Advanced Functional Materials,
Год журнала:
2023,
Номер
33(45)
Опубликована: Сен. 1, 2023
Abstract
Oxygen
evolution
reaction
(OER)
remains
a
bottleneck
for
electrocatalytic
water‐splitting
to
generate
hydrogen.
However,
the
traditional
adsorbed
mechanism
(AEM)
possesses
sluggish
kinetics
due
scaling
relationship,
while
lattice
oxygen
(LOM)
triggers
an
unstable
structure
escaping
of
oxygen.
Herein,
proof‐of‐concept
Fe‐Co(OH)
2
/Fe
O
3
heterostructure
is
put
forward,
where
following
AEM
can
complete
rapidly
deprotonation
process
Fe
LOM
trigger
O─O
coupling
step.
Combining
theoretical
and
experimental
investigation
confirmed
that
redistributed
space‐charge
junction
optimize
synergistically
oxygen,
facilitate
synchronously
OER
activity
stability.
As
result,
shows
excellent
performance
with
low
overpotential
only
219
249
mV
reach
current
density
10
100
mA
cm
−2
.
Specifically,
electrocatalyst
maintains
long‐term
stability
h
at
large
This
work
paves
avenue
break
through
limit
conventional
mechanism.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Апрель 5, 2024
Abstract
Seawater
electroreduction
is
attractive
for
future
H
2
production
and
intermittent
energy
storage,
which
has
been
hindered
by
aggressive
Mg
2+
/Ca
precipitation
at
cathodes
consequent
poor
stability.
Here
we
present
a
vital
microscopic
bubble/precipitate
traffic
system
(MBPTS)
constructing
honeycomb-type
3D
robust
anti-precipitation
seawater
reduction
(SR),
massively/uniformly
release
small-sized
bubbles
to
almost
every
corner
of
the
cathode
repel
precipitates
without
break.
Noticeably,
optimal
with
built-in
MBPTS
not
only
enables
state-of-the-art
alkaline
SR
performance
(1000-h
stable
operation
–1
A
cm
−2
)
but
also
highly
specialized
in
catalytically
splitting
natural
into
greatest
ability.
Low
amounts
after
prolonged
tests
under
large
current
densities
reflect
genuine
efficacy
our
MBPTS.
Additionally,
flow-type
electrolyzer
based
on
stably
functions
industrially-relevant
500
mA
150
h
while
unwaveringly
sustaining
near-100%
Faradic
efficiency.
Note
that
estimated
price
(~1.8
US$/kg
H2
even
cheaper
than
US
Department
Energy’s
goal
(2
).
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(37)
Опубликована: Июль 24, 2023
Abstract
Electricity‐driven
organo‐oxidations
have
shown
an
increasing
potential
recently.
However,
oxygen
evolution
reaction
(OER)
is
the
primary
competitive
reaction,
especially
under
high
current
densities,
which
leads
to
low
Faradaic
efficiency
(FE)
of
product
and
catalyst
detachment
from
electrode.
Here,
we
report
a
bimetallic
Ni−Cu
electrocatalyst
supported
on
Ni
foam
(Ni−Cu/NF)
passivate
OER
process
while
oxidation
5‐hydroxymethylfurfural
(HMF)
significantly
enhanced.
A
density
1000
mA
cm
−2
can
be
achieved
at
1.50
V
vs
.
reversible
hydrogen
electrode,
both
FE
yield
keep
close
100
%
over
wide
range
potentials.
Both
experimental
results
theoretical
calculations
reveal
that
Cu
doping
impedes
OH*
deprotonation
O*
hereby
greatly
passivated.
Those
instructive
provide
new
approach
realizing
highly
efficient
biomass
upgrading
by
regulating
activity.
Science,
Год журнала:
2023,
Номер
381(6660), С. 857 - 861
Опубликована: Авг. 24, 2023
Methane
pyrolysis
(MP)
is
a
potential
technology
for
CO2-free
hydrogen
production
that
generates
only
solid
carbon
by-products.
However,
developing
highly
efficient
catalyst
stable
methane
at
moderate
temperature
has
been
challenging.
We
present
new
and
created
by
modifying
Ni-Bi
liquid
alloy
with
the
addition
of
Mo
to
produce
ternary
NiMo-Bi
(LAC).
This
exhibited
considerably
low
activation
energy
81.2
kilojoules
per
mole,
which
enabled
MP
temperatures
between
450
800
Celsius
generation
efficiency
4.05
ml
gram
nickel
minute.
At
Celsius,
100%
H2
selectivity
120
hours
stability.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Апрель 4, 2024
Abstract
Electrocatalytic
water
splitting
is
a
promising
route
for
sustainable
hydrogen
production.
However,
the
high
overpotential
of
anodic
oxygen
evolution
reaction
poses
significant
challenge.
SrIrO
3
-based
perovskite-type
catalysts
have
shown
great
potential
acidic
reaction,
but
origins
their
activity
are
still
unclear.
Herein,
we
develop
Co-doped
system
to
enhance
and
elucidate
origin
catalytic
activity.
In
situ
experiments
reveal
Co
activates
surface
lattice
oxygen,
rapidly
exposing
IrO
x
active
sites,
while
bulk
doping
optimizes
adsorbate
binding
energy
.
The
demonstrates
electrocatalytic
activity,
markedly
surpassing
commercial
2
in
both
conventional
electrolyzer
proton
exchange
membrane
electrolyzer.
