Engineering the Hierarchical Heterostructures of Zn-Ni-Co Nanoneedles Arrays@Co-Li-LDH Nanosheets Core-Sheath Electrodes for Hybrid Asymmetric Supercapacitor with High Energy Density and Excellent Cycle Stability
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초록
내용
A 3D hierarchical zinc-nickel-cobalt (ZNCO)@Co-Ni-LDH (LDH-1 and LDH-2) core-shell nanostructured arrays on Ni foam as pseudocapacitive electrodes are prepared by using facile hydrothermal and metal organic framework (MOF) assisted co-precipitation method. FE-SEM images shows that the core 1D ZNCO and shell 2D Co-Ni-LDH are well interconnected to form a 3D porous and hierarchical ZNCO@Co-Ni-LDH core-shell nanostructures, leading to the fast and efficient transmission/transfer of both electrolyte ions and electrons, due to the higher electroactive surface areas and enhanced electrical conductivity. In a conventional three-electrode system, the ZNCO@Co-Ni-LDH-2 electrode material displays excellent electrochemical performance with higher specific capacitance of 2866 F g−1 at 1 A g−1 with ultra-high capacitance retention of 68.35% at higher current density of 10 A g−1 and excellent life span of 89% capacitance retention after 8000 cycles.