simultaneously
exhibit
high
activity
and
stability
for
both
hydrogen
evolution
reaction
(HER)
oxygen
(OER),
limiting
their
applications
in
electrocatalytic
water
splitting.
Herein,
crystalline/amorphous
heterogeneous
interfaces
are
successfully
introduced
into
NiCo
2
O
4
nanosheets,
which
grown
situ
on
carbon
cloth
(CC),
denoted
‐B‐CC.
The
amorphous/crystalline
heterostructures
combine
the
advantages
of
phases
amorphous
phase
nanosheets
modulates
electron
density,
provides
abundant
single
vacancies
active
sites,
enhances
corrosion
resistance,
while
crystalline
improves
conductivity.
Density
functional
theory
(DFT)
calculations
performed
investigate
influence
surface
vacancy
(SV
)
OER
HER
processes.
NiCo₂O₄‐B‐CC
exhibits
overpotentials
only
26
mV
215
at
a
current
density
10
mA
cm
−2
.
It
excellent
performance
splitting,
achieving
400
an
applied
voltage
2.0
V.
construction
novel
approach
enhancing
metal
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 26, 2024
Abstract
Electrocatalysis
represents
an
efficient
and
eco‐friendly
approach
to
energy
conversion,
enabling
the
sustainable
synthesis
of
valuable
chemicals
fuels.
The
deliberate
engineering
electrocatalysts
is
crucial
improving
efficacy
scalability
electrocatalysis.
Notably,
occurrence
in
situ
amorphization
within
has
been
observed
during
various
electrochemical
processes,
influencing
conversion
efficiency
catalytic
mechanism
understanding.
Of
note,
dynamic
transformation
catalysts
into
amorphous
structures
complex,
often
leading
configurations.
Therefore,
revealing
this
process
understanding
function
species
are
pivotal
for
elucidating
structure‐activity
relationship
electrocatalysts,
which
will
direct
creation
highly
catalysts.
This
review
examines
mechanisms
behind
structure
formation,
summarizes
characterization
methods
detecting
species,
discusses
strategies
controlling
(pre)catalyst
properties
conditions
that
influence
amorphization.
It
also
emphasizes
importance
spontaneously
formed
oxidation
reduction
reactions.
Finally,
it
addresses
challenges
electrocatalysts.
aiming
guide
efficient,
selective,
stable
reactions,
inspire
future
advancements
field.
