Materials Reports Energy,
Год журнала:
2023,
Номер
3(3), С. 100215 - 100215
Опубликована: Июль 25, 2023
Currently
the
catalysis
of
hydrogen
evolution
reaction
(HER)
is
mainly
focused
on
inherent
electrocatalytic
activity
at
relatively
lower
current
densities
while
scarce
high
densities.
Nevertheless,
latter
highly
demanding
in
efficient
mass-production
hydrogen.
A
SiO2
nanospheres
template-synthesis
used
to
prepare
mesoporous
molybdenum
carbide
nanocrystals-embedded
nitrogen-doped
carbon
foams
(mp-Mo2C/NC).
The
material
shows
much
more
excellent
catalytic
than
non-etched
Mo2C/NC
toward
acidic
medium.
More
interestingly
mp-Mo2C/NC
still
has
larger
overpotential
Pt/C
densities,
but
possess
remarkably
smaller
higher
for
better
performance.
An
approach
developed
investigate
electrode
kinetics
by
Tafel
plots,
especially
with
eliminating
diffusion
effect,
indicating
that
and
display
different
mechanisms.
At
low
former
presents
reversible
reaction,
mixed
electrochemical
polarization/reversible
process.
In
region
becomes
totally
gas-diffusion
controlled
large
overpotential,
can
retain
an
polarization
process
same
density.
Result
endorses
meso-porously
structured
plays
a
critical
role
avoiding
gas
control-resulting
This
work
holds
great
potential
inexpensive
catalyst
practical
applications
clearly
shedding
fundamental
lights
designs
rational
HER
catalysts
uses
Analytical Chemistry,
Год журнала:
2023,
Номер
95(22), С. 8640 - 8648
Опубликована: Май 23, 2023
Monitoring
acetylcholinesterase
(AChE)
and
its
inhibitors
is
of
importance
for
early
diagnosis
therapy
neurological
diseases.
Herein,
N-doped
carbon
nanotubes
supported
Fe–Mn
dual-single-atoms
(FeMn
DSAs/N-CNTs)
were
fabricated
by
a
simple
pyrolysis,
as
thoroughly
figured
out
series
the
characterization
techniques.
The
peroxidase-like
activity
FeMn
DSAs/N-CNTs
was
investigated
catalytic
oxidation
3,3′,5,5′-tetramethylbenzidine
(TMB)
to
generate
rich
hydroxyl
radicals
(·OH)
in
H2O2
system,
which
effectively
catalyzed
colorless
TMB
blue
oxidized
(ox-TMB).
Besides,
greatly
weakened
thiocholine
(derived
from
AChE),
accompanied
making
ox-TMB
fade.
Impressively,
highly
improved
property
further
evidenced
density
functional
theory
(DFT)
calculations,
where
dual-single
atoms
show
lower
energy
barrier
(0.079
eV)
their
interactions
with
N-CNTs
played
critical
roles
producing
oxygen
radicals.
By
virtue
nanozyme,
low-cost,
specific,
sensitive
colorimetric
sensor
built
detection
AChE
broader
linear
range
0.1–30
U
L–1
limit
(LOD,
0.066
L–1),
combined
feasible
analysis
human
serum
samples.
Also,
this
platform
applied
measuring
huperzine
A
inhibitor
wide
scope
5–500
nM
LOD
down
4.17
nM.
This
strategy
provides
low-cost
convenient
approach
clinical
drug
development.
Transition
metal
catalysts
are
regarded
as
one
of
promising
alternatives
to
replace
traditional
Pt-based
for
oxygen
reduction
reaction
(ORR).
In
this
work,
an
efficient
ORR
catalyst
is
synthesized
by
confining
Fe3
C
nanoparticles
into
N,
S
co-doped
porous
carbon
nanosheets
(Fe3
C/N,S-CNS)
via
high-temperature
pyrolysis,
in
which
5-sulfosalicylic
acid
(SSA)
demonstrates
ideal
complexing
agent
iron
(ΙΙΙ)
acetylacetonate
while
g-C3
N4
behaves
a
nitrogen
source.
The
influence
the
pyrolysis
temperature
on
performance
strictly
examined
controlled
experiments.
obtained
exhibits
excellent
(E1/2
=
0.86
V;
Eonset
0.98
V)
alkaline
electrolyte,
coupled
exhibiting
superior
catalytic
activity
and
stability
0.83
V,
0.95
Pt/C
acidic
media.
parallel,
its
mechanism
carefully
illustrated
density
functional
theory
(DFT)
calculations,
especially
role
incorporated
played
process.
catalyst-assembled
Zn-air
battery
also
much
higher
power
(163
mW
cm-2
)
ultralong
cyclic
charge-discharge
test
750
h
with
gap
increase
down
20
mV.
This
study
provides
some
constructive
insights
preparation
advanced
green
energy
conversion
units
correlated
systems.
