Hydrothermal-deposition synthesis of MnO2/MnS nanorods as high-performance asymmetric supercapacitor positive electrode materials

Nanostructuring has shown promise in enhancing the performance of MnO2 for energy storage in supercapacitors, highlighting its technological significance. This study introduces an innovative synthesis method, employing hydrothermal and constant-pressure deposition techniques, to produce nanostructured MnO2/MnS rod electrodes on nickel foam. The roded heterostructure enhances specific surface area, conductivity, and symbiotic effect between MnO2 and MnS. With optimized material and structural advantages, the electrode reaches a capacitance of 977.6 F g(-1) at 1 A g(-1), demonstrating extended cycling lifespan. Using MnO2/MnS-5h rods as the positive electrode and activated carbon as the negative electrode, the supercapacitor achieves an energy density of 122.23 Wh kg(-1) at 898.75 W kg(-1). Notably, it maintains 91.55 % capacity retention after 5000 cycles at 10 A g(-1), indicating outstanding cycling stability. This research presents a promising solution for efficient energy storage, emphasizing the potential application of the developed MnO2/MnS based supercapacitor in high-performance energy storage systems.