Superior Performance Asymmetric Supercapacitors Based on a Directly Grown Commercial Mass 3D Co3O4@Ni(OH)2 Core–Shell Electrode

• DOI: 10.1021/am402436q
• Publication Date: 2013-10-03T16:35:59Z
• Authors: Chun-hua Tang; Xuesong Yin; Hao Gong
• Keywords: Power density; Pseudocapacitor

Pseudocapacitors based on fast surface Faradaic reactions can achieve high energy densities together with power densities. Usually, researchers develop a thin layer of active materials to increase the density by enhancing area; meanwhile, this sacrifices mass loading. In work, we developed novel 3D core–shell Co3O4@Ni(OH)2 electrode that provide very Core–shell porous nanowires (Co3O4@Ni(OH)2) were directly grown Ni current collector as an integrated electrode/collector for supercapacitor anode. This nanoarchitectured exhibits ultrahigh areal capacitance 15.83 F cm–2. The asymmetric prototypes, assembled using anode, reduced graphene oxide (RGO) or carbon (AC) cathode, and 6 M aqueous KOH electrolyte, exhibit falling into energy-density range Li-ion batteries. Because large loading density, prototypes drive minifan light bulb even though size is small. These results indicate our supercapacitors have outstanding potential in commercial applications. Systematic study scientific understanding carried out.