Micromachines,
Год журнала:
2022,
Номер
13(9), С. 1499 - 1499
Опубликована: Сен. 9, 2022
MXenes,
a
novel
family
of
2D
transition
metal
carbide,
nitride
and
carbonitride
materials,
have
been
gaining
tremendous
interest
in
recent
days
as
potential
electrocatalysts
for
various
electrochemical
reactions,
including
hydrogen
evolution
reaction
(HER).
MXenes
are
characterized
by
their
etchable
layers,
excellent
structural
stability,
versatility
heteroatoms
doping,
electronic
conductivity,
unique
surface
functional
groups
admirable
area,
suitable
the
role
electrocatalyst/support
such
HER.
In
this
review
article,
we
summarized
developments
MXene-based
synthesis
HER
performance
terms
theoretical
experimental
point
view.
We
systematically
evaluated
superiority
catalysts
over
traditional
Pt/C
kinetics,
Tafel
slope,
overpotential
both
acidic
alkaline
electrolytic
environments.
also
pointed
out
motives
behind
electro
catalytic
enhancements,
effect
conditions,
heteroatom
terminations
on
electrocatalytic
active
sites
families.
At
end,
possible
approaches
were
recommended
deeper
understanding
improvement
Nano-Micro Letters,
Год журнала:
2023,
Номер
15(1)
Опубликована: Март 15, 2023
Abstract
Since
the
discovery
in
2011,
MXenes
have
become
rising
star
field
of
two-dimensional
materials.
Benefiting
from
metallic-level
conductivity,
large
and
adjustable
gallery
spacing,
low
ion
diffusion
barrier,
rich
surface
chemistry,
superior
mechanical
strength,
exhibit
great
application
prospects
energy
storage
conversion,
sensors,
optoelectronics,
electromagnetic
interference
shielding
biomedicine.
Nevertheless,
two
issues
seriously
deteriorate
further
development
MXenes.
One
is
high
experimental
risk
common
preparation
methods
such
as
HF
etching,
other
difficulty
obtaining
with
controllable
groups.
Recently,
Lewis
acidic
a
brand-new
strategy
for
MXenes,
has
attracted
intensive
attention
due
to
its
safety
ability
endow
uniform
terminations.
However,
comprehensive
review
etching
method
not
been
reported
yet.
Herein,
we
first
introduce
following
four
aspects:
mechanism,
terminations
regulation,
in-situ
formed
metals
delamination
multi-layered
Further,
applications
MXene-based
hybrids
obtained
by
route
sensors
microwave
absorption
are
carefully
summarized.
Finally,
some
challenges
opportunities
also
presented.
Although
challenges
remain,
synergistic
adjusting
various
microstructures
and
photo/electrochemical
parameters
of
graphitic
carbon
nitride
(g-C3
N4
)
in
photocatalytic
hydrogen
evolution
reaction
(HER)
are
the
keys
to
alleviating
energy
crisis
environmental
pollution.
In
this
work,
a
novel
nitrogen-defective
sulfur-doped
g-C3
(S-g-C3
-D)
is
designed
elaborately.
Subsequent
physical
chemical
characterization
proved
that
developed
S-g-C3
-D
not
only
displays
well-defined
2D
lamellar
morphology
with
large
porosity
high
specific
surface
area
but
also
has
an
efficient
light
utilization
carriers-separation
transfer.
Moreover,
calculated
optimal
Gibbs
free
adsorbed
(ΔGH*
for
at
S
active
sites
close
zero
(≈0.24
eV)
on
basis
first-principle
density
functional
theory
(DFT).
Accordingly,
catalyst
shows
H2
rate
5651.5
µmol
g-1
h-1
.
Both
DFT
calculations
experimental
results
reveal
memorable
defective
/S-doped
step-scheme
heterojunction
constructed
between
S-doped
domains
N-defective
structural
configuration
-D.
This
work
exhibits
significant
guidance
design
fabrication
high-efficiency
photocatalysts.
