Abstract
Portable and matured energy storage devices are in high demand for future flexible electronics. Flowery shaped MoS2 nanostructures with porous and flake like morphology was used to study the supercapacitive nature with specific capacitance (Csp) of 169.37F/g, the energy density of 28.43 Wh/Kg and power density of 10.18 W/Kg. This nanoflower like architecture was decorated on 3D-graphene on Graphite electrode to design the solid-state-supercapacitor prototype device of dimensions of 23.6 × 22.4 × 0.6 mm3 having considerable high Csp of 58.0F/g and energy density of 24.59 Wh/Kg, and power density of 8.8 W/Kg. Four fabricated supercapacitors were connected in series for real state practical demonstration using the light emitting diode that remains enlightened for 40 s by charging it only for 25 s. This study demonstrates the 3D-graphene/MoS2 nanohybrid has a quite high overall potential window nearly about 2.7 V (−1.5 to +1.2 V) in KOH-PVA medium which can be used for the development of solid-state supercapacitors thereby completely eliminating the need for any expensive ionic liquid mediums thus building an exciting potential for high-performance energy storage/transfer devices.
Highlights
Current economy and population growth rates project a demand for energy of 40 terawatts (TW) with a total population of 10 billion by 20501
Crystallinity and morphology play an important role in specific capacitance of pseudo capacitors, lower the crystallinity higher is the specific capacitance, which is due to the availability of chemically active dangling units which can take part in oxidation-reduction cycle[8]
Significant efforts have been devoted to improve flexibility and energy storage/transfer capacity of solid-state supercapacitors based on various carbonaceous materials and their composites[26], out of which graphene shows a promising choice of material due to high conductivity, flexibility, transparency, large surface area and layer like structure that drags attention to various scientific communities for its large scale application in energy storage devices[17, 23, 24]
Summary
Characterization of 3D graphene and MoS2 nanoflowers. As-prepared MoS2 nanoflowers were characterized by XRD, SEM, and Raman spectroscopy. Where I is the current, ʋ the scan rate ΔV is the working potential window and m is the active mass of the material present on the surface of the electrode[61] By this equation, the specific capacitance of MoS2 nanostructure comes out to be 145.73F/g (100 mV/s). Green, red and black line denotes the response of graphite, 3D graphene and hybrid material (3D graphene and MoS2) in 0.1 M KOH By comparing their respective cyclic voltammograms, it is observed that the hybrid material increases the working potential window and increases the current response, Csp and energy density for graphite, 3D graphene over graphite and of 3D graphene-MoS2 hybrid comes out to be 7.83, 46.82, 58.0 F/g and 1.09, 13.0, 24.59 Wh/Kg, respectively which shows that the hyrid material has more supercapacitive performance as compared to both 3D graphene and graphite material. After this the two plate was assembled by using filter paper soaked with PVA/KOH solution
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