Crafting advanced supercapacitor electrodes with calcium manganese oxide in synergy with rGO and MWCNTs.

[Display omitted] Despite significant progress in developing metal oxide composite electrodes, methods to improve conductivity and integrate them with carbon nanocomposites remain scarce. Herein, we have synthesized carbon variants – metal oxide composite electrodes with reduced graphene oxide (rGO) and multi-walled carbon nanotubes (MWCNTs). This study outlines the process of synthesizing CaMn 3 O 6 microbeads (∼0.4 μm), which are dispersed within reduced graphene oxide (rGO) sheets and carbon nanotubes (CNTs). The synthesis involves a hydrothermal reaction followed by a calcination process. The synthesized samples are fabricated as a pouch type asymmetric supercapacitor device. The electrodes labelled as CMO–G and CMO–M were tested in three electrode system wherein CMO–M delivered a capacitance of 483 F/g and CMO-G delivered a capacitance of 356 F/g. Low resistance, excellent cycling stability makes CMO–M a suitable electrode for practical applications. The device CMO–M||AC delivered capacitance of 140 F/g and showed a capacity retention up to 84 % even after 20,000 cycles. CMO–M||AC device delivered energy density of 43.81 Wh kg⁻¹ at 750 W kg⁻¹ power density. Our results distinctly demonstrate the significant potential achieved through the synergistic effect in CaMn 3 O 6 and carbon variants. This understanding could prove valuable in the creation of advanced energy storage solutions. [ABSTRACT FROM AUTHOR]