Synthesis and Unveiling Properties of Nanocomposite NiO/Mn₂O₃ and Ni–Mn‐Based Layered Double Hydroxide as Efficient Supercapacitor Electrodes

The unique morphology achieved through the co‐precipitation method represents a rare and notable accomplishment in the current research landscape. In this work, an exclusive sphere‐like morphology of NiO/Mn 2 O 3 and layered Ni–Mn–LDH (layered double hydroxide) is synthesized successfully by the conventional coprecipitation method. NiO/Mn 2 O 3 and Ni–Mn–LDH are coated on stainless‐steel substrates and demonstrate remarkable charge–discharge performance with significantly enhanced specific capacitance. The measured specific capacitance and retention of NiO/Mn 2 O 3 is 956 F g −1 and 98.4% beyond 5000 repetitions under 3 A g −1 . Sphere morphology enhances the charge/discharge rates through ion diffusion and reduction in diffusion distance. Such morphology supports the long‐term stability of the electrode. The nickel–manganese‐based LDH electrode exhibits the measured specific capacitance and retention of 905 F g −1 under 1 A g −1 and 94.8% at 5000 cycles at 3 A g −1 , respectively. Furthermore, an asymmetric supercapacitor (SC) device, fabricated using NiO/Mn 2 O 3 , achieves an impressive specific capacitance of 171 F g −1 at 1 A g −1 and exhibits a capacitance retention of 95.83% for 10 000 cycles. Due to this excellent supercapacitive performance, these materials are highly promising candidates for next‐generation energy storage applications. The remarkable retention of capacitance over prolonged cycling underscores their durability, paving the way for their potential use in commercial SC devices.