Urchin-Like Ni(2/3)Co(1/3)(CO(3))(1/2)(OH)·0.11H(2)O for High-Performance Supercapacitors

Here, we report our finding in the fabrication of novel porous urchin-like Ni(2/3)Co(1/3)(CO(3))(1/2)(OH)·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 318 C 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.