The electrochemical performance of perovskite LaMnO3

Abstract

Perovskite oxides have attracted as promising electrode materials for supercapacitors because of their unique structure, compositional flexibility, and inherent oxygen vacancy. In the present work, LaMnO3(LMO) perovskites are synthesised by microwave assisted chemical coprecipitation and followed by calcination at 750 ˚ C. The crystal structure and the presence of functional groups in LaMnO3 were studied through X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The surface morphology was characterized by field emission scanning electron microscopy (FESEM). Electrochemical performance of LMO electrodes is evaluated in 3M KOH and 3M NaOH electrolytes. The specific capacitance of the LMO electrode in 3M NaOH and 3M KOH electrolyte were calculated to be 557.76 F/g and 290.63 F/g at scan rate of 5mV/s. The enhancement in the specific capacitance of the LMO electrode in 3M NaOH can be attributed to the effective charge storage mechanism.