Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 30, 2024
Abstract
The
applications
of
Fe‐based
electrocatalysts
in
oxygen
evolution
reactions
(OER)
and
hydrogen
(HER)
are
hindered
due
to
poor
stability
catalytic
activity
originating
from
rapid
Fe
leaching
the
intrinsic
electronic
structure
FeOOH.
Here,
study
presents
a
strategy
precisely
continuously
tune
morphology
FeOOH
covalent
characteristics
Fe–O
bonds
by
controlling
coverage
extracellular
polymeric
substances
(EPS)
on
surface.
Operando
spectroscopy
theoretical
calculations
reveal
that
regulating
covalency
induces
changes
intermediate
adsorption
strength
metal
leaching,
leading
volcano‐shaped
trend
durability
as
function
covalency.
Notably,
HER,
negatively
charged
sites
EPS
exhibit
superior
*H
compared
bare
In
particular,
2
@FeOOH
exhibits
excellent
performance
for
both
OER
(η
10
=
240
mV)
HER
52
mV),
with
outstanding
over
200
hours
at
100
mA
cm⁻
.
current
density
also
reaches
merely
1.51
V
two‐electrode
configuration,
significantly
surpassing
other
bifunctional
electrocatalysts.
This
approach
will
provide
promising
pathway
enhance
water
electrolysis
through
precise
modulation
coverage.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 29, 2024
Abstract
The
preferential
adsorption
toward
OH
−
on
the
anode
most
likely
blocks
accessibility
of
organic
molecules
and
triggers
competitive
oxygen
evolution
reaction
(OER),
typically
precipitating
a
narrow
potential
window.
Here,
an
deconfinement
strategy
enabled
by
CO
3
2−
self‐transformed
from
C
2
O
4
metallic
nickel
oxalate
(NiC
)
for
efficient
synthesis
bioplastic
monomer
2,5‐furanedicarboxylic
acid
(FDCA)
with
faradaic
efficiency
>95%
via
electrocatalytic
5‐hydroxymethylfurfural
(HMF)
oxidation
(e‐HMFOR)
at
wider
window
1.38–1.56
V
RHE
,
outperforming
state‐of‐the‐art
Ni‐based
electrocatalysts
is
presented.
In
situ,
tests
corroborate
that
construction
NiOOH
surface‐adsorbed
(NiOOH‐CO
NiC
can
be
facilitated
self‐liberating
.
ions
serving
as
electric
field
engine
effectively
weaken
coverage
through
electrostatic
repulsion
enhance
HMF
NiOOH‐CO
surface,
thereby
heightening
e‐HMFOR
while
inhibiting
OER.
Computational
results
further
indicate
hoists
energy
barrier
intermediate
conversion
(O*
→
OOH*)
to
suppress
OER
but
promotes
kinetics.
precise
modulation
behavior
electrocatalyst
offers
powerful
kit
boosting
oxidative
upgrading
process
circumventing
competing
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 30, 2024
Abstract
The
applications
of
Fe‐based
electrocatalysts
in
oxygen
evolution
reactions
(OER)
and
hydrogen
(HER)
are
hindered
due
to
poor
stability
catalytic
activity
originating
from
rapid
Fe
leaching
the
intrinsic
electronic
structure
FeOOH.
Here,
study
presents
a
strategy
precisely
continuously
tune
morphology
FeOOH
covalent
characteristics
Fe–O
bonds
by
controlling
coverage
extracellular
polymeric
substances
(EPS)
on
surface.
Operando
spectroscopy
theoretical
calculations
reveal
that
regulating
covalency
induces
changes
intermediate
adsorption
strength
metal
leaching,
leading
volcano‐shaped
trend
durability
as
function
covalency.
Notably,
HER,
negatively
charged
sites
EPS
exhibit
superior
*H
compared
bare
In
particular,
2
@FeOOH
exhibits
excellent
performance
for
both
OER
(η
10
=
240
mV)
HER
52
mV),
with
outstanding
over
200
hours
at
100
mA
cm⁻
.
current
density
also
reaches
merely
1.51
V
two‐electrode
configuration,
significantly
surpassing
other
bifunctional
electrocatalysts.
This
approach
will
provide
promising
pathway
enhance
water
electrolysis
through
precise
modulation
coverage.
