Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 13, 2024
Abstract
The
continuous
research
on
electrocatalytic
nanomaterials
for
critical
raw
materials
replacement
has
returned
the
important
class
of
Platinum‐group‐metal‐free
electrocatalysts
(PGM‐free),
based
C,
N,
and
non‐noble
transition
metals.
PGM‐free
are
employed
in
Fuel
Cells,
Zinc‐Air
batteries,
Electrolyzers
to
catalyze
energy‐related
reactions.
They
usually
synthesized
following
a
chemical
route
mixing,
pyrolyzing,
postprocessing
specific
N‐
metal‐containing
compounds
into
conductive
C
structures,
leading
high
content
byproducts.
Herein,
first
time,
new
approach
synthesis
is
investigated,
nitrogen
implantation
via
ion
beam
produced
with
Kaufman
apparatus,
iron
evaporation
inside
clean
chamber.
performed
investigation,
model
sp
2
carbonaceous
material
(vertically
aligned
carbon
nanotubes),
showed
similarities
terms
surface
functionalization
possibility
maximize
pyridinic
N
content,
paving
way
time
nitrogen‐compound‐free
nanoelectrocatalysts.
Chemical Engineering Journal,
Journal Year:
2023,
Volume and Issue:
465, P. 142987 - 142987
Published: April 18, 2023
Fe-N-C
catalysts
were
synthesized
by
combining
a
Zn-based
zeolitic
imidazolate
framework
(ZIF-8)
structure,
adopted
as
nitrogen-carbon
template,
with
an
iron
salt
and
conductive
carbon
support
followed
thermal
treatment.
The
effect
of
three
different
pyrolysis
temperatures
(700,
900,
1000
°C)
on
Zn
removal
from
ZIF-8
was
investigated
to
enhance
the
formation
Fe-based
moieties
in
Nx-C
groups
during
carbonization.
Electrochemical
characterization
using
rotating
ring
disk
electrode
alkaline
electrolyte
demonstrated
that
ORR
activity
increased
temperature
increased.
This
trend
can
be
ascribed
more
effective
high-active
iron-
nitrogen-based
catalytic
sites,
pointed
out
materials'
chemical
surface
analysis
after
step.
sample
Fe-N-C-1000
remarkable
activity,
even
higher
than
Pt/C
taken
reference.
When
subjected
accelerated
stress
tests,
displayed
performance
durability
over
long
cycling
duration
(30,000
cycles)
compared
control.
Tests
AEMFC
fed
H2
showed
catalyst
competitive
(OCV
=
0.98
vs.
1.05
V,
149
148
mW
cm−2)
state-of-the-art
electrode,
FUMASEP®
FAA-3-50
membrane.
material
found
application
also
direct
methanol
fuel
cell
(ADMFC)
solutions
at
high
concentrations
(up
10
M)
due
tolerance,
experiments.
Carbon,
Journal Year:
2023,
Volume and Issue:
219, P. 118781 - 118781
Published: Dec. 31, 2023
Developing
sustainable
and
efficient
bifunctional
catalysts
for
oxygen
reduction
(ORR)
evolution
(OER)
reactions
is
challenging
energy
conversion
storage.
This
work
proposes
a
hierarchical
carbon
matrix
decorated
with
nitrogen
atoms
(NC)
as
support
obtaining
high-performance
electrocatalysts
based
on
iron
nickel
(Fe/Ni@N–C).
The
effect
of
different
Fe:Ni
ratios
the
pyrolysis
conditions
catalyst
performance
were
investigated
by
combining
electrochemical
tests,
N2-adsorption-desorption,
X-ray
diffraction,
Transmission
Electron
Microscopy,
photoelectron
spectroscopy.
Once
optimized
ratio,
Fe/Ni@N–C
showed
high
OER/ORR
activity
in
three-electrode
cell
an
alkaline
environment
(KOH
1
M),
overall
ΔE
ORR-OER
reaction
0.75
V.
was
assembled
rechargeable
zinc-air
battery,
resulting
excellent
terms
power
density
(148.5
mWcm−2)
durability,
outperforming
benchmark
Pt/C–RuO2.
Industrial Chemistry and Materials,
Journal Year:
2023,
Volume and Issue:
1(4), P. 526 - 541
Published: Jan. 1, 2023
This
study
investigates
the
oxygen
reduction
reaction
activity
of
transition-metal-doped
ZIF-8
and
carbon-nanotube-based
composite
catalysts
in
alkaline
media
their
performance
anion-exchange
membrane
fuel
cells
using
an
Aemion+®
15
μm
AEM.
Electrochimica Acta,
Journal Year:
2024,
Volume and Issue:
492, P. 144353 - 144353
Published: April 28, 2024
The
annual
generation
of
coffee
waste
has
overtaken
6
million
metric
tons,
becoming
a
serious
environmental
problem.
Herein,
we
report
the
fabrication
bimetallic
electrocatalysts
synthesized
by
1)
pyrolyzing
spent
grounds
(SCGs)
at
400,
600,
800
and
1000°C,
2)
activating
as-obtained
char
with
KOH
3)
functionalizing
activated
carbon
iron(II)
manganese(II)
phthalocyanine.
final
showed
high
degree
amorphousness,
defectivity
(increasing
temperature)
specific
surface
area
(up
to
1820
m2
g−1).
In
half-cell
compartment
(0.1M
electrolyte),
top-notch
material
in
terms
oxygen
reduction
reaction
(ORR)
activity
selectivity
was
CFeMn_600,
which
same
half-wave
potential
(E1/2)
compared
Pt/C
standard
along
lower
peroxide
production.
These
outstanding
results
could
be
attributed
area,
Fe-Mn
synergy,
an
abundance
C-N
defects.
performance
CFeMn_600
as
cathode
alkaline
exchange
membrane
fuel
cells
(AEMFC)
open
circuit
voltage
(OCV)
0.890
V
power
density
30
mW
cm−2.
Notwithstanding,
this
research
is
one
few
cases
where
waste-derived
electrocatalyst
tested
real
AEMFC,
thus
pioneer
cell
study
electrode
materials.
ChemElectroChem,
Journal Year:
2024,
Volume and Issue:
11(11)
Published: April 30, 2024
Abstract
Trillion
of
cigarette
butts
are
annually
littered
without
being
recycled.
This
work
aims
at
valorizing
the
whole
and
their
components
(paper,
filter
tobacco)
into
Fe‐N
x
‐C
electrocatalysts
for
oxygen
reduction
reaction
(ORR)
in
acid
alkaline
media.
The
pristine
wastes
were
pyrolyzed
450
°C,
activated
with
KOH
700
blended
iron
phthalocyanine
(FePc)
precursor,
heat‐treated
600
°C
to
produce
a
robust
material
ORR
active
units.
effect
on
final
electrocatalytic
activity
was
evaluated
by
thoroughly
investigating
surface
chemistry
XPS.
displayed
similar
results
among
different
both
media
due
comparable
chemistry,
especially
concerning
nitrogen
functional
groups.
highest
performance
obtained
where
from
cigarettes
paper
(CIGF_450
CIGPF_450)
showed
an
E
1/2
0.89
V
vs
RHE,
slightly
larger
than
that
Pt/C
40
wt
%
Pt,
which
encouraged
replace
Pt‐based
fuel
cells.
