▎ 摘　　要

There is an ever-growing demand for developing environment-friendly and cost-effective approach to synthesize high-performance supercapacitor electrode materials. This work proposes a facile, rapid and environmentally friendly strategy to prepare NiCo-layered double hydroxide/multilayer graphene composite (termed as NiCoLDH/MLG) using methods of ozone oxidation and microwave-assisted synthesis. The NiCo-LDH/MLG possesses a distinctive 3D petal-like porous architecture, which endows a high specific capacitance of 1212.75 F.g(-1) at the current density of 1 A.g(-1) in a three-electrode system. Moreover, the NiCo-LDH/MLG exhibit excellent rate capability with 80.5% of the capacitance retained at 6 A.g(-1) even after 3000 cycles. In addition, the symmetrical supercapacitor based on NiCo-LDH/MLG delivered a high energy density of 23.14 Wh.kg(-1) at a power density of 1049 W.kg(-1).