ACS Catalysis,
Год журнала:
2023,
Номер
13(16), С. 10672 - 10682
Опубликована: Июль 31, 2023
The
acidic
water-splitting
technology
based
on
the
polymer
exchange
membrane
can
produce
hydrogen
efficiently,
continuously,
and
cleanly,
which
is
expected
to
alleviate
energy
crisis.
However,
even
noble
metal-based
electrocatalysts
such
as
IrOx
species
would
dissolve
rapidly
during
oxygen
evolution.
Herein,
we
successfully
assemble
high-density
carbon
nanotubes
(CNTs)
encapsulated
with
IrCo
nanoparticles
(NPs)
cloth
(IrCo@CNT/CC)
using
a
facile
MOF-templated
dicyandiamide-assisted
pyrolysis
strategy.
Benefiting
from
favorable
synergistic
effect
between
Co
Ir
protection
of
CNT,
obtained
IrCo@CNT/CC
only
requires
low
cell
voltage
1.500
V
reach
10
mA
cm–2
for
water
splitting
an
extremely
loading
0.027
mg
exhibits
robust
stability
under
continuous
electrolysis
90
h
in
0.5
M
H2SO4,
ranking
it
among
one
best
bifunctional
splitting.
Detailed
experiments
reveal
that
CNT-encapsulated
NPs
remain
after
evolution
reaction
(HER)
but
transform
into
Co-doped
IrO2
(OER).
Further
DFT
simulation
calculations
confirm
doping
optimize
their
electronic
structures
lower
barriers
HER
OER,
respectively.
Accounts of Materials Research,
Год журнала:
2022,
Номер
3(10), С. 1088 - 1100
Опубликована: Сен. 26, 2022
ConspectusThe
deployment
of
hydrogen
as
alternative
energy
carrier
is
a
promising
route
to
reduce
the
consumption
fossil
fuel
and
achieve
"zero
carbon"
target.
Water
electrolysis,
powered
by
renewable
sources,
regarded
most
environmentally
friendly
efficient
technology
for
production.
Generally,
sluggish
oxygen
evolution
reaction
(OER)
process
at
anode
predominantly
limits
efficiency
water
electrolysis.
Therefore,
developing
highly
electrocatalysts
accelerate
OER
kinetic
has
always
been
crucial
hot
topic.
Recently,
transition
metal
oxide
(TMO)-based
materials
have
attracted
much
attention
because
their
facile
fabrication,
low
cost,
synergistic
effects
between
coupled
metals.
However,
further
enhancement
catalytic
performance
TMO
encounters
bottleneck
originated
from
limited
regulation
strategies.Typically,
strategies
oxide-based
could
be
classified
into
three
different
levels.
(1)
For
bulk
electrocatalyst,
reducing
particle
size
would
generate
more
catalytically
active
sites,
which
usually
adopted
basic
method
enhance
overall
activities.
simple
reduction
in
demonstrated
promotion
performance,
intrinsic
activity
individual
sites
still
very
low.
(2)
To
TMO,
mesoscale
modulation
are
proposed,
involve
optimization
interfaces
where
embedded
in,
including
surface
reconstruction,
constructing
heterostructure,
phase
engineering.
(3)
In
addition
interface
modulation,
remarkable
focus
on
enhancing
atomic
level,
such
heteroatom
doping,
defect
engineering,
so
on.
themselves,
recent
advances
that
external
field
can
also
manipulate
property
TMO-based
coupling
with
sites.
All
these
afford
considerable
opportunities
fundamental
investigation
practical
applications
electrocatalysts.In
this
Account,
we
highlighted
progress
electrocatalysts.
We
started
introduction
two
mechanisms
process.
Then
conducted
an
in-depth
discussion
about
used
activities
electrocatalysts,
application
field.
end
Account
summary
current
challenges
point
out
some
possible
future
designing
Seawater
is
the
most
abundant
natural
water
resource
in
world,
which
an
inexhaustible
and
low-cost
feedstock
for
hydrogen
production
by
alkaline
electrolysis.
It
appearling
to
develop
robust
stable
electrocatalysts
seawater
However,
development
of
electrolysis
seriously
impeded
anodic
chloride
corrosion
chlorine
evolution
reaction,
few
non-noble
show
prominent
catalytic
performance
excellent
durability.
Here,
a
heterogeneous
electrocatalyst
constructed
situ
growing
highly
dispersed
iron-rich
bimetallic
phosphide
nanoparticles
on
metallic
Ni3
N
(Fe2-2x
Co2x
P/Ni3
N),
exhibits
outstanding
bifunctional
activities
splitting,
reported.
The
optimal
(Fe0.74
Co0.26
)2
Fe2
demand
only
113
212
mV
afford
100
mA
cm-2
oxygen
reactions
(HER
OER)
1
m
KOH,
respectively,
thus
substantially
expediting
overall
water/seawater
at
with
1.592/1.645
V.
Particularly,
displays
unprecedented
overpotential
302
500
,
represents
best
activity
among
ever-reported
electrocatalysts;
expedites
splitting
1.701/1.768
V,
surpassing
reported
lectrocatalysts.
This
work
provides
new
approach
developing
high-performance
splitting.
ACS Catalysis,
Год журнала:
2023,
Номер
13(16), С. 10672 - 10682
Опубликована: Июль 31, 2023
The
acidic
water-splitting
technology
based
on
the
polymer
exchange
membrane
can
produce
hydrogen
efficiently,
continuously,
and
cleanly,
which
is
expected
to
alleviate
energy
crisis.
However,
even
noble
metal-based
electrocatalysts
such
as
IrOx
species
would
dissolve
rapidly
during
oxygen
evolution.
Herein,
we
successfully
assemble
high-density
carbon
nanotubes
(CNTs)
encapsulated
with
IrCo
nanoparticles
(NPs)
cloth
(IrCo@CNT/CC)
using
a
facile
MOF-templated
dicyandiamide-assisted
pyrolysis
strategy.
Benefiting
from
favorable
synergistic
effect
between
Co
Ir
protection
of
CNT,
obtained
IrCo@CNT/CC
only
requires
low
cell
voltage
1.500
V
reach
10
mA
cm–2
for
water
splitting
an
extremely
loading
0.027
mg
exhibits
robust
stability
under
continuous
electrolysis
90
h
in
0.5
M
H2SO4,
ranking
it
among
one
best
bifunctional
splitting.
Detailed
experiments
reveal
that
CNT-encapsulated
NPs
remain
after
evolution
reaction
(HER)
but
transform
into
Co-doped
IrO2
(OER).
Further
DFT
simulation
calculations
confirm
doping
optimize
their
electronic
structures
lower
barriers
HER
OER,
respectively.
