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We synthesized the urchin-like NiCo2(CO3)1.5(OH)3@NiCo2S4 which has a high electrochemistry response capability and cycle stability by the ion exchange route.

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Shape-preserved NiCo2S4 was obtained from NiCo2O4via a facile anion exchange reaction (AER). The unique electrode showed excellent performance, which makes it a promising electrode for supercapacitors.

Fabrication and design of core/shell heterostructures electrodes are considered as a promising strategy to enhance the electrochemical property of the supercapacitors. In this study, we demonstrate the synthesis of the hierarchical hybrid Fe­Co2O4­@­polypyrrole core/shell nanowires via a chemical liquid process. As anode for a flexible supercapacitor, the Fe­Co2O4­@­polypyrrole core/shell nanowires display a specific capacitance of 2269 F g–1 at 1 A g–1. The specific capacitance retains 79.2% at 20 A g–1. Additionally, a flexible ASC was fabricated via combining an Fe­Co2O4­@­polypyrrole anode with an activated carbon cathode, which achieves an encouraging energy density of 68.8 Wh kg–1 (0.8 kW kg–1), and long cycle lifespan (91% over 5000 cycles). Moreover, an LED can be lighted efficiently with three devices in series. The Fe­Co2O4­@­polypyrrole core/shell nanowires electrode presents considerable potential for electrochemical energy storage.

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