Rational
construction
of
efficient
and
robust
bifunctional
oxygen
electrocatalysts
is
key
but
challenging
for
the
widespread
application
rechargeable
zinc-air
batteries
(ZABs).
Herein,
ligand
Co
metal-organic
frameworks
were
explored
to
fabricate
a
hybrid
heterostructured
CoOx/Co
nanoparticles
anchored
on
carbon
substrate
rich
in
CoNx
sites
(CoOx/Co@Co-N-C)
via
one-step
pyrolysis
method.
Such
unique
heterostructure
provides
abundant
active
drive
reduction
reaction
(ORR)
evolution
(OER),
respectively.
Besides,
their
positive
synergies
facilitate
electron
transfer
optimize
charge/mass
transportation.
Consequently,
obtained
CoOx/Co@Co-N-C
exhibits
superior
ORR
activity
with
higher
half-wave
potential
0.88
V
than
Pt/C
(0.83
V),
together
comparable
OER
performance
an
overpotential
346
mV
at
10
mA
cm-2
commercial
RuO2.
The
assembled
ZAB
using
as
cathode
catalyst
displays
maximum
power
density
168.4
mW
cm-2,
excellent
charge-discharge
cyclability
over
250
h
5
cm-2.
This
work
highlights
heterostructures
electrocatalysis
new
pathway
designing
catalysts
toward
ZABs.
Advanced Energy Materials,
Год журнала:
2022,
Номер
13(1)
Опубликована: Ноя. 6, 2022
Abstract
The
strategy
of
heteroatom
doping
and
metal
active
sites
can
synergistically
promote
oxygen
electrocatalysis.
Especially,
the
combination
theoretical
simulations
with
experimental
results
provides
new
opportunities
to
understand
electrocatalytic
mechanism.
Herein,
3D
carbon
nanosheets
aggregate
highly
branched
nanotubes
cobalt
(CoCNTs/PNAs)
is
prepared
via
facile
self‐assembly‐pyrolysis
strategy.
CoCNTs/PNAs
electrocatalysts
exhibit
superior
bifunctional
activities
reduction
(
E
1/2
=
0.925
V)
evolution
j
10
1.54
reactions,
surpassing
those
Pt/C‐RuO
2
catalysts.
calculations
reveal
that
electronic
interaction
nitrogen‐doped
matrix
plays
a
critical
role
in
boosting
performance.
Additionally,
rechargeable
Zn‐Air
battery
(ZAB)
assembled
aqueous
electrolyte
exhibits
largest
power
density
371.6
mW
cm
−2
outstanding
cycling
durability
(over
2000
h).
Furthermore,
all‐solid‐state
cable‐type
ZAB
delivers
high
flexibility
good
stability
energy
efficiency
(76.5%).
This
work
will
open
avenue
adjust
metal‐carbon
support
for
functional
electrocatalysis
hierarchical
porous
structure
design.
Deleted Journal,
Год журнала:
2022,
Номер
2, С. e9120039 - e9120039
Опубликована: Ноя. 8, 2022
Zn-based
batteries
have
attracted
extensive
attention
due
to
their
high
theoretical
energy
density,
safety,
abundant
resources,
environmental
friendliness,
and
low
cost.
They
are
a
new
storage
conversion
technology
with
significant
development
potential
been
widely
used
in
renewable
portable
electronic
devices.
Considerable
attempts
devoted
improving
the
performance
of
batteries.
Specifically,
battery
cycle
life
efficiency
can
be
improved
by
electrolyte
modification
construction
highly
efficient
rechargeable
Zn
anodes.
This
review
compiles
progress
research
related
anodes
electrolytes,
especially
last
five
years.
will
introduce
fundamental
concepts,
summarize
recent
development,
inspire
further
systematic
for
high-performance
future.
RSC Advances,
Год журнала:
2023,
Номер
13(13), С. 8736 - 8742
Опубликована: Янв. 1, 2023
It
is
common
knowledge
that
the
O2
evolution
reaction
(OER)
a
crucial
half-reaction
in
electrolysis
of
water.
However,
it
currently
difficult
to
create
inexpensive
OER
electrode
materials
way
efficient,
simple,
and
environmentally
friendly.
In
this
research,
metal
oxy-hydroxides
with
numerous
oxygen
defects
(M-OOHv)
are
created
at
surface
Cu
foam
(CF)
using
unique,
straightforward
electro-oxidation
reconstitution
(ER)
process.
Different
spectroscopic
microscopy
methods
used
analyse
characteristics
Al2Cu-MOF@M-OOHv-ER/CF;
electrochemical
measurements
display
lower
overpotential
(η)
366
mV
@
10
mA
cm-2
Tafel
slope
95.2
dec-1
1.0
M
KOH.
X-Ray
diffraction
(XRD),
scanning
electron
(SEM),
Raman
studies
confirm
phase
transition
metal-organic
framework
(MOF)
M-OOH,
which
acts
as
active
site
boost
activity.
Through
microscopic
investigations,
determined
efficiency
bimetallic
vacancies
M-OOHv
have
an
impact
on
power
density.
The
manufactured
material
additionally
showed
good
durability
for
50
hours.
As
result,
newly
developed
Al2Cu-MOF@M-OOHv-ER/CF
nanomaterial
has
greater
potential
both
water
other
energy
storage
equipment.
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(14), С. 4847 - 4870
Опубликована: Янв. 1, 2024
Based
on
the
advancements
in
atomically
dispersed
multi-site
catalysts
for
FZABs,
this
review
discusses
design
methodologies
to
regulate
performance
of
bifunctional
oxygen
electrocatalysts
from
electronic
and
geometric
structures.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(23), С. 29979 - 29990
Опубликована: Май 30, 2024
Development
of
cheap,
highly
active,
and
durable
nonprecious
metal-based
oxygen
electrocatalysts
is
essential
for
metal–air
battery
technology,
but
achieving
the
balance
evolution
reaction
(OER)/oxygen
reduction
(ORR)
bifunctional
performance
long-term
durability
still
a
great
challenge.
Using
typical
Co–N–C
catalyst
as
model,
herein,
we
introduced
ammonium
chloride
into
nitrogen-doped
carbon
materials
containing
metal
elements
during
pyrolysis
process
(Co–N–C/AC),
which
not
only
increases
active
area
also
realizes
accurate
customization
site
(pyridine
nitrogen
cobalt
oxide
species)
so
to
achieve
OER/ORR
sites.
The
synthesized
Co–N–C/AC
with
three-dimensional
porous
structure
exhibits
smaller
potential
gap
0.72
V.
peak
power
density
aqueous
cell
at
current
308
mA
cm–2
203
mW
cm–2.
cycle
life
(≈3900
h)
longer
than
those
other
recently
reported
Zn–air
batteries
(ZABs).
Co–N–C/AC-based
quasi-solid-state
ZAB
reaches
550
∼72
h.
This
work
shows
feasible
path
practical
application
ZABs
by
balancing
tailoring
reasonably.
