Hybrid nanocomposites (NCs) of Mn₃O₄ nanorods and 2D materials (MoS₂ or graphene) nanosheets are successfully deposited on nickel foam porous substrate at room temperature using a one-step kinetic spray process in low-vacuum conditions. Mn₃O₄ -based NCs are utilized for the electrocatalytic detection of H₂O₂ in 0.1 M NaOH. The synergy improvement between the Mn₃O₄ nanorods and either MoS₂ or graphene nanosheets improved the non-enzymatic detection of H₂O₂. All modified electrodes exhibit a wide linear detection range from 0.2 to 1 mM.  The working electrodes with Mn₃O₄ nanorods reveal high sensitivity of 2320 mA·mM^-1·cm ^-2 toward H₂O₂ reduction. The hybridization between  Mn₃O₄ nanorods and either MoS₂ or graphene enhances the electrocatalytic reduction sensitivity to 3220 or 5400 mA·mM^-1·cm^-2, respectively. Furthermore, the modified electrodes with the Mn₃O₄-2D material hybrid NCs exhibited high electrocatalytic reduction selectivity for H₂O₂ in 0.1 M NaOH compared with other interfering species.