PVP辅助水热法制备Fe_2O_3/石墨烯纳米复合材料

Preparation of Fe_2O_3/graphene nanocomposites by PVP-assisted hydrothermal method

纳米结构过渡金属氧化物与石墨烯的复合材料,已被证明是高可逆比容量和优异循环稳定性的新型锂离子电池负极材料之一,其制备工艺尤为重要。以九水硝酸铁、氧化石墨为原料,采用PVP辅助水热法制备Fe_2O_3/石墨烯纳米复合材料,探讨水热反应温度、反应时间条件对Fe_2O_3结构的影响,利用XRD和TEM对样品结构及形貌进行表征。结果表明:水热反应的最佳条件是温度为160℃、时间为12 h,制备得到Fe_2O_3粒径大小约为34砌,结晶度高,且均匀地分散在石墨烯表面。

This paper underscores the importance of the technology designed for preparing the transition metal oxides and graphene nanocomposite,an anode material of lithium-ion battery found to high reversible specific capacity and good cycling stability.The paper introduces the study process,including preparation of Fe2O3/graphene nanocomposites from graphite oxide and Fe（NO3）3· 9H2O as raw materials by using PVP-assisted hydrothermal method,investigation into the influences of reaction time and reaction temperature on the Fe2O3 structure,and characterization of the structures and morphologies by X ray diffracmeter and transmission electron microscopy.The optimum hydrothermal conditions marked by the temperature of 160 ℃ and the reaction time of 12 h afford Fe2O3 nano particles with a particle size of about 34 nm and good crystallization,which are dispersed uniformity on the surface of graphene.