Engineering of hierarchical NiCoSe2@NiMn-LDH core-shell nanostructures as a high-performance positive electrode material for hybrid supercapacitors

Abstract

The development of electrode materials with hierarchical nanostructures has 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 nickel foam as an interesting positive electrode material for hybrid supercapacitors. 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 mA h g⁻¹, a considerable durability of 96.8%, and a notable rate performance of 83.6%. Most significantly, the as-assembled NCSe@NMLDH//AC (activated carbon) device exhibits a desired energy density of 47 W h kg⁻¹ at 810.34 W kg⁻¹ and an excellent power density of 25 690.9 W kg⁻¹ at 28.26 W h kg⁻¹. Therefore, the present research offers an efficient approach to engineer advanced materials for various applications.