In this study, flower-shaped NiO/α-Ni(OH)2 hybrid structures were synthesized by a solvothermal process. The microstructure, surface morphology, and surface area of the synthesized materials were characterized by XRD, SEM, and BET. It was discovered that this unique hybrid structure exhibits outstanding capacitive performance in basic electrolyte. From galvanostatic charge–discharge test, the hybrid composite itself demonstrates a solid capacitance value of 707F/g at 2A/g and 474F/g at a high discharge rate of 10A/g. In order to further improve the performance and the capacitance retention with enhanced current density, carbon nanomaterials were used as supports for the NiO/α-Ni(OH)2 hybrid. These carbon nanomaterials are believed to form conductive network around NiO/α-Ni(OH)2 flowers. The effects of 4 different carbon nanomaterial supports, including carbon black, carbon nanotubes, and graphene, were thoroughly investigated, and specifically the addition of single-walled carbon nanotubes to the composite significantly enhanced the performance to 810F/g at a high current discharge of 10A/g. Moreover, this carbon supported hybrid composite exhibits an impressive specific power density of 7200W/kg and a steady energy density of 21Wh/kg.