Dalton Transactions,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Fe-N-C
catalysts
are
considered
promising
substitutes
for
Pt-based
at
the
cathode
in
direct
methanol
fuel
cells
(DMFCs)
owing
to
their
great
tolerance.
However,
Fe-N-C-based
DMFCs
commonly
suffer
from
a
decreased
performance
under
extremely
high
concentrations
and
exhibit
poor
stability,
while
underlying
mechanism
remains
controversial.
In
this
study,
self-degradation
phenomenon
passive
DMFC
was
investigated
detail.
The
with
an
optimized
ionomer
content
catalyst
loading
delivered
peak
power
density
of
28.85
mW
cm-2
when
fed
3
M
solution,
cell
rapidly
declined
16.61
after
standing
10
days
without
any
discharging
operation.
Several
electrochemical
measurements
were
designed
conducted
explore
phenomenon.
results
these
revealed
that
molecules
chemically
adsorbed
on
surface
catalyst,
bonding
cannot
be
reversed
using
simple
physical
methods,
leading
isolation
active
sites
oxygen.
Herein,
we
provide
new
perspective
would
significant
technological
development
portable
devices.
Abstract
Fuel
cells
have
emerged
as
a
promising
clean
electrochemical
energy
technology
with
great
potential
in
various
sectors,
including
transportation
and
power
generation.
However,
the
high
cost
scarcity
of
noble
metals
currently
used
to
synthesise
electrocatalysts
for
low‐temperature
fuel
has
hindered
their
widespread
commercialisation.
In
recent
decades,
development
non‐precious
metal
cathodic
oxygen
reduction
reaction
(ORR)
gained
significant
attention.
Among
those,
atomically
dispersed
active
sites,
referred
single‐atom
catalysts
(SACs),
are
gaining
more
interest.
Nanocarbon
materials
containing
single
transition
atoms
coordinated
nitrogen
ORR
both
acidic
alkaline
conditions
thus
promise
be
utilised
cathode
cells.
This
review
article
provides
an
overview
advancements
utilisation
metal‐based
SACs
proton
exchange
membrane
(PEMFCs)
anion
(AEMFCs).
We
highlight
main
strategies
synthetic
approaches
tailoring
properties
enhance
activity
durability.
Based
on
already
achieved
results,
it
is
evident
that
indeed
could
suitable
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(5), С. 1725 - 1755
Опубликована: Янв. 1, 2024
This
article
summarizes
the
regulation
strategies
of
Fe-based
MOFs-derived
electrocatalysts
for
ZABs,
and
provides
a
prospect
their
future
development.
Advanced Functional Materials,
Год журнала:
2023,
Номер
34(9)
Опубликована: Ноя. 27, 2023
Abstract
Engineering
the
electronic
configuration
and
intermediates
adsorption
behaviors
of
high‐performance
non‐noble‐metal‐based
catalysts
for
sluggish
oxygen
reduction
reaction
(ORR)
kinetics
at
cathode
is
highly
imperative
development
anion
exchange
membrane
fuel
cells
(AEMFCs),
yet
remains
an
enormous
challenge.
Herein,
a
rare‐earth
metal
oxide
engineering
tactic
through
formation
Fe
3
O
4
/La
2
heterostructures
in
N,O‐doped
carbon
nanospheres
(Fe
@N,O‐CNSs)
efficient
electrocatalysis
reported.
The
theoretical
calculations
reveal
that
interfacial
bonds
formed
by
La─O─Fe
heterogeneous
interface
effectively
optimize
structure
d‐band
center
relative
to
Fermi
level,
which
results
significant
barriers
rate‐limiting
steps
during
ORR.
modulation
chemisorption
enables
@N,O‐CNSs
outstanding
ORR
performance
improved
stability,
with
significantly
higher
half‐wave
potential
value
(0.88
V).
More
impressively,
this
integrated
catalyst
delivers
remarkable
power
density
148.7
mW
cm
−2
practical
AEMFC
operating
conditions,
along
negligible
degradation
over
100
h
using
H
‐air
atmosphere,
than
commercial
Pt/C‐coupled
electrodes.
presented
here
are
believed
provide
guidelines
fabricating
AEMFCs
electrocatalysts
terms
heterointerface
strong
coupling
effect
induced
oxides.
Energy & Fuels,
Год журнала:
2024,
Номер
38(12), С. 10589 - 10612
Опубликована: Июнь 7, 2024
The
oxygen
reduction
reaction
(ORR)
holds
significant
importance
in
the
electrochemical
processes
of
energy
conversion
systems.
kinetics
ORR
are
sluggish
as
it
is
involved
multistep
reactions.
It
imperative
to
investigate
electrocatalysts
with
outstanding
performance
and
durability
accelerating
their
kinetics.
Manganese–nitrogen–carbon
(Mn–N–C)
materials
offer
advantages
including
efficient
atom
utilization
easily
tunable
coordination
structures,
rendering
them
promising
candidates
for
enhancing
catalytic
activity.
mini-review
provides
a
concise
overview
fundamental
principles
underlying
ORR.
Then,
three
strategies
regulating
structure
summarized
improve
activity
Mn–N–C
catalysts:
adjusting
number
N
atoms
around
Mn
atoms,
doping
nonmetal
metal
atoms.
Finally,
this
outlines
challenges
prospects
associated
catalyst
This
anticipated
deepen
comprehension
readers
by
presenting
targeted
optimization
methods
regulate
configuration
catalysts.
ACS Applied Nano Materials,
Год журнала:
2023,
Номер
6(18), С. 16662 - 16673
Опубликована: Сен. 8, 2023
The
evolution
of
highly
active
dual-functional
catalysts
is
critical
to
zinc–air
batteries
(ZAB).
Herein,
three-dimensional
Fe–N/P-co-doped
graphene
(3D
Fe–N/P-G)
materials
with
a
high
oxygen
reduction
reaction
(ORR)
and
(OER)
response
are
prepared
by
molten
salt
protection
method
KCl.
3D
Fe–N/P-G
exhibits
large
Brunauer–Emmett–Teller
(BET)
surface
area
dense
network
pores
for
improved
mass
transfer
efficiency.
addition
P
atoms
able
produce
synergistic
effect
that
improves
the
ORR
catalytic
activity
catalyst.
Regarding
electrical
efficiency,
half-wave
potential
(E1/2)
0.860
V
vs
reversible
hydrogen
electrode
(RHE)
electron
number
3.98
from
0.4
0.7
RHE.
small
overvoltage
(ΔE
=
Ej
10
–
E1/2)
0.77
V.
Additionally,
battery
as
trigger
cathode
has
power
density
(170
mW
cm–2),
specific
capacity
(671
mAh
g–1),
charge/discharge
polarization,
outstanding
prolonged
stability.
It
suggested
powerful
bifunctional
ZAB
