▎ 摘　　要

Amorphous Ni (OH)(2) nanobox-like materials were synthesized using Cu2O as template. Ni (OH)(2)/reduced graphene oxide (Ni (OH)(2)/rGO) composites were prepared by a simple hydrothermal method. The results obtained from field emission scanning electron microscopy and transmission electron microscopy indicated that the Ni (OH)(2) nanobox structure broke into small pieces of 50-100nm under high temperature and high pressure during the hydrothermal process, and successfully covered the entire graphene surface. Electrochemical studies showed that a specific capacitance of 626.84Fg(-1) was obtained at a current density of 1Ag(-1). When the current density increased from 1 to 5Ag(-1), the capacitance retention rate reached 50%. After 2000 consecutive charge-discharge cycles, the capacitance of Ni (OH)(2)/rGO composite decreased 30% of initial capacitance compared to 55% for pure Ni (OH)(2). The rational design, interesting structure, and ideal electrochemical performance of this graphene-based composite indicate its potential application in high-energy storage systems.