Pure flower-like NiCoMn layered double hydroxide (LDH) and 3D-architectured NiCoMn LDH/reduced graphene oxide (rGO) composite are fabricated by a solution method. The NiCoMn hydroxide nanoflakes are tightly deposited on the surface of rGO. Electrochemical measurements prove that rGO can greatly improve its capacitive performances, compared with the pure counterpart. A high-specific capacitance of 912 F g(-1), high-rate capability and long cycle life are achieved for the composite. A NiCoMn LDHIrG011activated carbon hybrid capacitor is also fabricated. It possesses a high-specific capacitance of 206 F g(-1) and an energy density of 92.8W h kg(-1) in 1.8 V. (C) 2015 Elsevier B.V. All rights reserved.