Advanced Functional Materials,
Год журнала:
2024,
Номер
34(32)
Опубликована: Апрель 25, 2024
Abstract
Transition
metal‐nitrogen‐carbon
single‐atom
catalysts
(M─N─C
SACs)
exhibit
outstanding
catalytic
activity
for
the
oxygen
reduction
reaction
(ORR).
However,
these
still
face
dual
challenges
of
low
density
and
utilization
active
sites
in
practical
applications.
Hence,
a
simultaneous
modulation
strategy
to
construct
high‐density
accessible
Co‐N
4
on
nitrogen‐doped
porous
carbon
(Co
H
SA/NC),
is
reported.
As
expected,
optimized
Co
SA/NC
catalyst
exhibits
superior
ORR
with
half‐wave
potential
value
0.874
V,
outperforming
that
benchmark
Pt/C
catalyst.
Importantly,
mass
turnover
frequency
are
14.7
13.3
times
higher
than
low‐density
single
atom
L
respectively.
Structural
characterization
functional
theory
(DFT)
reveal
structure
high
dense
synergistically
improve
performance,
which
induced
redistribution
d
orbital,
resulting
z
2
orbital
has
enough
electron
interact
OOH
*
specie,
thereby
facilitating
kinetic
process
ORR.
Moreover,
SA/NC‐based
Zn–Air
Battery
(ZAB)
also
showed
excellent
device
including
high‐power
(191.7
mW
cm
−2
),
specific
capacity,
stability
(250
h),
significantly
Pt/C‐based
ZABs.
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.
Green Carbon,
Год журнала:
2024,
Номер
2(2), С. 221 - 230
Опубликована: Апрель 1, 2024
The
rational
design
of
Fe-N-C
catalysts
that
possess
easily
accessible
active
sites
and
favorable
mass
transfer,
which
are
usually
determined
by
the
structure
catalyst
supports,
is
crucial
for
oxygen
reduction
reaction
(ORR).
In
this
study,
an
oleic
acid-assisted
soft-templating
approach
developed
to
synthesize
size-controlled
nitrogen-doped
carbon
nanoparticles
(ranging
from
130
nm
60
35
nm,
respectively)
feature
spiral
mesopores
on
their
surface
(SMCs).
Next,
atomically
dispersed
Fe-Nx
fabricated
size-tunable
SMCs
(Fe1/SMC-x,
where
x
represents
SMC
size)
size-dependent
activity
toward
ORR
investigated.
It
found
catalytic
performance
Fe1/SMCs
significantly
influenced
size
SMCs,
Fe1/SMC-60
shows
highest
with
a
half-wave
potential
0.90
V
vs.
RHE
in
KOH
electrolyte,
indicating
gas-liquid-solid
three-phase
interface
enhances
accessibility
sites.
addition,
when
using
as
cathode
aqueous
zinc-air
batteries
(ZABs),
it
delivers
higher
open-circuit
voltage
(1.514
V),
greater
power
density
(223
mW
cm-2),
larger
specific
capacity/energy
than
Pt/C-based
counterparts.
These
results
further
highlight
practical
energy
devices
associated
importance
synthesis
SMCs.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(32)
Опубликована: Апрель 25, 2024
Abstract
Transition
metal‐nitrogen‐carbon
single‐atom
catalysts
(M─N─C
SACs)
exhibit
outstanding
catalytic
activity
for
the
oxygen
reduction
reaction
(ORR).
However,
these
still
face
dual
challenges
of
low
density
and
utilization
active
sites
in
practical
applications.
Hence,
a
simultaneous
modulation
strategy
to
construct
high‐density
accessible
Co‐N
4
on
nitrogen‐doped
porous
carbon
(Co
H
SA/NC),
is
reported.
As
expected,
optimized
Co
SA/NC
catalyst
exhibits
superior
ORR
with
half‐wave
potential
value
0.874
V,
outperforming
that
benchmark
Pt/C
catalyst.
Importantly,
mass
turnover
frequency
are
14.7
13.3
times
higher
than
low‐density
single
atom
L
respectively.
Structural
characterization
functional
theory
(DFT)
reveal
structure
high
dense
synergistically
improve
performance,
which
induced
redistribution
d
orbital,
resulting
z
2
orbital
has
enough
electron
interact
OOH
*
specie,
thereby
facilitating
kinetic
process
ORR.
Moreover,
SA/NC‐based
Zn–Air
Battery
(ZAB)
also
showed
excellent
device
including
high‐power
(191.7
mW
cm
−2
),
specific
capacity,
stability
(250
h),
significantly
Pt/C‐based
ZABs.
