Small,
Journal Year:
2023,
Volume and Issue:
20(3)
Published: Sept. 10, 2023
Abstract
The
development
of
efficient
and
low‐cost
catalysts
for
cathodic
oxygen
reduction
reaction
(ORR)
in
Zn‐air
battery
(ZAB)
is
a
key
factor
reducing
costs
achieving
industrialization.
Here,
novel
segregated
CoNiPt
alloy
embedded
N‐doped
porous
carbon
with
nanoflowers
(NFs)‐like
hierarchy
structure
synthesized
through
pyrolyzing
Hofmann‐type
metal‐organic
frameworks
(MOFs).
unique
hierarchical
NFs
exposes
more
active
sites
facilitates
the
transportation
intermediates,
thus
accelerating
kinetics.
Impressively,
resulting
15%
CoNiPt@C
catalyst
exhibits
outstanding
alkaline
ORR
activity
half‐wave
potential
0.93
V,
its
mass
7.5
times
higher
than
that
commercial
Pt/C
catalyst,
surpassing
state‐of‐the‐art
noble
metal‐based
catalysts.
Furthermore,
assembled
CoNiPt@C+RuO2
ZAB
demonstrates
maximum
power
density
172
mW
cm
−2
,
which
superior
to
Pt/C+RuO2
ZAB.
Experimental
results
reveal
intrinsic
attributed
synergistic
interaction
between
defects
pyrrolic/graphitic
N
species,
optimizes
adsorption
energy
intermediate
species
process
greatly
enhances
catalytic
activity.
This
work
provides
practical
feasible
strategy
synthesizing
cost‐effective
by
optimizing
electronic
MOF‐derived
Small,
Journal Year:
2021,
Volume and Issue:
17(42)
Published: Sept. 15, 2021
Abstract
Aqueous
Zn‐ion
batteries
own
great
potential
on
next
generation
wearable
due
to
the
high
safety
and
low
cost.
However,
uncontrollable
dendrites
growth
negligible
subzero
temperature
performance
impede
practical
applications.
Herein,
it
is
demonstrated
that
dimethyl
sulfoxide
(DMSO)
an
effective
additive
in
ZnSO
4
electrolyte
for
side
reactions
suppression
by
regulating
solvation
structure
inducing
Zn
2+
form
more
electrochemical
stable
(002)
basal
plane,
via
higher
absorption
energy
of
DMSO
with
plane.
Moreover,
reconstructed
hydrogen
bonds
between
H
2
O
dramatically
lower
freezing
point
electrolyte,
which
significantly
increases
ionic
conductivity
cycling
aqueous
at
temperatures.
As
a
consequence,
symmetrical
Zn/Zn
cell
can
be
kept
than
2100
h
20
°C
1200
−20
without
dendrite
by‐products
formation.
The
Zn/MnO
perform
steadily
3000
cycles
300
°C.
This
work
provides
facile
feasible
strategy
designing
free
various
ACS Energy Letters,
Journal Year:
2021,
Volume and Issue:
6(10), P. 3624 - 3633
Published: Sept. 21, 2021
Low-cost
and
efficient
oxygen
reduction
reaction
(ORR)/oxygen
evolution
(OER)
bifunctional
electrocatalysts
are
vital
for
the
applications
of
rechargeable
Zn–air
batteries
(ZABs).
Given
high
catalytic
activity
single-atom
catalysts
(SACs),
preparing
SACs
on
a
large
scale
ZABs
is
desirable
but
remains
challenging.
Herein,
in
situ
formation
Fe–N–C
plate
wood-based
porous
carbon
achieved
via
facile
Lewis
acid
pretreatment
carbonization
process.
FeCl3
cell
wall
wood
not
only
produces
abundant
microchannels
also
successfully
introduces
atomically
dispersed
Fe–N
active
species
into
hierarchical
structure.
Such
uniformly
dispersive
structure
enhance
ORR/OER
performance
durability.
A
ZAB
using
catalyst
cathode
shows
power
density
(70.2
mW
cm–2,
at
quasi
solid
state)
long-term
stability.
