3D nanoflower-like and core–shell structured MCo2O4@MCo2S4@polypyrrole (M = Cu, Mn) composites as supercapacitor electrode materials with ultrahigh specific capacitances

The flower-shaped MC@MS@PPy-16/NF (M = Cu, Mn) composite with a core–shell structure is constructed via facile hydrothermal and annealing processes followed by a chemical bath method and exhibits excellent electrochemical performance.