Hierarchical pipe cactus-like Ni/NiCo-LDH core–shell nanotube networks as a self-supported battery-type electrode for supercapacitors with high volumetric energy density

An ultrathin 3D NiCo-LDH@Ni-NTNW electrode for supercapacitors demonstrates an ultrahigh volumetric capacity and excellent cycling stability. The assembled hybrid supercapacitor delivers a record-high volumetric energy density of 14.7 mWh cm −3 .