2D single-faceted IrO2(101) monolayer enabling high-performing proton exchange membrane water electrolysis beyond 8,000 h stability at 1.5 A cm-2
Abstract
Both
commercially
available
and
laboratory-synthesized
IrO2
catalysts
typically
possess
rutile-type
structures
diverse
facet
orientations.
According
to
the
theoretical
results
from
density
functional
theory
calculations,
distinct
facets
will
result
in
divergent
electrocatalytic
properties,
among
which
(101)
crystal
is
theoretically
predicted
as
most
energetically
favorable
for
oxygen
evolution
reaction
(OER)
owing
its
lowest
energy
barrier.
Maintaining
a
single-unit-cell
thickness
while
exposing
desired
of
2D
presents
significant
opportunity
challenge
development
high-performance
OER
anode
catalysts.
Herein,
we
develop
an
ammonia-induced
engineering
oriented
modulation
ultimate
limit
monolayer
thickness,
successfully
synthesize
unique
facet.
At
current
10
mA
cm-2geo,
ultralow
overpotential
230
mV
has
been
achieved
on
highly
activated
three-electrode
system.
More
importantly,
proton
exchange
membrane
(PEM)
electrolyzer,
reaches
low
voltage
1.74
V
at
industrial-level
2
A
much
lower
than
that
all
commercial
electrocatalysts.
Though
primarily
contributes
modulating
intrinsic
activity
rather
stability,
as-prepared
IrO2(101)
performs
over
8,000
hours
PEM
water
electrolysis
(PEMWE)
stability
constant
1.5
with
negligible
decay
rate
4.0
kh-1.
Furthermore,
even
long-term
PEMWE
test
1000
h
using
electrode
assembly
(MEA)
ultra-low
Ir
loading
0.2
mgIr
cm-2geo
under
fluctuating
operating
conditions
performed,
E Cell
remains
electrochemically
stable
time
without
any
signs
catalyst
degradation.
This
work
proposes
could
represent
novel
approach
selectively
expose
facet,
thereby
enabling
facet-dependent
performance
ultrahigh
industrial-scale
electrolysis,
fluctuations
generated
by
solar
wind
power.
Research Square (Research Square), Год журнала: 2024, Номер unknown
Опубликована: Окт. 24, 2024
Язык: Английский
