Wasp Nest Shaped Bi2mo2o9 and Rgo/Bi2mo2o9 Single-Phase Nano Self-Assembly for Performance-Enhanced Asymmetric Supercapacitor

The fascinating potential features of metal molybdates drew the attention of researchers due to their use as electrodes in energy storage devices of high performance. The present work shows the preparation of single-phase Bismuth Molybdate (Bi 2 Mo 2 O 9 ) and graphene Bi 2 Mo 2 O 9 decorated using the sol-gel combustion technique. XRD, Raman Spectroscopy, FTIR, UV-Vis Spectroscopy, and SEM were used to examine the crystal structure, morphology, and phase purity of as-prepared pure and RGO/Bi 2 Mo 2 O 9 nanocomposites. The morphology of the as-synthesized Bi 2 Mo 2 O 9 is in Wasp’s nest structure, indicating nanoparticles combined and forming self-assembly. UV-visible Spectroscopical studies of RGO/Bi 2 Mo 2 O 9 rendered its optical properties. XPS analysis reveals the presence of Bi, Mo, and O in Bi 2 Mo 2 O 9 particles, and also anchorage of Bi 2 Mo 2 O 9 on RGO was confirmed. Electrochemical tests such as GCD, CV, and EIS were performed to examine the electrochemical behaviour of pure and RGO/Bi 2 Mo 2 O 9 nanocomposite. The RGO/Bi 2 Mo 2 O 9 nanocomposite exhibits a greater specific capacitance (Cs) of 831 Fg -1 at 1 A/g. Significant cycle stability of 87.97 percent specific capacitance retention after 5000 cycles was also reported when compared to pure Bi 2 Mo 2 O 9 . A maximum energy density of 54.16 Wh/kg was observed in the fabricated asymmetric device. Further, a power density of 750 W/kg at 1 A/g with the 0-1.5 V potential window in 3M KOH electrolyte and the chosen electrode retained capacitively 74.28% at 5 A/g over 10,000 cycles was also observed. The noticeable electrochemical behaviour of the RGO decorated bismuth molybdate suggests that it might be a suitable electrode material for energy storage applications.