Facile synthesis of ZnV2O6 microstructure for hybrid supercapacitor

In the present work, ZnV 2 O 6 consisting of microrods and microparticles are successfully synthesized by the most accepted hydrothermal process. Further, ZnV 2 O 6 microstructure is characterized by various characteristic techniques and discussed. The combination of microrods and microparticles provides extra housing to electrons/ions and improves ions/electron dynamic in electrochemical analysis. Therefore, prepared ZnV 2 O 6 microstructure is used for supercapacitor. Prepared ZnV 2 O 6 microstructure yields the specific capacitance of 522 F g −1 at 1 A g −1 and exhibits admirable cycling capability. Furthermore, for practical application, aqueous hybrid supercapacitor is fabricated by ZnV 2 O 6 microstructure (positive electrode) and activated carbon (AC) (negative electrode). Aqueous hybrid supercapacitor (ZnV 2 O 6 //AC) delivers the high energy density of 44.0 W h kg −1 at the power density of 800 W kg −1 . Furthermore, yellow color two light-emitting diodes (LEDs), digital thermometer/humidometer, toy motor fan and kitchen timer are powered by two ZnV 2 O 6 //AC connected in series. • The ZnV 2 O 6 microstructure is synthesized by the hydrothermal method. • Supercapacitive properties of ZnV 2 O 6 microstructure are performed. • High specific capacitance of 522 F g −1 is observed at 1 A g −1 . • An aqueous hybrid supercapacitor (ZnV 2 O 6 //AC) is designed. • Energy density of 44.0 W h kg −1 at 800 W kg −1 is obtained from ZnV 2 O 6 //AC.