Enhancing Energy Storage: A Straightforward Method for Designing High-Performance Supercapacitor Electrodes Using Co-Mn/Co₃O₄-MnO₂ Core/Shell Nano-Heterostructures

This paper illustrates the process for creating innovative Nano-Heterostructures (NHs) and compares how well they perform electrochemically when used as Supercapacitor (SCs) electrodes. The created SCs electrodes for Co-Mn core/shell and Co-Mn/Co₃O₄-MnO₂ core/shell NHs offer the requisite macroporosity to facilitate electrolyte flow, hence lowering device resistance and nanoporosity with large surface area to enable quicker reaction kinetics. Co-Mn core/shell and Co-Mn/ Co₃O₄-MnO₂ core/shell SCs electrodes both displayed specific capacitance values (731 and 2013 F g-1, respectively, at a constant current density of 2.5 A g-1), high energy (36.5 and 44.7 Wh kg-1, respectively), power density (7.5 and 5.6 kW kg-1, respectively), good capacitance retention, and long cyclicality in a three-electrode configuration. Based on the efficient nano-architectural design of the electrode and the coexistence of highly redox active materials at the surface supported by highly conducting metal channels at the core for faster charge transport, the remarkable electrochemical property of the large surface area NHs is demonstrated.