Designing 3D interconnected continuous nanoporous Co/CoO core–shell nanostructure electrodes for a high-performance pseudocapacitor. (18th January 2017)

• Record Type: Journal Article
• Authors: Qing, Chen; Zhou, Qin; Qu, Gan; Chen, Xinqi; Wang, Hai; Sun, Daming; Wang, Bixiao; Xu, Lifeng; Tang, Yiwen
• Is Part Of: Nanotechnology. Volume 28:Number 8(2017)
• Publication Date: 2017-01-18
• Subjects: CoO -- Co/CoO -- core/shell -- nanoporous -- asymmetric supercapacitor; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/aa53be
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: A high-performance supercapacitor electrode is designed and fabricated with the 3D interconnected continuous nanoporous Co/CoO core–shell hybrid nanostructure grown on nickel foam. The Co/CoO core–shell hybrid nanostructures are obtained via a hydrothermal method, followed by high-temperature annealing in hydrogen atmosphere, and finally placed in air at 50 °C for 1 h. The Co/CoO core–shell nanostructure assembled by a conductive metal–core and a CoO shell, brings low resistance, high specific capacitance of 5.632 F cm −2 and good capability stability (81.5% capacitance retention after 6000 cycles). An asymmetric supercapacitor device built by the Co/CoO (positive electrode) and activated carbon (negative electrode) can deliver a working voltage of 1.7 V and display a high energy density of 0.002 67 Wh cm −2 at a power density of 0.001 62 W cm −2, which is far superior to that of a supercapacitor at a similar power density.