Microstructural tailoring for enhanced response of carbon nanotube-filled BiMnO₃ electrodes

Growing demands for efficient energy storage have cultivated the scientific community to introduce novel electrode materials for energy storage devices. In this view, we fabricated a novel electrochemically efficient perovskite series of BiMnO₃ incorporated with different weight percentages (0, 3, 6, and 9 %) of CNTs and categorized as BMO, BMO-I, BMO-II, and BMO-III, which may be utilized as efficient electrode material in supercapacitors to meet energy requirements. This was accomplished by synthesizing BiMnO₃ via an economically facile hydrothermal process, and then BiMnO₃/CNTs composites were prepared by a solvothermal approach. The monoclinic structure of BMO was affirmed through the XRD survey, along with electrochemically efficient morphological features found indicating the wrappings of nanoparticles around the CNTs. A comprehensive electrochemical investigation revealed different redox peaks in cyclic voltammetry curves at various scan rates, indicating hybrid behavior. The composite BMO-Ⅲ outperformed other composite samples with a specific capacity of 355 C/g at a lower scan rate of 2.5 mV/s using cyclic voltammetry. The GCD analysis showed that BMO-Ⅲ exhibits a maximum specific capacity of 117 C/g, energy, and power densities of 8.17 Wh/kg and 5000 W/kg. Moreover, the BMO-III ion transport properties such as charge transfer resistance (0.68 Ω), diffusion coefficient (3.45 × 10⁻¹⁸ m²/s), ionic conductivity (0.978 × 10⁻³ S/cm), and transference number (0.31) attributed to the highest content of CNTs (9 %) and outstanding capacity retention of 78.62 %, suggesting enhanced electrochemical response of BMO-III based electrode material. The electrode BMO-Ⅲ demonstrated improved surface capacitive charge storage, making it a promising choice for electrode materials.