Architecture of hybrid electrode by the composition of CoMoO4 /rGO/PANI for asymmetric supercapacitors

The enormous developments in the area of smart and wearable technology have led to grow interest in inno-vative 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.