posted on 2017-02-27, 00:00authored bySanjoy Mondal, Utpal Rana, Sudip Malik
We
have synthesized a ternary rGO/Fe3O4/PANI
(rGFP) composite for binder-free, semiflexible, thin, all-solid-state
supercapacitor device fabrication. A scalable soft-template technique
has been adopted for the preparation of three-dimensional Fe3O4-decorated reduced graphene oxide (rGO)-doped polyaniline
(PANI) nanorods that are unambiguously investigated under electron
microscopes (FESEM and HRTEM). The presence of PANI in the nanocomposite
is overwhelmingly supported by the absorption and vibration studies.
Raman spectra convincingly show the presence of rGO in the nanocomposites,
and the formation of Fe3O4 nanoparticles is
confirmed by XRD and XPS results. The specific capacitance value that
has been achieved for synthesized ternary rGFP nanocomposite is ∼283.4
F/g at 1.0 A/g current density and exhibited a maximum energy density
of 47.7 W h/kg at a power density of 550 W/kg. Interestingly, after
5000 cycles the composite shows excellent life stability that is a
78% retention of the electrochemical property. To demonstrate the
portable energy storage applicability, a binder-free rGFP-based supercapacitor
device was fabricated, which illustrated the operation of an LED bulb
for 30 min when fully charged. These results indicate that synthesized
ternary nanocomposites are worth their potential as an electrode material
and would be used in next-generation high-rate energy storage systems.