Sonochemical synthesis of Co₂SnO₄ nanocubes for supercapacitor applications

In this work, a simple sonochemical route was followed to synthesize cobalt stannate (Co₂SnO₄) nanocubes using stannous and cobalt chlorides as the precursors in alkaline medium at room temperature. The structure, composition and surface morphology of synthesized Co₂SnO₄ nanocubes have been characterized by using X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR), Field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM) indicates that the Co₂SnO₄ nanocubes are crystalline, single-phase without any impurity phase; the sizes of nanocubes are ∼100 nm. The cyclic voltammetry, galvanostatic charge-discharge cycling test, and electrochemical impedance spectroscopy (EIS) measurements are carried out for the Co₂SnO₄ nanocubes shows a specific capacitance 237 F g^-1 at 0.5 mA cm^-2 current density and in 1 M Na₂SO₄ electrolyte. Co₂SnO₄ nanocubes exhibit long cycling life with 80% retention of initial capacitance after 2000 cycles and the excellent rate capability at 15 mA cm^-2 as much as 70% of that at 0.5 mA cm^-2 suggest its potential use for supercapacitor applications.