The Journal of Chemical Physics,
Journal Year:
2024,
Volume and Issue:
161(8)
Published: Aug. 22, 2024
Transition-metal
selenides
have
been
extensively
studied
as
promising
electrode
materials
for
supercapacitors.
Engineering
amorphous/crystalline
heterostructures
is
an
effective
strategy
to
improve
rich
active
sites
accelerating
redox
reaction
kinetics
but
still
lacks
exploration.
In
this
study,
heterostructure
was
designed
and
constructed
by
selenizing
the
self-sacrificial
template
NiMnS
generate
amorphous
Mn/polycrystalline
Ni0.85Se–NiSe2
heterophase
via
phase
transformation
from
metal
sulfide
into
selenide.
The
synergy
of
complementary
multi-components
amorphous/polycrystalline
could
enrich
electron/ion-transport
channels
expose
abundant
sites,
which
accelerated
electron/ion
transfer
Faradaic
during
charging/discharging.
As
expected,
optimal
NiMnSe
exhibited
a
high
specific
charge
(1389.1
C
g−1
at
1
A
g−1),
good
rate
capability,
excellent
lifespan
(88.9%
retention).
Moreover,
fabricated
NiMnSe//activated
carbon
device
achieved
long
cycle
life
energy
density
48.0
W
h
kg−1
800
kg−1,
shedding
light
on
potential
use
in
practical
applications,
such
electrochemical
energy-storage
devices.
