MOF-derived microstructural interconnected network porous Mn2O3/C as negative electrode material for asymmetric supercapacitor device

Abstract

A metal–organic framework is employed for the preparation of an interconnected network porous structure of Mn₂O₃/carbon for supercapacitor applications. X-ray diffraction patterns indicate the crystal structure of the Mn₂O₃/carbon composites. Morphological studies reveal the formation of a carbon interconnected network porous structure of the prepared samples. X-ray photoelectron spectroscopy and energy-dispersive X-ray analysis confirm the carbon coating on the Mn₂O₃ particles. Three-electrode measurements showed that the prepared Mn₂O₃/C composite is suitable for asymmetric supercapacitor device fabrication, since the negative electrode exhibits a highest specific capacitance of 776 F g⁻¹ at a specific current of 1 A g⁻¹. The symmetric device yields a specific cell capacitance of 122 F g⁻¹ at a specific current of 2.5 A g⁻¹. The asymmetric device yields a maximum specific energy capacity of 54.9 W h kg⁻¹ at a power capacity of 2245 W kg⁻¹.