Manganese-based
oxides
with
high
theoretical
capacity
and
environmental
benignity
are
promising
cathode
materials
for
aqueous
zinc-ion
batteries.
However,
sluggish
reaction
kinetics
poor
structural
instability
pose
significant
challenges,
thereby
restricting
their
practical
applications.
Herein,
a
unique
material
featuring
an
attractive
hierarchical
structure
where
porous
MnO2
nanoflowers
in-situ
anchored
on
hollow
carbon
spheres
(designated
as
C@MnO2
NFs)
is
proposed,
which
fully
exerts
the
compositional
merits
improved
electrochemical
performances.
Specifically,
can
enhance
intrinsic
electronic
conductivity
of
to
accelerate
kinetics,
mitigate
dissolution
active
components,
accommodate
volume
expansion
degradation
cycling
stability.
The
superior
composite
promotes
intercalation/deintercalation
Zn2+
ions
ensures
sites
low
ionic
diffusion
barrier.
As
result,
NFs
deliver
specific
402.0
mAh
g−1
at
0.2
A
g−1,
excellent
stability
(95.7%
retention
after
1000
cycles),
maximum
energy
density
244.2
Wh
kg−1
power
121.0
W
kg−1.
This
combinatorial
design
strategy
opens
new
way
bridge
gap
between
different
ingredients
next-generation
storage
systems.
Langmuir,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 21, 2025
Among
the
multitude
of
toxic
water
pollutants,
Pb2+
poses
a
significant
threat
to
human
health.
A
novel
magnetic
manganese-based
metal-organic
framework
(Mn-MOF)
composite,
MFCys,
was
designed
for
selective
removal
Pb2+.
MFCys
readily
synthesized
through
postsynthetic
modification
Mn-MOF/Fe3O4
(MF)
with
l-cysteine
(l-Cys),
utilizing
prospective
Mn-MOF,
{[Mn2(tzpa)(OH)(H2O)2]·DMA}n.
demonstrated
superior
adsorption
Pb2+,
reaching
equilibrium
within
2
h
compared
Mn-MOF
and
MF.
The
Langmuir
model
indicated
that
underwent
chemisorption
Meanwhile,
process
aligned
pseudo-second-order
(PSO)
kinetic
model,
confirming
adsorbed
by
mainly
monolayer
chemisorption.
Thermodynamic
results
revealed
spontaneous
endothermic.
Moreover,
even
in
presence
competing
Cd2+,
Zn2+,
Ca2+,
Mg2+,
Na+,
K+,
exhibited
exceptional
selectivity
due
electrostatic
interaction
electronic
coupling
effect
between
enabled
easy
separation
from
suspension
1
min
using
an
external
magnet
recycling.
retained
98.0%
initial
capacity
after
five
cycles,
demonstrating
excellent
reusability.
Notably,
displayed
simulated
lead-acid
battery
wastewater,
retaining
98.3%
its
pristine
cycles.
These
findings
suggest
easily
separated
composite
has
promising
application
prospects
wastewater
treatment.
Molecules,
Journal Year:
2025,
Volume and Issue:
30(8), P. 1794 - 1794
Published: April 16, 2025
Synthesis
of
manganese
citrates
was
carried
out
in
the
presence
and
absence
fluoride
ions.
The
HF
or
NaF
led
to
formation
new
layered
whose
crystal
structures
were
determined
by
single-crystal
X-ray
diffraction.
prepared
single-phase
with
without
ions
then
used
as
precursors
for
preparation
mesoporous
MnxOy
hierarchically
porous
MnxOy@C
phases,
which
could
be
interest
catalytic,
sorption,
electrochemical
applications.
