A novel strategy to synthesize NiCo layered double hydroxide nanotube from metal organic framework composite for high-performance supercapacitor.

Designing porous materials with various nanoscales and dimensionalities is very significant for surface/interfacial interaction and mass transport, and are expected to improve the performance of materials. Herein, we first report the preparation of porous NiCo layered double hydroxide (NiCo LDH) nanotube by utilizing a metal organic framework (MOF) and MoO 3 composite as a precursor. The NiCo LDH nanotube is composed of two-dimension (2D) nanosheet and a high specific surface area of 107 m2 g−1 is achieved. The unique structure of nanotube and high specific surface area can greatly improve the electrical conductivity and electroactive surface area of the material and also shorten the ion transport path, resulting in enhancement of electrochemical performance. When used as electrode material for supercapacitors, the NiCo LDH nanotube shows a high specific capacitance of 1386 F g−1 at a current density of 1 A g−1. Moreover, the asymmetric supercapacitor assembled by active carbon and the NiCo LDH nanotube shows a high capacitance of 94.3 F g−1 at 0.5 A g−1, an energy density of 118 Wh kg−1 at a power density of 108 W kg−1 and excellent stability without any loss in capacitance even after 10000 charge-discharge cycles, indicating that the NiCo LDH nanotube is a very promising supercapacitor electrode material. NiCo layered double hydroxide (NiCo LDH) nanotube was synthesized and exhibited high specific capacitance and excellent ling-term stability. Image 1 • NiCo LDH nanotube was prepared by using MoO 3 @ZIF-67 as precursor for the first time. • The NiCo LDH nanotube is assembled by 2D nanosheet. • The NiCo LDH nanotube shows a high capacitance of 1386 F g−1 at 1 A g−1. • The NiCo LDH//AC shows a high capacitance of 94.3 F g−1 at 0.5 A g−1 and excellent stability. [ABSTRACT FROM AUTHOR]