Innovative synthesis strategies for Rambutan-shaped CuNiO₂ electrodes in high-performance supercapacitors

The shape/morphology of materials is critical for energy storage, especially in supercapacitors, as it affects their efficiency. The unique Rambutan-shaped CuNiO₂ material shows promise for supercapacitors due to its tailored properties. This study stands out for synthesizing the Rambutan-like CuNiO₂ structure, further improved by adding Mn, which changes its composition. Using a single-step hydrothermal technique, Mn-doped CuNiO₂ (Mn–CuNiO₂) is successfully made, with X-ray diffraction (XRD) used to identify phases. High-Resolution Transmission Electron Microscopy (HRTEM) reveals the detailed hexagonal-like architecture of Mn–CuNiO₂, shedding light on its nano structural attributes. Brunauer-Emmett-Teller (BET) analysis adds insights into the material's surface characteristics. The electrochemical performance of the Mn–CuNiO₂ electrode is thoroughly examined through galvanostatic charge/discharge experiments and cyclic voltammetry, demonstrating its high specific capacitance. Remarkably, the electrode shows a specific capacitance of 1870 F/g at a current density of 1 A/g, highlighting its effectiveness in energy storage. Additionally, the electrode material displays commendable cyclic stability, maintaining superior performance over 10,000 cycles. This durability emphasizes the importance of improving electrode materials to enhance the efficiency and lifespan of supercapacitors, meeting the growing demand for sustainable energy storage solutions.