One-Dimensional/Two-Dimensional Homo-Orientation Co<sub>3</sub>O<sub>4</sub>/NiCo<sub>2</sub>O<sub>4</sub> Nanoarray toward Ultrastable Hybrid Supercapacitor
Chunli Guo, Huaiyan Wang, Yanzhen Liu, Yuyu Zhang, Suxia Cui, Zhen Guo, Canliang Ma
Abstract
We synthesized 1D/2D homo-orientation Co3O4/NiCo2O4 composites vertically on nickel foam. This vertical structure can greatly improve the electron transmission rate and material conductivity. So, the Co3O4/NiCo2O4 composites display good rate capability and long-term cycling stability. The composites retain 82% of the initial retention rate at 20 mA cm–2 after 20,000 cycles. In addition, the supercapacitor device using Co3O4/NiCo2O4 as positive materials not only can exhibit excellent 89% of the capacity retention after 20,000 cycles at 1 A g–1 but also deliver a maximum energy density of 22 W h kg–1 and a maximum power density of 2.25 kW kg–1. These results indicate that Co3O4/NiCo2O4 is a hopeful electrode material for high-performance supercapacitor applications.