The
electrocatalytic
reduction
reaction
of
nitrate
(NO3RR)
is
anticipated
to
convert
nitrogen-containing
pollutants
into
valuable
ammonia
products.
Copper-based
catalysts
have
received
great
attention
because
their
good
performance
in
the
NO3RR
due
strong
binding
energy
with
*NO3
intermediates.
However,
poor
H2O
dissociation
ability
Cu
unable
provide
H•
time
for
hydrogenation
NOx,
thus
hindering
electroreduction
NO3-.
Herein,
we
designed
a
shell-core
nanocube
electrocatalyst
Cu2O@Ni(OH)2-x
(x
represents
molar
ratio
Ni/Cu)
using
liquid
phase
combined
etching
and
precipitation
method
NO3RR.
Due
synergistic
effect
between
activation
excellent
Ni(OH)2,
Cu2O@Ni(OH)2-3.3%
shows
an
impressive
yield
rate
(557.9
μmol
h-1
cm-2)
Faradaic
efficiency
(97.4%)
at
-0.35
V
vs.
RHE.
Operando
Raman
Auger
electron
spectroscopy
observe
Cu2O
during
process.
Density
functional
theory
calculations
paramagnetic
resonance
analysis
reveals
that
Ni(OH)2
can
lower
barrier
dissociation,
thereby
promoting
generation
accelerating
*NO
This
research
provides
efficient
Cu-based
catalyst
reducing
NO3-
may
motivate
development
effective
electrocatalysts
further
experimentation.
Chemical Communications,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Structural
transformation
of
electrocatalyst
contributes
to
its
catalytic
activity
and
selectivity.
Properly
guided
stabilized
offers
enhanced
catalyst
performance,
while
unregulated
surface
reconstruction
may
lead
deactivation.
Angewandte Chemie International Edition,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 11, 2025
Abstract
Due
to
the
competitive
relationship
between
nitrate
reduction
reaction
(NO
3
−
RR)
and
hydrogen
evolution
(HER),
conventional
approach
improve
Faradaic
efficiency
is
select
a
catalyst
without
HER
activity.
Nevertheless,
such
strategy
not
only
limits
application
of
catalysts
in
NO
RR,
but
also
causes
insufficient
source,
thereby
sacrificing
ammonia
yield
rate.
We
believe
that
should
be
excluded
from
hydrogenation
reduction.
Herein,
taking
traditional
water
electrolysis
material
Co
O
4
as
model
system,
we
reveal
oxygen
vacancies
on
crystal
facet
can
greatly
promote
dissociation
capture
intermediate
for
successfully
shifting
pathway
hydrogenation.
Beyond
development,
construct
hybrid
reactor
achieve
an
recovery
rate
1216.8
g‐N
m
−2
d
−1
nuclear
industry
wastewater
with
ultra‐high
concentration.
This
study
breaks
through
limitation
which
provides
significant
insight
into
designing
mechanism.
Angewandte Chemie,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 12, 2025
Abstract
Due
to
the
competitive
relationship
between
nitrate
reduction
reaction
(NO
3
−
RR)
and
hydrogen
evolution
(HER),
conventional
approach
improve
Faradaic
efficiency
is
select
a
catalyst
without
HER
activity.
Nevertheless,
such
strategy
not
only
limits
application
of
catalysts
in
NO
RR,
but
also
causes
insufficient
source,
thereby
sacrificing
ammonia
yield
rate.
We
believe
that
should
be
excluded
from
hydrogenation
reduction.
Herein,
taking
traditional
water
electrolysis
material
Co
O
4
as
model
system,
we
reveal
oxygen
vacancies
on
crystal
facet
can
greatly
promote
dissociation
capture
intermediate
for
successfully
shifting
pathway
hydrogenation.
Beyond
development,
construct
hybrid
reactor
achieve
an
recovery
rate
1216.8
g‐N
m
−2
d
−1
nuclear
industry
wastewater
with
ultra‐high
concentration.
This
study
breaks
through
limitation
which
provides
significant
insight
into
designing
mechanism.
Advanced Energy Materials,
Journal Year:
2024,
Volume and Issue:
14(41)
Published: Aug. 7, 2024
Abstract
The
electrochemical
nitrate
reduction
for
green
ammonia
production
is
attracting
increasing
attention,
where
the
catalysts
are
widely
investigated
by
controlling
compositions
or
structures
to
achieve
high
performance.
However,
their
reconstructions
under
potentials
inevitable
and
uncontrollable,
leading
uncertain
performance,
a
confused
understanding
of
mechanism.
In
this
work,
strategy
proposed
pre‐catalyst's
reconstruction
chemistry
toward
reaction
(e‐NO
3
RR)
with
superior
activity
stability.
To
demonstrate
idea,
pre‐catalyst
fabricated
α
‐Co(OH)
2
Cu(OH)
(
/Cu(OH)
),
which
in
situ
reconstructed
tandem
catalyst
Cu
β
(Cu/
β‐
Co(OH)
)
working
potential.
Cu/
achieves
an
optimal
Faraday
efficiency
97.7%
yield
rate
3.9
mmol
h
−1
cm
−2
at
−0.5
V,
outperforming
other
reported
metal‐hydroxide
catalysts.
experimental
theoretical
results
that
catalytic
mechanism
responsible
exceptional
performance:
1)
functions
as
donor
nitrite;
2)
serves
active
sites
generating
hydrogen
reducing
nitrogen‐containing
groups.
This
work
highlights
controllable
improved
performance
can
be
realized,
provides
insightful
mechanism,
helpful
developing
stable
various
applications.
The Journal of Physical Chemistry C,
Journal Year:
2024,
Volume and Issue:
128(33), P. 13651 - 13665
Published: Aug. 12, 2024
Fundamental
understanding
of
the
key
species
during
electrochemical
reaction
process
is
vital
importance
to
mechanistic
investigation
and
catalyst
design
heavily
relies
on
experimental
observations.
The
in
situ
Raman
technique
regarded
as
a
powerful
tool
address
this
challenge,
its
collected
signals
can
spectroscopically
fingerprint
related
details
track
their
dynamic
evolution.
In
Perspective,
we
provide
an
overview
recent
developments
about
characterizations
for
reactions.
We
exemplify
merits
spectroscopic
monitoring
surface
structure
reconstruction
intermediate
evolution
at
electrified
interface
electrocatalyst
hosts.
also
discuss
how
interpret
underlying
mechanism
accordance
with
end,
present
future
perspectives
cordially
anticipate
more
insightful
contribution
sustainable
research
fields
including
electrocatalysis,
spectroelectrochemistry,
beyond.
