Shape-controlled synthesis of MnCO3 nanostructures and their applications in supercapacitors

Abstract

MnCO₃ nanospheres and nanocubes have been successfully synthesized by a facile precipitation method utilizing ethylene glycol. When these MnCO₃ samples were employed as electrodes in the pseudocapacitor with an aqueous NaClO₄ electrolyte, they exhibited excellent supercapacitor characteristics. The MnCO₃ nanospheres showed a specific capacitance of 129 F g⁻¹ at 0.15 A g⁻¹, while the nanocube electrode had a specific capacitance of 91 F g⁻¹ at the same current density. The as-prepared MnCO₃ electrode materials had a high retention of 87% and 92% after 1000 cycles at 0.3 A g⁻¹, indicating a high-rate electrochemical cycling life. This study has highlighted the promising prospects of MnCO₃ as a novel electrode material used for supercapacitors.