Preparation and electrochemical performance of multilayered Ni(OH)2 nanoflakes with different orientations uniformly anchored on reduced graphene oxide sheets

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.