Harnessing energy on paper: Symmetric supercapacitor based on manganese stannate perovskite nanoparticles

Organic molecule stabilized manganese stannate (MnSnO₃) perovskite nanoparticles were synthesized using a complexion strategy route. The Rietveld refinement analysis confirmed the formation of orthorhombic structure of manganese stannate with the space group of Pnma. Free standing manganese stannate electrode was fabricated on paper based flexible substrate and investigated the electrochemical performances. The maximum specific capacitance and areal capacitance delivered by electrode were ∼ 183 F/g and ∼ 487 mF/cm², respectively, at the current density of 0.2 A/g, with an excellent capacitance retention ∼ 93% for 10³ cycles at 0.6 A/g. A symmetric supercapacitor was fabricated using the MnSnO₃ as active material on positive and negative electrodes in solid state gel electrolyte configuration. The device achieved the specific capacity value ∼ 156 mAh/g at 0.1 A/g with the energy density and power density of ∼ 10 Wh/kg and ∼ 22 kW/kg, respectively, at 0.5 A/g. These results suggested that manganese stannate nanoparticles are promising candidates for high-performance supercapacitor application.