Vanadium Pentoxide/Reduced Graphene Oxide Composite as an Efficient Electrode Material for High‐Performance Supercapacitors and Self‐Powered Systems

In this study, we report the facile synthesis of reduced graphene oxide/vanadium pentoxide (GV) composites and the application of this material towards the supercapacitor application. The as‐fabricated reduced graphene oxide/vanadium pentoxide (GV‐3) composite electrodes displayed outstanding electrochemical performance with a maximum specific capacitance of 250 F g −1 at 5 mV s −1 and excellent cycling stability, retaining 95 % of the initial capacitance, even after 5000 cycles, which shows improved behavior compared to rGO and V 2 O 5 . Further, the synthesis process is simple, less time consuming, and requires no sophisticated instruments. In addition, we have demonstrated a self‐powered photosensor system by integrating the solid‐state symmetric GV supercapacitor device with a nanogenerator and photosensor. These results indicate that the reduced graphene oxide/vanadium pentoxide composite electrode can be useful for improved high‐performance supercapacitors.