摘要
We reported a facile and robust one-pot wet chemistry strategy to achieve the growth of uniform three dimensional（3D） MoSe_2 ultrathin nanostructures on graphene nanosheets to form high quality MoSe_2/rGO hybrid nanostructures.Owing to the graphene as a support,it can significantly prevent the aggregation of MoSe_2 and the distribution of MoSe_2 on graphene was highly uniform.Importantly,due to the unique structures,the as-harvested MoSe_2/rGO hybrid exhibited excellent electrochemical performance as anode materials for sodium-ion battery（SIB）.When evaluated in a half cell system,the MoSe_2/rGO hybrid nanostructures could deliver a capacity of 200.2 mA h g^（-1） at8 A g^（-1） and maintain a capacity of 230.1 mA h g^（-1） over 100 cycles at 5 A g^（-1）.When coupled with Na_3V_2（PO_4）_3 cathode in a full cell system,the material could deliver a discharge capacity of 363.1 mA h g^（-1） at the current density of 0.5 A g^（-1）.Moreover,a discharge capacity of 56.4 mA h g^（-1） could be achieved even at a high current density of 10 A g^（-1）,which clearly suggested the high power capability of MoSe_2/rGO hybrid nanostructures for sodium ion energy storage.
本文采用一种简单有效的湿化学策略将三维MoSe_2超薄纳米结构均匀分散在石墨烯纳米片上,"一锅法"制备得到了MoSe_2/rGO纳米复合结构.石墨烯作为支撑,不但能有效防止MoSe_2的团聚,而且使MoSe_2均匀分散在石墨烯纳米片上.由于这种独特的复合结构,MoSe_2/rGO作为钠离子电池负极材料表现出优异的电化学性能.在半电池中,MoSe_2/rGO复合纳米材料在8 Ag^(-1)电流密度下提供的容量为200.2mA h g^(-1),在5A g^(-1)电流密度下循环100次,其容量可保持在230.1mA h g^(-1).当和Na_3V_2(PO_4)_3正极组成钠离子全电池,在0.5A g^(-1)的电流密度下提供的容量为200.2mAh g^(-1),即使在10A g^(-1)的高电流密度下,MoSe_2/rGO复合纳米材料仍然可以获得56.4mAh g^(-1)放电容量,表明MoSe_2/rGO纳米复合材料作为钠离子存储材料具有较高的功率密度.
基金
supported by the start-up funding from Xi'an Jiaotong University,the Fundamental Research Funds for the Central Universities(2015qngzl2)
the China National Funds for Excellent Young Scientists(21522106)
the National Natural Science Foundation of China(21371140)
