Abstract
Self-charging supercapacitor power cell (SCSPC) received much attention
for harvesting and storing energy in an integrated device, which paves
the way for developing maintenance free autonomous power systems for
various electronic devices. In this work, a new type of SCSPC device is
fabricated comprising 2D molybdenum di-selenide (MoSe2) as an energy
storing electrode with polyvinylidene fluoride-co-hexafluoropropylene/
tetraethylammonium tetrafluoroborate (PVDF-co-HFP/TEABF4) ion gelled
polyvinylidene fluoride/sodium niobate (PVDF/NaNbO3) as the piezopolymer
electrolyte. The fabricated SCSPC delivers a specific capacitance of
18.93 mF cm−2 with a specific energy of 37.90 mJ cm−2 at a specific power
density of 268.91 μW cm−2 obtained at a constant discharge current of 0.5
mA. The MoSe2 SCSPC device can be self-charged with the aid of mechanical
deformation induced using the applied compressive force, thus making it
harvest and store energy. The MoSe2 SCSPC device can be charged up to
a maximum of 708 mV under a compressive force of 30 N in 100 s, and
the mechanism of charge-storage is discussed in detail. The experimental
findings of this work demonstrate the high efficiency of the fabricated MoSe2
SCSPC device, which can provide new insights for developing sustainable
power sources for the next generation wearable electronic applications.
