Nanomaterials,
Год журнала:
2024,
Номер
14(23), С. 1907 - 1907
Опубликована: Ноя. 27, 2024
In
recent
years,
the
development
of
high-performance
electrocatalysts
for
energy
conversion
and
environmental
remediation
has
become
a
topic
great
interest.
Covalent
organic
frameworks
(COFs),
linked
by
covalent
bonds,
have
emerged
as
promising
materials
in
field
electrocatalysis
due
to
their
well-defined
structures,
high
specific
surface
areas,
tunable
pore
excellent
acid-base
stability.
However,
low
conductivity
COF
often
limits
intrinsic
electrocatalytic
activity.
To
enhance
catalytic
performance
COF-based
catalysts,
various
nanomaterials
are
integrated
into
COFs
form
composite
catalysts.
The
stable
porous
structure
provides
an
ideal
platform
these
nanomaterials,
leading
improved
Through
rational
design,
can
achieve
synergistic
effects
between
carrier,
enabling
efficient
targeted
electrocatalysis.
This
review
summarizes
applications
nanomaterial-incorporated
catalysts
hydrogen
evolution,
oxygen
reduction,
carbon
dioxide
nitrogen
reduction.
Additionally,
it
outlines
design
principles
electrocatalysis,
focusing
on
structure-activity
relationships
nanomaterial
electrocatalysts,
well
challenges
future
perspectives
next-generation
electrocatalysts.
Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 29, 2024
Abstract
Zn‐Co/air
hybrid
batteries
showcase
enhanced
energy
efficiency,
power
density,
and
stability
compared
to
Zn‐air
batteries.
Nevertheless,
it
remains
challenging
fabricate
multi‐functional
cathode
materials
with
fast
reaction
kinetics.
Herein
the
synthesis
of
a
wheat‐like
composed
“cereal‐grains”
densely
arranged
Co/Co
2
P
heterostructures
grown
on
“central
stems”
P/N
codoped
carbon
nanofibers
(denoted
as
P@PNCF)
is
presented.
The
biomimetic
nanostructures
not
only
offer
abundant
exposed
active
sites
maximize
accessibility
but
also
establish
efficient
multi‐channel
networks
for
both
electron
transfer
O
/OH
−
diffusion.
Furthermore,
species
high‐valent
Co,
resulting
from
self‐reconstruction
heterojunction
during
first
cycle,
create
Co
2+
↔
4+
redox
pairs
provide
additional
charging‐discharging
voltage
plateaus.
In
situ
Raman
spectroscopy
measurement
combined
ex
X‐ray
diffraction
evidence
supports
reversible
process
3+/4+
x
(OH)
y
K
2+/3+
,
leading
improved
efficiency
durability
battery.
As
result,
battery
based
P@PNCF
exhibits
remarkable
density
(321
mW
cm
−2
),
ultralong
cycle
(700
h),
large
(62%
at
20
mA
).
The
development
of
efficient
and
stable
electrocatalysts
for
the
hydrogen
evolution
reaction
(HER)
is
essential
realization
effective
production
via
seawater
electrolysis.
Herein,
study
has
developed
a
simple
method
that
combines
electrospinning
with
subsequent
thermal
shock
technology
to
effectively
disperse
ruthenium
nanoparticles
onto
highly
conductive
titanium
carbide
nanofibers
(Ru@TiC).
electronic
metal-support
interactions
(EMSI)
resulted
from
charge
redistribution
at
interface
between
Ru
TiC
support
can
optimize
desorption
kinetics
sites
induce
spillover
phenomenon,
thereby
improving
evolution.
As
result,
Ru@TiC
catalyst
exhibits
outstanding
HER
activity,
requiring
low
overpotentials
only
65
mV
in
alkaline
current
density
100
mA
cm-2.
Meanwhile,
demonstrates
excellent
stability,
maintaining
consistent
operation
500
cm-2
least
250
hours.
Additionally,
an
anion
exchange
membrane
electrolyzer
incorporating
operated
continuously
over
hours
200
seawater.
This
highlights
significant
potential
robust
supports
fabrication
enduring
enhance
complex
environments.
Inorganic Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 23, 2025
Promoting
the
rate
of
oxygen
reduction
reaction
(ORR)
is
critical
for
boosting
overall
energy
efficiency
flexible
zinc–air
batteries
(FZABs).
Inspired
by
nature,
we
designed
"branch-leaf"
like
hierarchical
porous
carbon
nanofibers
with
ultralow
loadings
Ir
nanoparticles
(NPs)
derived
from
covalent–organic
framework/metal–organic
framework
(COF/MOF)
core–shell
hybrids.
The
as-obtained
Ir/FeZn-hierarchical
(HPCNFs)
showcase
enhanced
ORR
performance,
and
loading
reduces
cost
while
maintaining
catalytic
capacity.
Interestingly,
FZABs
assembled
Ir/FeZn-HPCNFs
deliver
an
impressive
stable
performance.
This
work
provides
a
feasible
approach
designing
cost-effective
highly
efficient
electrocatalysts
using
in
FZABs.
