Abstract
In
this
study,
Co‐doped
SnO
2
is
synthesized
atop
the
hexagonal
CoS
template
(CoSS)
via
direct
air
calcination
of
as‐synthesized
SnS
(CoS)
nanosheets.
The
structural
evolution
facilitated
emergence
Co
2+
and
3+
states,
complemented
by
surface‐adsorbed
sulfur
oxyanions
(SO
4
2−
,
HSO
3
‐
SO
).
CoSS
deposited
over
carbon
cloth
(CoSS/CC)
exhibited
superior
bifunctional
HER
OER,
demonstrating
higher
stability
efficiency
than
their
CoS/CC
counterparts.
Notably,
CoSS/CC||CoSS/CC
shows
overall
water
splitting
at
a
minimum
cell
voltage
1.5
V,
significantly
lower
CoS/CC||CoS/CC.
Mechanistically,
states
serve
as
catalytically
active
sites
that
enhance
while
synergistic
interaction
between
promotes
activities.
Density
functional
theory
(DFT)
calculations
revealed
an
upshifted
d‐band
centre
(ɛ
d
)
enhanced
metal‐oxygen
covalency
(Δ)
in
CoSS,
with
charge
transfer
p‐d
hybridization.
ATR‐FTIR,
Raman,
XPS
investigations
confirmed
surface
reconstruction
CoSS/CC
electrodes
electrical
conductivity.
It
related
highly
strained
system
V
O
‐CoSS
has
more
unfilled
electronic
near
Fermi
level
F
to
facilitate
stable
HER/OER
intermediates.
Overall,
study
underscores
electrocatalytic
CoS/CC,
establishing
it
promising
candidate
for
efficient
splitting.
Materials Chemistry Frontiers,
Год журнала:
2023,
Номер
7(24), С. 6254 - 6280
Опубликована: Янв. 1, 2023
This
review
presents
comprehensive
details
on
recent
developments
in
the
fabrication
of
different
amorphous–crystalline
heterostructures,
their
compositions,
and
resulting
physicochemical
properties
for
OER,
HER,
overall
water
splitting.
Abstract
Electron
density
manipulation
of
active
sites
in
cocatalysts
is
great
essential
to
realize
the
optimal
hydrogen
adsorption/desorption
behavior
for
constructing
high‐efficient
H
2
‐evolution
photocatalyst.
Herein,
a
strategy
about
weakening
metal–metal
bond
strength
directionally
optimize
electron
channel‐sulfur(S)
1T′
Re
1−
x
Mo
S
cocatalyst
clarified
improve
their
adsorption
(S─H
bond)
rapid
‐production
reaction.
In
this
case,
ultrathin
nanosheet
situ
anchored
on
TiO
surface
form
/TiO
photocatalyst
by
facial
molten
salt
method.
Remarkably,
numerous
visual
bubbles
are
constantly
generated
0.92
0.08
sample
with
10.56
mmol
g
−1
h
rate
(apparent
quantum
efficiency
50.6%),
which
2.6
times
higher
than
that
traditional
ReS
sample.
Density
functional
theory
and
situ/ex
X‐ray
photoelectron
spectroscopy
results
collectively
demonstrate
weakened
Re─Re
via
introduction
can
induce
formation
unique
electron‐deficient
channel‐S
suitable
density,
yield
thermoneutral
S─H
bonds
superior
interfacial
‐generation
performance.
This
work
provides
fundamental
guidance
purposely
optimizing
electronic
state
manipulating
intrinsic
bonding
structure,
opens
an
avenue
designing
efficacious
photocatalytic
materials.
Abstract
Curvature
of
carbon
materials
has
gained
significant
attention
as
catalysts
due
to
their
distinctive
properties
and
potential
applications.
This
review
comprehensively
summarizes
how
the
bending
can
improve
electrocatalytic
performance,
with
special
applications
various
bent
(such
nanotubes,
graphene,
fullerene)
in
electrocatalysts
a
large
number
related
density
functional
theory
(DFT)
theoretical
calculations.
Extensive
mechanism
research
provided
wealth
evidence
indicating
that
curvature
profound
impact
on
catalytic
activity.
improvement
performance
by
curved
is
attributed
factors
like
larger
active
surface
area,
modulation
electronic
structure,
better
dispersal
sites.
A
comprehensive
understanding
utilization
these
effects
enable
design
highly
efficient
carbon‐based
for
energy
conversion,
environmental
remediation,
chemical
synthesis.
Energy & Fuels,
Год журнала:
2024,
Номер
38(17), С. 16861 - 16872
Опубликована: Авг. 8, 2024
To
overcome
the
high
cost
of
established
electrocatalysts
(viz.,
Pt/C
and
RuO2),
there
is
a
pressing
need
to
replace
them
with
highly
efficient,
cost-effective,
sustainable
electrocatalysts.
In
this
study,
series
Co-substituted
orthorhombic
tin
sulfide-reduced
graphene
oxide
(SnS-rGO)
[CTSx-rGO,
(x:
0.1
0.3)]
catalysts
were
produced
via
one-pot
hydrothermal
process.
potassium
hydroxide
(1.0
mol/L),
CTSx-rGO
acts
as
competent
stable
catalyst
for
both
oxygen
evolution
reaction
(OER)
hydrogen
(HER)
owing
cumulative
effect
Co
SnS-rGO
composites.
substitution
improves
electrochemical
active
surface
area
(ECSA),
reduces
Rct
(charge-transfer
resistance),
tunes
electronic
configuration.
The
resulting
CTS0.2-rGO
composite
exhibited
exceptional
performance
toward
OER
HER
activities
by
offering
relatively
small
overpotentials
323.0
233.1
mV
at
20
mA/cm2,
respectively,
long-term
stability
up
50
h
ECSA
that
attributable
improvement
specific
ample
sites
from
in
situ
structural
morphology
change
substitution.
This
work
facilitates
strengthens
development
an
efficient
SnS-rGO-based
heterostructure
electrocatalyst
overall
water
splitting.
