Abstract
The enormous developments in the area of smart and wearable technology have led to grow interest in innovative and portable energy storage devices. This study described the development and electrochemical behavior of asymmetric supercapacitors with a negative electrode of activated-carbon (AC) and positive electrode of cobalt-molybdate/reduced graphene-oxide/polyaniline (CoMoO4 /rGO/PANI). The positive electrode materials of CoMoO4 /rGO/PANI were synthesized using a facile hydrothermal approach. The nanocomposites were characterized using physico-chemical methods including nitrogen adsorption-desorption isotherm analysis, X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), X-ray Photon Spectroscopy (XPS) and Raman spectroscopy. The CoMoO4/rGO/PANI nanocomposite showed a noticeable specific capacity of 630 C g−1 when tested with three electrodes in 3 M alkaline solution (KOH). The CoMoO4 /rGO/PANI //AC asymmetric device demonstrated the optimal specific capacitance of 350 C g−1 with an energy density of 96 W h kg−1 with current density of 1.4 A g−1. The assembled device demonstrated enhanced cyclic stability with outstanding capacitance retention of nearly 97 % after 10,000 cycles (at 51 mA cm2 areal-current density). This composite electrode has a lot of promise for usage in wearable technology, flexible electronics, and technological gadgets.
Published Version
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