Table 1. Comparative Table for Specific Capacitance, Energy Density, and Power Density of the co-Doped MnO₂ Nanocomposite.

electrode material	synthesis method	capacitance	cycle stability	ref.
Co3O4@MnO2	hydrothermal	560 F g–1at current density 0.2 Ag–1	95% retention after 5000 cycles	(13)
Co3O4 nanowire@MnO2	hydrothermal	480 F g −1 at current density 2.67 Ag–1	2.7% loss after 5000 cycles	(63)
Co3O4@Pt@MnO2	nanowire arrays on the Ti substrate coating	539 F g–1at current density 1 Ag–1	No loss after 5000 cycles	(64)
Co-doped MnO2	pulse laser deposition	99 F g–1 at 5 mVs–1	-	(65)
Co3O4@MnO2 core–shell microspheres	hydrothermal	671 F g–1at current density 1 A g–1	5% loss after 2000 cycles	(66)
Co3O4@MnO2/NGO	thermal reduction process	347 F g–1 at current density 0.5A g–1	31% loss after 10,000 cycles	(67)
Co-doped MnO2	light-assisted method	350 F g–1 at current density 0.1 A g–1	10% loss after 1000 cycles	(68)
Co-doped MnO2	pulsed electrodeposition	354 F g–1 at current density 0.5A g–1	-	(69)
Co-doped MnO2	hydrothermal	1050 F g–1at current density 0.5 A g–1	8% loss after 10,000 cycles	present work