title: Designing 3D interconnected continuous nanoporous Co/CoO core-shell nanostructure electrodes for a high-performance pseudocapacitor.
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-2and 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-2at a power density of 0.001 62 W cm-2, which is far superior to that of a supercapacitor at a similar power density.
authors.affiliation: Institute of Nano-science and Technology, College of Physical Science and Technology, Central China Normal University, Wuhan, 430079, People's Republic of China.
authors.forename: Chen
authors.initials: C
authors.lastname: Qing
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhou
authors.forename: Gan
authors.initials: G
authors.lastname: Qu
authors.forename: Xinqi
authors.initials: X
authors.lastname: Chen
authors.forename: Hai
authors.initials: H
authors.lastname: Wang
authors.forename: Daming
authors.initials: D
authors.lastname: Sun
authors.forename: Bixiao
authors.initials: B
authors.lastname: Wang
authors.forename: Lifeng
authors.initials: L
authors.lastname: Xu
authors.forename: Yiwen
authors.initials: Y
authors.lastname: Tang