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In this paper, the pseudocapacitive performance of nitrogen-doped and undoped reduced graphene oxide/tetragonal hausmannite nanohybrids (N-rGO/Mn 3 O 4 and rGO/Mn 3 O 4 ) synthesized using a one-pot hydrothermal method is reported. The nanohybrid electrode materials displayed exceptional electrochemical performance relative to their respective individual precursors (i.e., reduced graphene oxide (rGO), nitrogen-doped reduced graphene oxide (N-rGO), and tetragonal hausmannite (Mn 3 O 4 )) for symmetric pseudocapacitors. Among the two nanohybrids, N-rGO/Mn 3 O 4 displayed greater performance with a high specific capacitance of 345 F g −1 at a current density of 0.1 A g −1 , excellent specific energy of 12.0 Wh kg −1 (0.1 A g −1 ), and a high power density of 22.5 kW kg −1 (10.0 A g −1 ), while rGO/Mn 3 O 4 demonstrated a high specific capacitance of 264 F g −1 (0.1 A g −1 ) with specific energy and power densities of 9.2 Wh kg −1 (0.1 A g −1 ) and 23.6 kW kg −1 (10.0 A g −1 ), respectively. Furthermore, the N-rGO/Mn 3 O 4 nanohybrid exhibited an impressive pseudocapacitive performance when fabricated in an asymmetric configuration, having a stable potential window of 2.0 V in 1.0 M Na 2 SO 4 electrolyte. The nanohybrid showed excellent specific energy and power densities of 34.6 Wh kg −1 (0.1 A g −1 ) and 14.01 kW kg −1 (10.0 A g −1 ), respectively. These promising results provide a good substance for developing novel carbon-based metal oxide electrode materials in pseudocapacitor applications.

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