Low consumption design of hollow NiCo-LDH nanoflakes derived from MOFs for high-capacity electrode materials

Abstract

A low consumption and facile method was employed to prepare hollow nickel–cobalt-layered double hydroxide (NiCo-LDH) nanoflakes grown in situ on nickel foam in deionized water at room temperature. By using MOFs (Metal–organic frameworks) as the precursor and then adjusting the Ni2+ ion exchange reaction time, the surface morphology and electrochemical performance of NiCo-LDH electrode materials can be greatly optimized. NiCo-LDH nanoflakes with a thickness of 150 nm as electrode material have a high specific capacity of 2148 F/g at the current density of 1 A/g and possess cycling stability of 82% capacity retention after 1000 cycles. This study provides a prominent approach for fabricating hollow nanomaterials with three-dimensional structures, and its excellent electrochemical performances make it a promising candidate for low energy consumption and high-performance energy storage devices.