In conclusion, we have demonstrated that Mn3O4 membranes showing enhanced flexoelectricity which has promising potential as a flexible energy harvester. Flexoelectric effects in 2D materials are known to enhance other electromechanical effects of the material like piezoelectric, electrostriction and triboelectric behavior. The improved FNG performance was shown to result from improved microscopic sensitivity to macroscopic strains in accordance with dimensionality reduction. This made ultrathin Mn3O4 FNG exceed voltage output by ~700 % greater when compared to its bulk counterpart with pressure sensitiveness as high as 108 mV/kPa (< 10 N). Measurement of flexoelectric constants has always been a tedious process as it involves specific boundary conditions and precise characterization techniques. Enhanced flexoelectricity is often observed in other dimensionally reduced layered structures such as perovskites, ferroelectrics, TMDCs and metal oxides. The effects of strain gradients contribute to the sensitivity of the device making it accurate for applications in sensors and structural health monitoring devices. These results represent a promising direction for centrosymmetric metal oxides for future energy applications.