Engineering of Hierarchical NiCoSe2@NiMn-LDH Core-Shell Nanostructures as a High-Performance Positive Electrode Material for Hybrid Supercapacitors

2020 
The development of electrode materials with hierarchical nanostructures has a great significance in the field of supercapacitors. In the present research, an effective hydrothermal approach is proposed to construct hierarchical NiCoSe2@NiMn-LDH (NCSe@NMLDH) core-shell structures on the nickel foam as an interesting positive electrode material for hybrid supercapacitor. The intimate contact between NiCoSe2 and NiMn-LDH nanostructures together with the hierarchically porous structure enables the NCSe@NMLDH electrode to exhibit an excellent capacity of ≈401.7 mAh g−1, considerable durability of 96.8%, and notable rate performance of 83.6 %. Most significantly, the as-assembled NCSe@NMLDH//AC (activated carbon) device indicates a desired energy density of 47 Wh kg−1 at 810.34 W kg−1 and an excellent power density of 25690.9 W kg-1 at 28.26 Wh kg-1. Therefore, the present research offers an efficient approach to engineer advanced materials for various applications.
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