Unlocking enhanced electrochemical performance of SnO2-Bi2WO6 nanoflowers for advanced supercapacitor device

Abstract

SnO2 quantum dots interspersed Bi2WO6 nanoflowers were successfully synthesized to create a cost-efficient electrode material specifically designed for energy storage devices. The performance of the electrodes was evaluated by studying their structural and functional properties. The SnO2 quantum dots coupled with Bi2WO6 nanoflowers-based electrodes exhibited an enhanced electrochemical behavior compared to those without the SnO2. A functional investigation of the developed electrodes in a 3 M KOH electrolyte demonstrated specific capacitance values of 812 and 741 F.g−1 (225.5 and 206 mAh.g−1) for SnO2-Bi2WO6 (BWSq) and Bi2WO6 (BW) nanoflowers, respectively, at a current density of 7 A.g−1. Excellent cycling stability was observed for both BWSq and BW electrodes, with specific capacity values of 226 and 159 mAh.g−1 (814 and 572 F.g−1), respectively, after 3000 cycles at a current density of 22 A.g−1. The fabricated BWSq symmetric super-capacitor (SSC) device demonstrated a superior performance with an exceptional specific capacitance of 75.6 F.g−1 when subjected to a current density of 0.5 A.g−1. Additionally, the device displayed impressive energy and power densities, reaching 31.1 Wh.kg−1 and 14040 W.kg−1, respectively. Moreover, the BWSq SSC device demonstrated notable cyclic stability, manifesting a capacity retention of 62% over 5000 galvanostatic charge-discharge cycles. The outcomes of this study suggest that the BWSq nanostructure holds immense promise as a prospective contender for energy storage applications, offering great potential for practical implementation.