ZnWO_4 nanocrystals/reduced graphene oxide hybrids：Synthesis and their application for Li ion batteries

ZnWO4,as an environment-friendly and economic material,has the potential for Li ion batteries（LIB）application.In this paper,a facile method has been developed to synthesize ZnWO4supported on the reduced graphene oxide（RGO）to improve its LIB performance.The cuboid-like ZnWO4nanocrystals are prepared by directly adding Na2WO4 powders into the graphene oxide/Zn aqueous solution followed by a hydrothermal treatment.The high-resolution TEM,XRD and XPS characterizations were employed to demonstrate structural information of the as-prepared ZnWO4/RGO hybrids carefully.Besides,we also discussed the LIB properties of the hybrids based on the detailed galvanostatic charge-discharge cycling tests.As a result,the specific capacity of the as-prepared ZnWO4/RGO hybrids reached more than 477.3 mA h g 1after 40 cycles at a current density of 100 mA g 1（only less than 159 mA g 1for bare ZnWO4）.During the whole cyclic process,the coulombic efficiency steadily kept the values higher than 90%.