LAUSR

Abstract Different orientations of multilayered Ni(OH)2 nanoflakes uniformly anchored on reduced graphene oxide (rGO) sheets are prepared by a facile chemical deposition method. It is found that vertically oriented Ni(OH)2/rGO has a greater specific capacitance than the horizontally oriented counterpart. The electrochemical performance of as-fabricated vertically oriented Ni(OH)2/rGO composite as cathode material for supercapacitors shows an unexceptionable specific capacitance along with high rate capability and cycling stability. As a result, the specific capacitance reaches 1770 F/g at a current density of 1 A/g in 6 M KOH solution. Furthermore, the Ni(OH)2/rGO electrode displays an ultrahigh rate capability (maintaining 864 F/g at a high current density of 50 A/g) and a super cycling stability (142.2% capacity retention after 3000 charge-discharge cycles). Such an orientation-controlled Ni(OH)2/rGO composite is thus a promising electrode material for great applications in energy storage systems.