Two-dimensional
WS2
offers
promising
advantages
for
various
applications
due
to
its
semiconducting
1H
phase
and
metallic
1T
phase.
However,
the
instability
of
difficulty
achieving
a
stable
coexistence
present
significant
challenges.
Here,
we
adopt
NaCl-assisted
one-step
chemical
vapor
deposition
method
that
enables
spatial
precise
control
phases
within
monolayer
WS2.
The
diagram
establishes
clear
correlation
between
precursor
ratios
structural
Density
functional
theory
calculations
reveal
stability
difference
at
electronic
level.
Calculated
work
functions
are
consistent
with
experimental
Kelvin
probe
force
microscopy,
confirming
properties
heterophase
interface.
This
provides
scalable
efficient
approach
engineering
in
WS2,
great
potential
advancing
optoelectronic
devices
catalytic
systems.
Abstract
Double
transition
metal
(DTM)
MXenes
are
a
recently
discovered
class
of
two‐dimensional
composite
nanomaterials
with
excellent
potential
in
energy
storage
applications.
Since
their
emergence
2015,
DTM
have
expanded
composition
boundary
beyond
traditional
single‐metal
carbide
and
nitride
MXenes.
offer
tunable
structures
properties
through
variations
the
constituent
metals
positioning
within
layered
lattice.
These
can
exist
two
primary
forms:
ordered
DTMs
solid
solutions.
The
compositional
versatility
offers
opportunities
to
enhance
performance
electrochemical
However,
quality,
stability,
surface
chemistry
influenced
by
several
factors,
including
etching
process,
etchant
type,
synthesis
route.
Currently,
limited
literature
is
available
on
experimentally
synthesized
MXenes,
most
studies
focusing
carbide‐based
Most
articles
dedicated
efforts
only
generalized
strategies.
Although
extensive
theoretical
explored
suitability
etchants,
parameters,
methods
for
producing
high‐quality
MXene
selective
terminal
functional
groups,
stability
issues
not
been
thoroughly
examined.
This
review
addresses
various
types
techniques,
impact
these
physicochemical
performance.
Additionally,
it
provides
critical
analysis
causes
instability
particularly
DTMs,
from
application.
challenges
associated
materials
discussed,
along
prospects
enhancing
synthesis,
structural
tuning,
modification,
applications
storage.
image
ACS Catalysis,
Год журнала:
2024,
Номер
14(20), С. 15665 - 15674
Опубликована: Окт. 7, 2024
Understanding
the
sluggish
kinetics
of
hydrogen
evolution
reaction
(HER)
in
neutral
media
is
a
grand
challenge.
The
correlation
between
interfacial
water
structure
and
HER
activity
has
yet
to
be
determined,
particularly
for
catalysts
with
complex
chemical
compositions.
Herein,
we
used
situ
electrochemical
spectroscopic
methods
(e.g.,
surface-enhanced
infrared
absorption
shell-isolated
nanoparticle-enhanced
Raman
spectroscopy)
investigate
bonding
network
molecules
typical
Pt/C
NiCo-phosphide,
-sulfide,
-hybrid
with/without
oxide
impurity)
under
potential
bias
media.
cathodic
potentials
always
influenced
composition
water,
rendering
records
distinct
nominal
tuning
rates
among
different
catalysts.
Interestingly,
found
that
suitable
amount
surface
impurity,
inert
phase,
can
drastically
alter
dynamic
behaviors
promoting
transition
from
ice-like
liquid-like
free
while
leading
an
improved
performance
(j0
>
0.7
mA
cm–2;
η
=
101.7
mV@10
cm–2).
Such
effect
was
presumably
correlated
hydrophilic
moieties,
as
evidenced
by
studies
pure
hydroxide
controls.
This
work
provides
insights
understanding
media,
paving
way
rational
design
electrocatalysts.
Molecules,
Год журнала:
2025,
Номер
30(2), С. 241 - 241
Опубликована: Янв. 9, 2025
In
this
research,
we
synthesized
a
series
of
Ti3C2Tx
nanosheets
with
varying
lateral
dimensions
and
conducted
thorough
investigation
into
the
profound
relationship
between
electrochemical
performance
materials
their
sizes.
This
study
innovatively
incorporates
clever
combination
small-sized
large-sized
in
electrode
preparation
process.
strategy
yields
excellent
results
at
low
scan
rates,
fabricated
achieving
high
volumetric
capacitance
approximately
658
F/g.
Even
more
remarkable
is
fact
that,
even
under
extreme
testing
conditions
where
rate
surges
to
10
V
s-1,
retains
its
capacitive
characteristics
robustly
without
any
significant
degradation.
These
outstanding
underscore
exceptional
ability
maintain
energy
storage
capacity
during
rapid
charge-discharge
cycles,
holding
importance
for
advancing
development
devices
fast
response
times
power
densities.
Abstract
To
investigate
the
potential
of
MXene‐catalyzed
electroreduction
carbon
dioxide
towards
achieving
highly
efficient
ECO
2
RR,
this
study
engineered
an
S
‐anchoring
site
on
Ti
3
C
T
x
MXene
for
Zn
ion
coordination.
The
findings
revealed
that
was
uniformly
distributed
across
surface
and
interface,
either
replacing
or
integrating
with
functional
groups,
effectively
coordinating
Zn.
Subsequently,
nanoparticles
were
synthesized
leveraging
defect‐induced
self‐reduction
capability
support.
presence
facilitated
rapid
electron
transfer
to
Zn,
accelerated
activation
dioxide,
endowed
Zn‐S‐MXene
a
larger
active
area,
enhanced
RR
selectivity,
faster
charge
rate.
Consequently,
CO
selectivity
significantly
enhanced,
reaching
impressive
FE
89.7%.
This
offers
novel
perspectives
utilization
atomic
modifications
in
materials
design
optimization
through
strategic
pairing
metal
ions.
