Facile combustion synthesis of Granular-like La1-xSrxMnO3 Perovskites as electrode material for supercapacitor application

Abstract

This study focuses on synthesizing a series of perovskite-type La1-xSrxMnO3 materials using a solution combustion method to investigate the impact of varying concentrations of La and Sr. The samples were prepared with different La and Sr concentrations (La1-xSrxMnO3, X = 0, 0.2, 0.4, 0.6, and 0.8) and labeled as LSMO-2 (La0.8Sr0.2MnO3), LSMO-3 (La0.6Sr0.4MnO3), LSMO-4 (La0.4Sr0.6MnO3), LSMO-5 (La0.2Sr0.8MnO3. The structural, morphological, and compositional characteristics of the synthesized electrodes were thoroughly analyzed. X-ray diffraction (XRD) confirmed the formation of a rhombohedral structure with an R-3c space group, while Fourier-transform infrared spectroscopy (FT-IR) verified the presence of all functional groups in the samples. Field emission scanning electron microscopy (FE-SEM) revealed a cluster of nanopowder morphology, and compositional analysis further validated the formation of the prepared samples. The electrodes were then screen-printed onto Ni-foam and evaluated for their electrochemical performance. Notably, the La1-xSrxMnO3 electrode demonstrated a high specific capacitance of 1271.5 F/g at a current density of 10 mA/cm2 and maintained 83.45 % cyclic stability after 10,000 cycles. Moreover, the power law was employed to investigate the charge storage mechanism of the LMSO-4 electrode. To assess the practical application potential of the La1-xSrxMnO3 electrode, a solid-state supercapacitor device was fabricated, and its performance was investigated. The device achieved a maximum specific capacitance of 206 F/g at 5 mA, with an energy density of 16 Wh/kg and a power density of 2400 W/kg, retaining 94 % of its performance after 5000 cycles. Overall, La1-xSrxMnO3 electrodes show great promise as materials for supercapacitor applications due to their impressive electrochemical properties.