title: Preparation and electrochemical performances of carbon sphere@ZnO core-shell nanocomposites for supercapacitor applications.
abstract: Carbon sphere (CS)@ZnO core-shell nanocomposites were successfully prepared through facile low-temperature water-bath method without annealing treatment. The morphology and the microstructure of samples were characterized by transition electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. ZnO nanoparticles with several nanometers in size decorated on the surface of the carbon sphere and formed a core-shell structure. Electrochemical performances of the CS@ZnO core-shell nanocomposites electrodes were investigated by cyclic voltammetry (CV) and galvanostatic charge/discharge (GDC). The CS@ZnO core-shell nanocomposite electrodes exhibit much larger specific capacitance and cycling stability is improved significantly compared with pure ZnO electrode. The CS@ZnO core-shell nanocomposite with mole ratio of 1:1 achieves a specific capacitance of 630 F g-1at the current density of 2 A g-1. Present work might provide a new route for fabricating carbon sphere and transition metal oxides composite materials as electrodes for the application in supercapacitors.
authors.affiliation: Yunnan Province Key Lab of Micro-Nano Materials and Technology, Yunnan University, 650091 Kunming, People's Republic of China.|School of Materials Science and Engineering, Yunnan University, 650091 Kunming, People's Republic of China.
authors.forename: Xuechun
authors.initials: X
authors.lastname: Xiao
authors.affiliation: School of Materials Science and Engineering, Yunnan University, 650091 Kunming, People's Republic of China.
authors.forename: Bingqian
authors.initials: B
authors.lastname: Han
authors.affiliation: School of Materials Science and Engineering, Yunnan University, 650091 Kunming, People's Republic of China.
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.affiliation: School of Materials Science and Engineering, Yunnan University, 650091 Kunming, People's Republic of China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Wang
authors.affiliation: Yunnan Province Key Lab of Micro-Nano Materials and Technology, Yunnan University, 650091 Kunming, People's Republic of China.|Department of Physics, Yunnan University, 650091 Kunming, People's Republic of China.
authors.forename: Yude
authors.initials: Y
authors.lastname: Wang