Hollow nanostructure boosts the surface capacitive charge storage of NiCo-LDH derived from metal-organic framework for high performance asymmetric supercapacitor

•Two Ni Co-LDH nanostructures (hollow nanocage and sea urchin) were obtained by tuning the reaction temperature.•Hollow Ni Co-LDH exhibits an enhanced specific capacitance and rate capability than that of sea urchin shape product.•A much more capacitive charge storage behavior of hollow Ni Co-LDH than sea urchin-shaped product is demonstrated. Layered double hydroxide (LDH) has great potential as advanced electrode material for supercapacitor. In this paper, by tuning the reaction temperature, two Ni Co-LDH nanostructures (hollow nanocage and sea urchin) were synthesized through the hydrolysis etching process of ZIF-67 crystals and Ni2+ ions. It has been found that the morphology of the electrode material has a great influence on the electrochemical performance and analysis the reason of this behavior is essential for understanding the morphology-related electrochemical performance. Here, a much more capacitive charge storage behavior of hollow Ni Co-LDH than that of sea urchin-shaped product is demonstrated by electrochemical kinetic analysis. The higher capacitive behavior of hollow Ni Co-LDH suggests a rapid surface redox reaction during the electrochemical process, which will lead to excellent electrochemical properties. An asymmetric supercapacitor assembled using hollow NiCo-LDH as the positive electrode displays a high energy density of 88.6 Wh kg−1 at 749.9 W kg−1, further demonstrating its great application potential. These results provide insights into the reasons for the excellent electrochemical performance of hollow nanostructure.