ChemSusChem,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 19, 2024
Abstract
Electrochemical
nitrate
reduction
to
ammonia
(NRA)
is
a
promising
approach
remove
environmental
pollutants
while
producing
green
NH
3
under
ambient
conditions.
Ag‐based
nanomaterials
have
been
used
in
NRA
but
their
iron
series
elements
(Fe,
Co,
Ni)
doping
has
not
explored
yet.
Herein,
an
effective
and
versatile
strategy
of
Ag
nanocrystals
by
for
efficient
presented.
Experimental
results
show
that
with
Fe,
Co
or
Ni
can
improve
the
activity.
Among
catalysts,
AgCo
delivers
best
performance
Faraday
efficiency
(FE)
88.3
%
selectivity
97.4
at−0.23
V
vs
RHE,
which
1.9
6.2
times
higher
than
plain
(46.4
FE
15.8
selectivity),
respectively.
A
highest
NO
−
conversion
rate
(91.8
%)
achieved,
maintains
16.4
ppm
−−
N
4
hours,
meeting
drinking
water
level
(~15
−N).
Moreover,
FE,
selectivity,
do
decay
after
four
consecutive
cycles.
It
found
effectively
induce
change
d‐band
center
optimized
NRA.
This
work
reveals
effects
on
shows
potential
practical
application
Inorganic Chemistry Frontiers,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
CoWO
4
nanoarrays
on
Ni
foam
can
serve
as
an
efficient
electrocatalyst
for
the
selective
reduction
of
NO
2
−
to
NH
3
in
neutral
solution,
achieving
production
rate
18.856
mg
h
−1
cm
−2
and
a
faradaic
efficiency
95.2%
at
−0.7
V.
Electrochemical
nitrite
(NO2–)
is
a
promising
technology
for
NO2–
removal
and
sustainable
method
generating
valuable
ammonia
(NH3),
but
this
process
intricate
generates
other
byproducts.
In
work,
we
propose
facile
low-cost
the
preparation
of
Cu3Mo2O9
nanosheet
array,
which
can
serve
as
an
efficient
electrocatalyst
reduction
to
NH3.
The
morphology
be
adjusted
by
controlling
synthesis
conditions.
neutral
solution,
achieves
high
NH3
yield
30.46
mg
h–1
cm–2
outstanding
faradaic
efficiency
98.6%
with
excellent
long-term
electrochemical
stability
reduction.
Density
functional
theory
calculations
further
reveal
key
role
(202)
surface
its
possible
reaction
pathways
in
electrocatalytic
nitrite.
Electrochemical
nitrite
(NO2–)
reduction
provides
an
alternative
pathway
for
both
sustainable
ammonia
(NH3)
synthesis
and
reutilization
of
NO2–
pollutants,
but
this
process
requires
high
activity
selective
catalysts.
In
work,
cobalt
nanoparticles
encapsulated
in
N-doped
carbon
nanotubes
supported
on
cloth
(Co@NCNT/CC)
as
a
low-cost
electrocatalyst
can
efficiently
catalyze
NO2–-to-NH3
conversion.
Such
Co@NCNT/CC
shows
exceptional
electrocatalytic
performance,
achieving
maximum
NH3
Faradaic
efficiency
94.9%
with
yield
365.1
μmol
h–1
cm–2
at
−0.3
V.
Remarkably,
the
assembled
Zn–NO2–
battery
cathode
exhibits
peak
power
density
4.4
mW
satisfactory
141.5
cm–2.
