Interconnected hierarchical NiCo2O4 microspheres as high-performance electrode materials for supercapacitors

• DOI: 10.1039/c7dt01289f
• Publication Date: 2017-06-21T09:34:22Z
• Authors: Ming Cheng; Hongsheng Fan; Yuanjun Song; Yimin Cui; Rongming Wang
• Keywords: Power density

Herein, interconnected hierarchical NiCo2O4 microspheres (IH-NiCo2O4) were prepared via a solvothermal method followed by an annealing treatment. IH-NiCo2O4 possesses large tunnels and abundant mesopores, which are in favor of their applications energy storage field. When employed as electrode material for supercapacitors, exhibits high specific capacitance 1822.3 F g-1 at current density 2 A g-1, excellent rate property 68.6% capacity retention 20 87.6% its initial value after 7000 cycles 10 superior to those IH-Co3O4. Furthermore, optimal asymmetric supercapacitor (ASC) was also constructed with the positive graphene negative electrode. The ASC delivers 39.4 Wh kg-1 power 800 W kg-1. Even 8000 kg-1, still reaches 27.2 Moreover, shows good cycling stability 80.1% 5000 6 g-1. electrochemical performance makes it promising