The
depletion
of
fossil
fuels
necessitates
the
search
for
alternative
sources
energy
conversion
and
storage
long-term
usage.
Recently
graphitic
carbon
nitride
(g-C3N4)
based
materials
have
gained
attention
due
to
their
enhanced
activity
compared
previously
tested
materials.
But
poor
electron
mobility
g-C3N4
continues
cause
a
significant
loss
in
electrocatalytic
process.
Herein
we
report
synthesis
characterization
g-C3N4/Bromocobaloxime
composites
applications
towards
hydrogen
evolution
reactions
(HER),
oxygen
(OER)
storage.
Bromocobaloximes
[BrCo(dpgH)2B]
containing
diphenylglyoxime
[dpgH]
as
equatorial
ligand
functionalized
neutral
bases
such
Isonicotinic
acid
(1),
Pyridine-3,5-dicarboxylic
(2),
Indole-2-carboxylic
(3)
p-Aminobenzoic
(4)
been
synthesized.
g-C3N4/cobaloxime
nanocomposites
(g-C3N4/B1,
g-C3N4/B2,
g-C3N4/B3
g-C3N4/B4)
are
prepared
using
nanosheets
by
solvothermal
method.
characterized
FT-IR,
UV-DRS,
XRD,
SEM,
EDAX,
TEM
XPS
analysis.
HER
studies
show
lower
overpotential
range
51
mV
228
at
-10
mAcm-2
OER
exhibit
310
460
10
mAcm-2.
nanocomposite
g-C3N4/B2
having
two
carboxylic
moieties
has
higher
efficiency
with
Tafel
slope
45
mv/dec
112
than
other
nanocomposites.
supercapacitance
studied
cyclic
voltammetry
charge-discharge
indicate
that
among
nanocomposites,
g-C3N4/B1
good
specific
capacitance
302
F/g
0.5
A/g.
increased
electrochemical
performance
synthesized
is
incorporation
cobaloxime
complexes
into
increases
mobility.
In
particular,
presence
withdrawing
group
base
less
electronegative
halide
ion
axial
increase
catalytic
composites.
clearly
composite
can
be
improved
fine-tuning
ligands
complexes.
This
will
lead
explore
g-C3N4/metal
tuning
metal
complex.
Energy Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 9, 2025
Designing
electrocatalysts
with
high‐performance
potential
requires
a
thorough
investigation
of
the
relationships
between
property
changes
and
electrocatalytic
activity.
This
study
compares
effect
N‐doping
N,
S‐codoping
on
properties
waste
floral
foam
derived
pristine
nanoporous
carbon
to
enhance
modulates
textural,
structural,
chemical
that
are
preferable
oxygen
evolution
reaction
(OER)
hydrogen
(HER)
performance.
S‐codoped
having
large
surface
area
(1231
m
2
g
−1
),
higher
content
defects,
OH−,
CO,
pyridinic
N
exhibits
superior
OER
HER
activity
overpotentials
290
−180
mV,
respectively
at
10
mA
cm
−2
,
emphasizing
synergetic
dual
atoms
nitrogen
(N)
sulfur
(S)
in
enhancing
The
work
proposed
here
presents
implementation
“waste‐to‐energy”
through
repurposing
into
as
metal‐free
bifunctional
electrocatalyst
for
HER.
Abstract
In
search
for
novel
materials
to
replace
noble
metal‐based
electrocatalysts
in
electrochemical
energy
conversion
and
storage
devices,
special
attention
is
given
a
distinct
class
of
materials,
MAX
phase
that
combines
advantages
ceramic
metallic
properties.
Herein,
Nb
4
AlC
3
prepared
by
solid‐state
mixing
reaction
characterized
morphologically
structurally
transmission
scanning
electron
microscopy
with
energy‐dispersive
X‐ray
spectroscopy,
nitrogen‐sorption,
diffraction
analysis,
photoelectron
Raman
spectroscopy.
Electrochemical
performance
terms
capacitance
as
well
oxygen
reduction
(ORR)
hydrogen
evolution
(HER)
evaluated
different
electrolytes.
The
specific
C
s
66.4,
55.0,
46.0
F
g
−1
at
5
mV
determined
acidic,
neutral
alkaline
medium,
respectively.
Continuous
cycling
reveals
high
retention
three
electrolyte
media;
moreover,
increase
observed
acidic
media.
impedance
spectroscopy
showed
low
charge
transfer
resistance
64.76
Ω
cm
2
resulted
better
HER
medium
(Tafel
slope
60
dec
).
media,
the
value
double
layer
360
mF
−2
(0.7
V
versus
reversible
electrode)
best
ORR
achieved
this
126
