Chemical Communications,
Год журнала:
2024,
Номер
unknown
Опубликована: Янв. 1, 2024
A
nanoflower-like
MoO
2
–Rh
electrocatalyst
exhibits
a
3.5-fold
higher
mass
activity
in
the
hydrazine
oxidation
reaction
compared
with
Rh,
attributed
to
hydrogen
spillover,
acting
as
pump
deplete
from
Rh
active
site.
Chemical Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
FeCoNiIrPtPd/NCNT
exhibits
3.4-
and
1.6-fold
higher
levels
of
mass
activity
than
does
commercial
Pt/C
in
the
hydrogen
evolution
reaction
(HER)
ethanol
oxidation
(EOR),
respectively.
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 4, 2024
Abstract
High‐performance
bifunctional
electrocatalyst
for
oxygen
evolution
reaction
(OER)
and
reduction
(ORR)
is
the
keystone
industrialization
of
rechargeable
zinc‐air
battery
(ZAB).
In
this
work,
modulation
in
spin
state
Fe
single
atom
on
nitrogen
doped
carbon
(Fe
1
‐NC)
devised
by
Co
3
O
4
(Co
@Fe
‐NC),
a
mediate
recorded.
Besides,
d
band
center
downshifted
associated
with
increment
e
g
filling
revealing
weakened
interaction
OH
*
moiety,
resulting
boosted
ORR
performance.
The
kinetic
current
density
‐NC
2.0‐
5.6
times
higher
than
commercial
Pt/C,
respectively.
Moreover,
high
found
contributing
to
accelerated
surface
reconstruction
witnessed
operando
Raman
electrochemical
impedance
spectroscopies.
A
robust
OER
activity
overpotential
352
mV
at
50
mA
cm
−2
achieved,
decreased
18
60
comparison
@NC
IrO
2
.
reveals
balanced
adsorption
species
its
deprotonation
leading
stability.
ZAB
performance
193.2
mW
maintains
200
h.
Furthermore,
all‐solid‐state
shows
promising
163.1
The
lattice
oxygen
mechanism
(LOM)
plays
a
critical
role
in
the
acidic
evolution
reaction
(OER)
as
it
provides
more
efficient
catalytic
pathway
compared
to
conventional
adsorption
(AEM).
LOM
effectively
lowers
energy
threshold
of
and
accelerates
rate
by
exciting
atoms
catalyst
directly
participate
OER
process.
In
recent
years,
with
increase
in-depth
understanding
LOM,
researchers
have
developed
variety
iridium
(Ir)
ruthenium
(Ru)-based
catalysts,
well
non-precious
metal
oxide
optimized
their
performance
through
different
strategies.
However,
still
faces
many
challenges
practical
applications,
including
long-term
stability
precise
modulation
active
sites,
application
efficiency
real
electrolysis
systems.
Here,
we
review
OER,
analyze
its
difference
traditional
AEM
new
(OPM)
mechanism,
discuss
experimental
theoretical
validation
methods
pathway,
prospect
future
development
electrocatalyst
design
conversion,
aiming
provide
fresh
perspectives
strategies
for
solving
current
challenges.
Utilizing
affordable
bifunctional
catalysts
per
strong
ORR/OER
(oxygen
reduction
and
evolution
reactions)
ability
superior
zinc-air
battery
performance
is
yet
difficult
due
to
the
diverse
mechanisms
of
ORR/OER.
This
work
uses
CoNi-MOF
(metal-organic
framework)
as
a
self-template
yield
CrS
doped
CoNi/C
catalyst.
Comparable
Pt/C
IrO2
commercial
catalysts,
CrS@CoNi/C
catalyst
exhibits
improved
electrocatalytic
activity
toward
OER
ORR
its
linked
pellet
architecture
intact
metal
sulfide@carbon
structure.
The
has
most
intriguing
performance,
with
significantly
lower
potential
an
exceptionally
extended
cycle
duration
(E1/2
=
0.72
V
η10
260
mV).
CrS@CoNi/C-based
aqueous
shows
long-term
charge-discharge
stability
(more
than
100h/600
cycles)
together
significant
specific
capacity
(789.7
mAh
g-1
Zn)
power
density
(132.2
mW
cm-2).
Most
significantly,
after
stability,
recharged
alkaline
been
employed
exhibit
less
structural
deformation
for
cathode
more
zincate
ion
production
anode
side
electrodes,
which
through
TEM
analysis.
Abstract
The
utilization
of
single
atoms
(SAs)
as
trifunctional
electrocatalyst
for
nitrogen
reduction,
oxygen
and
evolution
reactions
(NRR,
ORR,
OER)
is
still
a
formidable
challenge.
Herein,
we
devise
one‐pot
synthesized
palladium
SAs
stabilized
on
nitrogen‐doped
carbon
SA
(Pd‐SA/NC)
efficient
NRR,
OER.
Pd‐SA/NC
performs
robust
catalytic
activity
toward
NRR
with
faradaic
efficiency
22.5%
at
−0.25
V
versus
reversible
hydrogen
electrode
(RHE),
the
relative
Pd
enhanced
by
17‐fold
than
Pd‐NP/NC.
In
addition,
half‐wave
potential
reaches
0.876
RHE,
amounting
to
58‐time
higher
mass
commercial
Pt/C.
Moreover,
overpotential
10
mA
cm
−2
low
287
mV
Pd‐SA/NC,
outperforming
IrO
2
360
times
in
turnover
frequency
1.6
RHE.
Accordingly,
assembled
rechargeable
zinc‐air
battery
(ZAB)
achieves
maximum
power
density
170
mW
,
boosted
2.3
Pt/C–IrO
.
Two
constructed
ZABs
efficiently
NRR‐OER
system
electrochemically
generate
ammonia
implying
its
superior
trifunctionality.