title: Preparation of layered graphene and tungsten oxide hybrids for enhanced performance supercapacitors.
abstract: Tungsten oxide (WO3), which was originally poor in capacitive performance, is made into an excellent electrode material for supercapacitors by dispersing it on graphene (Gr). The obtained Gr-WO3hybrids are characterized by X-ray diffraction, Raman spectroscopy, high-resolution transmission electron microscopy and scanning electron microscopy techniques, and evaluated as electrode materials for high-performance supercapacitors by cyclic voltammetry, galvanostatic charge-discharge curves and electrochemical impedance spectroscopy. A great improvement in specific capacitance is achieved with the present hybrids, from 255 F g-1for WO3nanoparticles to 580 F g-1for Gr-WO3hybrids (scanned at 1 A g-1in 2 M KOH over a potential window of 0 to 0.45 V). The Gr-WO3hybrid exhibits an excellent high rate capability and good cycling stability with more than 92% capacitance retention over 1000 cycles at a current density of 5 A g-1. The enhancement in supercapacitor performance of Gr-WO3is not only attributed to its unique nanostructure with large specific surface area, but also its excellent electro-conductivity, which facilitates efficient charge transport and promotes electrolyte diffusion. As a whole, this work indicates that Gr-WO3hybrids are a promising electrode material for high-performance supercapacitors.
authors.affiliation: College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China.
authors.forename: Ling-Li
authors.initials: LL
authors.lastname: Xing
authors.affiliation: College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang 464000, China. kejinghuang@163.com.
authors.forename: Ke-Jing
authors.initials: KJ
authors.lastname: Huang
authors.affiliation: College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China.
authors.forename: Lin-Xia
authors.initials: LX
authors.lastname: Fang