Pseudocapacitance
materials
can
store
charge
through
reversible
redox
reactions,
making
them
attractive
for
high-energy
density
supercapacitors.
However,
their
practical
applications
are
limited
by
low
capacitance,
insufficient
active
sites,
and
poor
cycling
stability.
To
address
these
issues,
we
develop
an
extrinsic
phase
transformation
strategy
to
alter
the
pseudocapacitive
into
battery-type
with
a
well-defined
construction
of
amorphous/crystalline
hetero-phases
multi
metal
sulfides.
The
optimal
in-situ
growth
hetero-phase
cobalt
molybdenum
sulfides-nickel
sulfides
on
carbon
fiber
cloth
(CoMoS4-NiS2@CFC)
is
designed
as
positrode.
CoMoS4-NiS2@CFC
electrode
exhibits
superior
areal
capacity
1341
mC
cm-2
remarkable
retention
~91%
after
5000
cycles.
Theoretical
calculations
revealed
metallic
nature
favorable
OH-
ion
adsorption
energy
-4.35
eV
which
enhances
its
storage
performance.
Furthermore,
hybrid
supercapacitor
(HSC)
comprising
CoMoS4-NiS2@CFC//AC
demonstrates
high
specific
51.99
W
h
kg-1
at
power
800
kg-1,
sustains
23.83
8.0
kW
robust
cyclic
stability
(~91%)
over
10000
Quasi-solid
state
(QSS)
flexible
HSC
maximum
volumetric
12
mW
cm-3
3812
~92%
retention.
This
work
advances
design
multi-metal
sulfides,
contributing
significantly
development
high-performance
devices.
