Urchin-Like Ni2/3Co1/3(CO3)1/2(OH)•0.11H2O for High-Performance Supercapacitors

Here, we report our finding in the fabrication of novel porous urchin-like Ni2/3Co1/3(CO3)(1/2)(OH)center dot 0. 11H(2)O (denoted as NC) nanomaterial composed of numerous nanoneedles through an one-step hydrothermal method, which deliveres a high specific capacity of 318C g(-1) at a current density of 1 A g(-1). Moreover, an architectural composite electrode consisting of the porous NC nanoneedles wrapped by reduced graphene oxide (rGO) nanosheets exhibits large specific capacity (431 C g(-1) at 1 A g(-1)), high rate capability and long cycling life (94% capacity retention after 5,000 cycles at 20 A g(-1)). The presence of rGO in the composite electrode greatly improves the electronic conductivity, providing efficient current collection for fast energy storage.