Nano Materials Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Май 1, 2024
The
Fe–N–C
catalysts
with
atomic
Fe1
active
sites
are
the
most
low-cost
alternatives
to
Pt/C
for
large-scale
application
of
proton
exchange
membrane
fuel
cells
(PEMFCs).
However,
activity
performance
still
lags
behind
that
Pt
catalysts,
especially
in
PEMFC
devices.
This
review
focuses
on
three
key
factors
affecting
and
advanced
synthesis
strategies
high-performance
Fe–N–C.
Based
literature
data,
we
have
summarized
relationship
between
catalyst
iron
content
effective
site
concentration,
pointed
out
current
difficulties
encountered
design,
proposed
several
aspects
future
research
needs
focus
on.
We
believe
this
could
guide
rational
design
type
single-atom
promote
development
PEMFCs.
Green Processing and Synthesis,
Год журнала:
2025,
Номер
14(1)
Опубликована: Янв. 1, 2025
Abstract
Rare-earth
diatomic
catalysts
(DACs)
not
only
encompass
the
advantages
characteristic
of
single-atom
(SACs),
but
also
exhibit
capability
to
surpass
catalytic
activity
achieved
by
single-metal
SACs.
Nevertheless,
DACs
are
predominantly
engineered
using
transition
elements,
with
limited
exploration
focusing
on
rare-earth
elements.
Herein,
we
report
a
Ni–Y
porous
carbon
electrocatalyst
synthesized
an
organic
ligand
strategy,
which
exhibits
excellent
performance
in
electrochemical
CO
2
reduction
reaction
high
selectivity
for
CO.
Operating
at
modest
potential
−0.93
V
compared
reversible
hydrogen
electrode,
DAC,
enhanced
presence
element
Y,
achieves
remarkable
Faraday
efficiency
89%
and
attains
impressive
current
density
12
mA·cm
−2
.
The
incorporation
Y
facilitates
modulation
electron
pertaining
Ni
constituent,
thereby
refining
configuration
within
substrate
eliciting
augmentation
electrocatalytic
efficacy
material.
Abstract
Atomically
dispersed
dual‐metal
sites
catalysts,
also
named
as
dual‐atom
have
become
a
frontier,
since
they
combine
the
merits
of
homogeneous
and
heterogeneous
catalysts
to
satisfy
demands
for
critical
catalytic
reactions
in
green
energy
industrial
equipment.
However,
absence
further
understanding
evolution
catalyst
structures
reaction
environments
results
significant
gap
between
theoretical
experimental.
Here,
we
provide
model
understand
active
configuration
acidic
oxygen
reduction
propose
an
environmental
corrected
descriptor
(Δξ)
based
on
d
‐orbital
spin
states
reveal
activity
control
mechanism.
Taking
ORR
example,
Δξ
correlated
well
with
overpotential
(
R
2
=
0.96),
which
is
determined
by
number
electron
occupancies
z
orbital
F
dz
).
Accordingly,
this
work
provides
new
insights
into
design
environments.
Chemistry - A European Journal,
Год журнала:
2024,
Номер
30(61)
Опубликована: Авг. 23, 2024
Abstract
The
utilization
of
catalysts
comprising
metal
nanoparticle
has
been
beneficial
for
enhancing
the
performance
oxygen
reduction
reaction
(ORR).
However,
inadequate
intrinsic
activity
these
still
presents
a
significant
challenge,
limiting
their
overall
effectiveness.
This
issue
can
be
addressed
by
introducing
single
atoms,
which
create
synergistic
effect
with
nanoparticles
to
catalyse
and
thereby
improve
performance.
Nevertheless,
catalysis
atoms
is
under
investigation.
In
this
study,
we
fabricated
core‐shell
structured
carbon
framework
incorporating
Fe
Bi
through
pyrolysis
COF
MOF
structures.
Introducing
into
ZIF‐8,
Fe‐ZIF‐8
as
core
Bi‐containing
shell,
resulted
in
higher
ORR
activity.
catalyst
exhibited
half‐wave
potential
0.867
V
high
current
density
6.68
mA
cm
−2
0.1
M
KOH,
were
comparable
those
Pt/C
equivalent.
study
provides
new
research
concepts
exploring
application
catalytic
reactions
effects.
Angewandte Chemie,
Год журнала:
2023,
Номер
136(5)
Опубликована: Дек. 13, 2023
Abstract
Covalent
organic
frameworks
(COFs)
have
been
utilized
for
catalyzing
the
reduction
of
carbon
dioxide
(CO2RR)
due
to
their
atomic
metal
centers
and
controllable
pore
channels,
which
are
facilitated
by
different
covalent
bonds.
However,
exploration
boron‐based
linkages
in
these
catalytic
COFs
has
limited
owing
potential
instability.
Herein,
we
present
construction
boronic
ester‐linked
through
nucleophilic
substitution
reactions
order
catalyze
CO
2
RR.
The
inclusion
abundant
fluorine
atoms
within
enhances
hydrophobicity
subsequently
improves
water
tolerance
chemical
stability
COFs.
content
boron
COF
was
carefully
controlled,
with
featuring
a
higher
density
exhibiting
increased
electronic
conductivity,
enhanced
reductive
ability,
stronger
binding
affinity
towards
.
Consequently,
demonstrate
improved
activity
selectivity.
optimized
achieve
highest
activity,
achieving
turnover
frequency
1695.3
h
−1
selectivity
95.0
%
at
−0.9
V.
Operando
synchrotron
radiation
measurements
confirm
Co
(II)
as
catalytically
active
sites.
By
successfully
constructing
COFs,
not
only
address
instability
concerns
but
also
exceptional
performance
Nano Materials Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Май 1, 2024
The
Fe–N–C
catalysts
with
atomic
Fe1
active
sites
are
the
most
low-cost
alternatives
to
Pt/C
for
large-scale
application
of
proton
exchange
membrane
fuel
cells
(PEMFCs).
However,
activity
performance
still
lags
behind
that
Pt
catalysts,
especially
in
PEMFC
devices.
This
review
focuses
on
three
key
factors
affecting
and
advanced
synthesis
strategies
high-performance
Fe–N–C.
Based
literature
data,
we
have
summarized
relationship
between
catalyst
iron
content
effective
site
concentration,
pointed
out
current
difficulties
encountered
design,
proposed
several
aspects
future
research
needs
focus
on.
We
believe
this
could
guide
rational
design
type
single-atom
promote
development
PEMFCs.
