Layered intercalated architecture of Ni2V2O7 nanoparticle and N-doped reduced graphene oxide composite sheet as an electrode material for solid-state asymmetric supercapacitor

In this study, we present Ni 2 V 2 O 7 (NVO) nanoparticles integrated within a nitrogen-doped reduced graphene oxide (N-rGO) layered structure, serving as a positive electrode material for the supercapacitor applications. The composite is synthesized using an inexpensive and easily scalable route of the hydrothermal method . Among the as-synthesized N-rGO-NVO composites, the 40N-rGO-NVO composite delivers an excellent electrochemical performance . It delivers a specific capacitance of 712.5 F g −1 at 1 mA cm −2 fixed current density. A solid-state asymmetric supercapacitor (ASC) energy storage device uses the 40N-rGO-NVO composite material as the positive electrode while the negative electrode is made from the activated carbon (AC). The fabricated ASC device displays an energy density (E) and power density (P) of 14 Wh·kg −1 and 7500 W kg −1 , respectively, at 10 mA cm −2 current density. The fabricated ASC device maintains about 75 % of its original capacitance retention after undergoing 5000 cycles of charge and discharge at 10 mA cm −2 current density, confirming its good cycling stability. • Synthesis of N-rGO-NVO composite as a layered intercalated architecture. • 40N-rGO-NVO composite exhibits high specific capacitance and energy density . • Detailed study of the excellent electrochemical performance of the composites. • Successfully fabricated a solid-state asymmetric supercapacitor .