Synthesis of Ce-V-Mo Oxide Nanocomposite for High Performance All Solid State Asymmetric Supercapacitors (ASSASs)

Abstract

The depletion of non-renewable resources has prompted the continuous development of various energy storage systems to manage the world’s increasing demand for energy. Among the well-known energy storage systems, supercapacitors (SCs) exhibit superior performance because they can store more energy than conventional capacitors and have a higher power density than batteries. In this context, we have strategically synthesized ternary Ce-V-Mo oxide (CVMO) nanocomposite and directly utilized it in all solid state supercapacitor device. The phase purity, element composition and surface morphology were characterized by PXRD, EDS, FESEM, HRTEM and XPS measurements. The pseudocapacitive charge storage efficiency of CVMO was thoroughly studied by CV, GCD and EIS measurements. The CVMO offers a specific capacitance value of 5484 F g–1 at scan rate of 5 mV s–1 and 4330 F g–1 at a current density 4 Ag–1. The CVMO also retains ~87% of specific capacitance at a high current density of 20 A g–1. The EIS study shows low solution and charge transfer resistance of CVMO. An ASSAS device fabricated using N-rGO as the negative electrode material shows high rate capacitance, and superior energy density at elevated power density condition. The results presented here is significant in the context of developing high performance ASSASC devices for numerous technological viability.1-5