Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 8, 2024
Considering
the
substantial
role
of
ammonia,
developing
highly
efficient
electrocatalysts
for
nitrate-to-ammonia
conversion
has
attracted
increasing
interest.
Herein,
we
proposed
a
feasible
strategy
p-d
orbital
hybridization
via
doping
p-block
metals
in
an
Ag
host,
which
drastically
promotes
performance
nitrate
adsorption
and
disassociation.
Typically,
Sn-doped
catalyst
(SnAg)
delivers
maximum
Faradaic
efficiency
(FE)
95.5±1.85
%
NH
Nanoscale,
Journal Year:
2023,
Volume and Issue:
15(48), P. 19577 - 19585
Published: Jan. 1, 2023
Zn-NO3-
batteries
can
generate
electricity
while
producing
NH3
in
an
environmentally
friendly
manner,
making
them
a
very
promising
device.
However,
the
conversion
of
NO3-
to
involves
proton-assisted
8-electron
(8e-)
transfer
process
with
high
kinetic
barrier,
requiring
high-performance
catalysts
realize
potential
applications
this
technology.
Herein,
we
propose
heterostructured
CoO/CuO
nanoarray
electrocatalyst
prepared
on
copper
foam
(CoO/CuO-NA/CF)
that
electrocatalytically
and
efficiently
convert
at
low
achieves
maximum
yield
296.9
μmol
h-1
cm-2
Faraday
efficiency
(FE)
92.9%
-0.2
V
vs.
reversible
hydrogen
electrode
(RHE).
Impressively,
battery
based
monolithic
CoO/CuO-NA/CF
delivers
60.3
cm-2,
FENH3
82.0%,
power
density
4.3
mW
cm-2.
This
study
provides
paradigm
for
catalyst
preparation
energy-efficient
production
simultaneously
generating
electrical
energy.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(25)
Published: April 2, 2024
Abstract
Renewable
electricity‐powered
nitrate/carbon
dioxide
co‐reduction
reaction
toward
urea
production
paves
an
attractive
alternative
to
industrial
processes
and
offers
a
clean
on‐site
approach
closing
the
global
nitrogen
cycle.
However,
its
large‐scale
implantation
is
severely
impeded
by
challenging
C–N
coupling
requires
electrocatalysts
with
high
activity/selectivity.
Here,
cobalt‐nanoparticles
anchored
on
carbon
nanosheet
(Co
NPs@C)
are
proposed
as
catalyst
electrode
boost
yield
Faradaic
efficiency
(FE)
electrosynthesis
enhanced
coupling.
Such
Co
NPs@C
renders
superb
urea‐producing
activity
FE
reaching
54.3%
of
2217.5
µg
h
−1
mg
cat.
,
much
superior
NPs
C
counterparts,
meanwhile
shows
strong
stability.
The
affords
rich
catalytically
active
sites,
fast
reactant
diffusion,
sufficient
catalytic
surfaces‐electrolyte
contacts
favored
charge
ion
transfer
efficiencies.
theoretical
calculations
reveal
that
high‐rate
formation
*CO
*NH
2
intermediates
crucial
for
facilitating
synthesis.
ACS Catalysis,
Journal Year:
2024,
Volume and Issue:
14(21), P. 16205 - 16213
Published: Oct. 18, 2024
The
electrochemical
reduction
of
nitrate
ions
to
valuable
ammonia
enables
the
recovery
pollutants
from
industrial
wastewater,
thereby
synchronously
balancing
nitrogen
cycle
and
achieving
NH3
production.
However,
currently
reported
electrocatalysts
still
suffer
low
yield
rate,
Faradaic
inefficiency,
partial
current
density.
Herein,
a
strategy
based
on
regulation
d-band
center
by
Ru
doping
is
presented
boost
Theoretical
calculations
unravel
that
dopant
in
Ni
metal–organic
framework
shifts
neighboring
sites
upward,
optimizing
adsorption
strength
N-intermediates,
resulting
greatly
enhanced
reaction
performance.
synthesized
Ru-doped
rod
array
electrode
delivers
rate
1.31
mmol
h–1
cm–2
efficiency
91.5%
at
−0.6
V
versus
reversible
hydrogen
electrode,
as
well
good
cycling
stability.
In
view
multielectron
transfer
electrocatalytic
activity,
Zn-NO3–
battery
assembled
this
Zn
anode,
which
high
open-circuit
voltage
1.421
maximum
output
power
density
4.99
mW
cm–2,
demonstrating
potential
application
value.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(27)
Published: April 19, 2024
Abstract
Spinel
oxides
with
tunable
chemical
compositions
have
emerged
as
versatile
electrocatalysts,
however
their
performance
is
greatly
limited
by
small
surface
area
and
low
electron
conductivity.
Here,
ultrathin
high‐entropy
Fe‐based
spinel
nanosheets
are
rationally
designed
(i.e.,
(Co
0.2
Ni
Zn
Mg
Cu
)Fe
2
O
4
;
denotes
A
5
Fe
)
in
thickness
of
≈4.3
nm
large
highly
exposed
active
sites
via
a
modified
sol–gel
method.
Theoretic
experimental
results
confirm
that
the
bandgap
significantly
smaller
than
ordinary
oxides,
realizing
transformation
binary
oxide
from
semiconductors
to
metalloids.
As
result,
such
manifest
excellent
for
nitrate
reduction
reaction
(NO
3
−
RR)
ammonia
(NH
),
NH
yield
rate
≈2.1
mmol
h
−1
cm
−2
at
−0.5
V
versus
Reversible
hydrogen
electrode,
outperforming
other
spinel‐based
electrocatalysts.
Systematic
mechanism
investigations
reveal
NO
RR
mainly
occurred
on
sites,
introducing
tetrahedral
regulates
adsorption
strength
N
O‐related
intermediates
boosting
RR.
The
above
findings
offer
platform
regulate
enhance
electrocatalytic
oxides.
Science China Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: April 30, 2024
Electrocatalytic
reduction
of
nitrate
(NO3−)
can
efficiently
transform
NO3−
into
ammonia
(NH3),
enabling
the
simultaneous
removal
pollutant
from
wastewater
and
production
NH3.
Here,
we
report
use
rare-earth
lanthanum-doped
Co3O4
nanowires
array
on
carbon
cloth
(La-Co3O4/CC)
as
an
efficient
electrocatalyst
for
conversion
to
The
as-synthesized
La-Co3O4/CC
demonstrates
a
remarkable
NH3
Faradaic
efficiency
(96.36%)
yield
(537.44
µmol
h−1
cm−2),
markedly
surpassing
its
counterpart
(87.78%,
279.4
cm−2).
Theoretical
computations
unveil
that
incorporation
La
doping
promotes
adsorption
optimizes
hydrogenation
process,
thus
enhancing
electroreduction
activity
in
selectivity.
Furthermore,
Zn–NO3−
battery
incorporating
achieved
peak
power
density
9.86
mW
cm−2.
This
work
advances
application
Co3O4-based
electrodes
electrocatalysis
highlights
effectiveness
rare
earth
element
reactions.
