Facile synthesis of ZnV2O6 microstructure for hybrid supercapacitor

Abstract

In the present work, ZnV<inf>2</inf>O<inf>6</inf> consisting of microrods and microparticles are successfully synthesized by the most accepted hydrothermal process. Further, ZnV<inf>2</inf>O<inf>6</inf> 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<inf>2</inf>O<inf>6</inf> microstructure is used for supercapacitor. Prepared ZnV<inf>2</inf>O<inf>6</inf> 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<inf>2</inf>O<inf>6</inf> microstructure (positive electrode) and activated carbon (AC) (negative electrode). Aqueous hybrid supercapacitor (ZnV<inf>2</inf>O<inf>6</inf>//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<inf>2</inf>O<inf>6</inf>//AC connected in series. © 2025 Elsevier B.V., All rights reserved.