▎ 摘　　要

A layered Ni(OH)(2)/graphene composite was firstly prepared by electrochemical deposition of nickel nanoparticles between layers of expanded graphite in Ni2+ containing solution, and then the deposited nickel nanoparticles were converted into Ni(OH)(2) via cyclic voltammetry in 6 M KOH electrolyte. Images of transmission electron microscopy show that Ni(OH)(2) particles are uniformly distributed on graphene sheets with an average diameter of 6 nm. The Ni(OH)(2)/graphene composite with an areal loading of 5 mg cm(-2) demonstrates a maximum specific capacitance of 856 F g(-1) at 1 A g(-1), and 79 % of the specific capacitance can be retained after 2000 cycles at a current density of 10 A g(-1). Commercial expanded graphite is much cheaper than activated carbon and considerably much cheaper than graphene, therefore this technique is very promising for mass production of supercapacitor electrodes.