Facile synthesis of ZnV₂O₆ microstructure for hybrid supercapacitor

In the present work, ZnV₂O₆ consisting of microrods and microparticles are successfully synthesized by the most accepted hydrothermal process. Further, ZnV₂O₆ 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 ZnV₂O₆ microstructure is used for supercapacitor. Prepared ZnV₂O₆ 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 ZnV₂O₆ microstructure (positive electrode) and activated carbon (AC) (negative electrode). Aqueous hybrid supercapacitor (ZnV₂O₆//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 ZnV₂O₆//AC connected in series.