Abstract
In this work, a unique Ppy@NiCo2S4 core-shell heterostructure material is prepared taking polypyrrole (Ppy) nanotubes as skeleton through a simple and environmentally friendly hydrothermal method. The heterostructured structure with Ppy nanotubes (NTs) as the core and intertwined flake-like NiCo2S4 as the outer shell, holds a large specific surface area (217m2g−1), convenient charge transport channel, high specific capacitance (908.1Fg−1 at a current density of 1Ag−1), and excellent cycling performance (87.7% of initial value is retained after 2000 cycles). What’s more, an asymmetric supercapacitor is fabricated by employing Ppy@NiCo2S4 core-shell heterostructured material as positive and nitrogen-doped carbon nanotubes (N-C NTs) as negative electrode. This Ppy@NiCo2S4//N-C asymmetric supercapacitor effectively provides a high energy density over 50.82Whkg−1 with a high power density of 160Wkg−1 and preeminent cyclic stability of 126.6% after 2000 cycles. Due to the introduction of one-dimensional flexible Ppy inner core, as-designed the core-shell heterostructure composite may be promising in the flexible energy storage devices.
Published Version
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