Marigold flower-like Sn3O4 nanostructures as efficient battery-type electrode material for high-performing asymmetric supercapacitors

Abstract

• Hydrothermal synthesis of Sn 3 O 4 flower-type nanostructure for supercapacitor application. • 3D-marigold Sn 3 O 4 could provide ample space for electrode–electrolyte interaction . • Thin nanoflakes also afford a large number of active surfaces for the charging-discharging. • Device delivered 34.4 Wh/kg energy density at a 775 W/kg power density with 99.8 %. Designing novel nanostructured electrode materials is a vital step to upgrade electrochemical applications. Certain facile methods are followed to develop nanomaterials with unique morphology that could encourage electrode activity in a supercapacitor. Here we have explored the electrochemical behavior of hydrothermal synthesized Sn 3 O 4 flower-type nanostructured for supercapacitor application. It is found that the mixed state of tin oxide (Sn 3 O 4 ) is highly electroactive in 3 M KOH electrolyte which exhibited a high specific capacity of 194 C g −1 . Such high charge storage may be due to the 3D-marigold flower-type morphology of Sn 3 O 4 nanoparticles that could provide ample space for electrode–electrolyte interaction. The thin nanoflakes also afford a large number of active surfaces for the charging-discharging process. Further, the electrode was implemented in an asymmetric device with activated carbon. The device delivered 34.4 Wh/kg energy density at a 775 W/kg power density with 99.8% Coulombic efficiency for 5000 cycles. Thus, the Sn 3 O 4 flower-type nanostructure is potential electrode material for charge storage in supercapacitors and the practical applicability of the asymmetric device is proved by illuminating the green light-emitting diode.