This
work
provides
new
path
large-scale
preparation
high-performance
SACs.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
33(41)
Published: July 28, 2023
Abstract
Constructing
an
efficient
alkaline
hydrogen
evolution
reaction
(HER)
catalyst
with
low
platinum
(Pt)
consumption
is
crucial
for
the
cost
reduction
of
energy
devices,
such
as
electrolyzers.
Herein,
nanoflower‐like
carbon‐encapsulated
CoNiPt
alloy
catalysts
composition
segregation
are
designed
by
pyrolyzing
morphology‐controlled
and
Pt‐proportion‐tuned
metal–organic
frameworks
(MOFs).
The
optimized
containing
15%
NFs
(15%:
Pt
mass
percentage,
NFs:
nanoflowers)
exhibits
outstanding
HER
performance
a
overpotential
25
mV
at
current
density
10
mA
cm
−2
,
far
outperforming
those
commercial
Pt/C
(47
mV)
most
advanced
catalysts.
Such
superior
activity
originates
from
integration
Co‐O
hybridization.
hierarchical
structure
guarantees
full
exposure
sites.
Density
functional
theory
calculations
suggest
that
components
not
only
promote
water
dissociation
but
also
facilitate
adsorption
process,
synergistically
accelerating
kinetics
HER.
In
addition,
volcanically
distributed
surface
oxygen
content,
mainly
in
form
Co
3d
O
2p
hybridization,
which
another
reason
enhanced
activity.
This
work
provides
feasible
insights
into
design
cost‐effective
coordinating
kinetic
sites
adjusting
appropriate
content.
Chemical Reviews,
Journal Year:
2023,
Volume and Issue:
123(13), P. 8859 - 8941
Published: June 26, 2023
Amorphous
materials
are
metastable
solids
with
only
short-range
order
at
the
atomic
scale,
which
results
from
local
intermolecular
chemical
bonding.
The
lack
of
long-range
typical
crystals
endows
amorphous
nanomaterials
unconventional
and
intriguing
structural
features,
such
as
isotropic
environments,
abundant
surface
dangling
bonds,
highly
unsaturated
coordination,
etc.
Because
these
features
ensuing
modulation
in
electronic
properties,
display
potential
for
practical
applications
different
areas.
Motivated
by
elements,
here
we
provide
an
overview
unique
general
synthetic
methods,
covered
contemporary
research
nanomaterials.
Furthermore,
discussed
possible
theoretical
mechanism
nanomaterials,
examining
how
properties
configurations
contribute
to
their
exceptional
performance.
In
particular,
benefits
well
enhanced
electrocatalytic,
optical,
mechanical
thereby
clarifying
structure–function
relationships,
highlighted.
Finally,
a
perspective
on
preparation
utilization
establish
mature
systems
superior
hierarchy
various
is
introduced,
outlook
future
challenges
opportunities
frontiers
this
rapidly
advancing
field
proposed.
Nano-Micro Letters,
Journal Year:
2021,
Volume and Issue:
13(1)
Published: Aug. 13, 2021
Recent
years
have
witnessed
a
booming
interest
in
grid-scale
electrochemical
energy
storage,
where
much
attention
has
been
paid
to
the
aqueous
zinc
ion
batteries
(AZIBs).
Among
various
cathode
materials
for
AZIBs,
manganese
oxides
risen
prominence
due
their
high
density
and
low
cost.
However,
sluggish
reaction
kinetics
poor
cycling
stability
dictate
against
practical
application.
Herein,
we
demonstrate
combined
use
of
defect
engineering
interfacial
optimization
that
can
simultaneously
promote
rate
capability
MnO2
cathodes.
β-MnO2
with
abundant
oxygen
vacancies
(VO)
graphene
oxide
(GO)
wrapping
is
synthesized,
which
VO
bulk
accelerate
charge/discharge
while
GO
on
surfaces
inhibits
Mn
dissolution.
This
electrode
shows
sustained
reversible
capacity
~
129.6
mAh
g-1
even
after
2000
cycles
at
current
4C,
outperforming
state-of-the-art
MnO2-based
The
superior
performance
be
rationalized
by
direct
interaction
between
surface
coating
layer,
as
well
regulation
structural
evolution
during
cycling.
combinatorial
design
scheme
this
work
offers
pathway
obtaining
high-rate
long-life
cathodes
AZIBs.
