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Multidimensional architectures of CoNi2S4 electrode materials are rationally designed by engineering the surface structure toward that of high-performance supercapacitors. The fabrication of a special morphology is highly dependent on the synergistic effect between the guidance of Co–Ni precursor arrays and a subsequent sulfidation process. The unparalleled CoNi2S4 electrode materials (NS-3) deliver a significantly enhanced specific capacitance (3784.6 F g−1 at 3 A g−1), accompanied by an extraordinary rate capability (2932.3 F g−1 at 20 A g−1) and excellent cycling life. The outstanding supercapacitor performance stated above stems from the advantages of a multidimensional structure generated by crosslinking 2D microsheets/1D nanowires/2D ultrathin nanosheets; this structure supplies additional efficient active sites and a large contact area at the electrode–electrolyte interface, providing faster transport kinetics for electrons and ions. For practical applications, asymmetric devices based on an NS-3 positive electrode and active carbon negative electrode exhibit a high energy density of 38.5 W h kg−1 accompanied by a power density of 374.9 W kg−1 (22 W h kg−1 at 7615.4 W kg−1). The above results indicate that the design of multidimensional Co–Ni–S materials is an effective strategy to achieve a high-performance supercapacitor.

Multidimensional structure of CoNi2S4 materials: structural regulation promoted electrochemical performance in a supercapacitor

Multidimensional structure of CoNi₂S₄ materials: structural regulation promoted electrochemical performance in a supercapacitor