Porous ternary TiO2/MnTiO3@C hybrid microspheres as anode materials with enhanced electrochemical performances
Porous ternary TiO2/MnTiO3@C hybrid microspheres as anode materials with enhanced electrochemical performances
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DOI：
10.1039/c5ta06437f
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发表时间：
2015-01-01
影响因子：
11.9
通讯作者：
Guo, Zhanhu
中科院分区：
文献类型：
--
作者：
Guo, Shimei;Liu, Jiurong;Guo, Zhanhu
采用浸渍法将Mn 2+离子注入到多孔TiO 2中，然后进行热处理，成功制备了多孔TiO 2/Mn 3 O 4纳米复合微球。通过对吡咯包覆的多孔TiO 2/Mn 3 O 4微球进行碳化处理，得到了碳包覆TiO 2和MnTiO 3（TiO 2/MnTiO 3@C）三元杂化复合材料，其比表面积为40.0m2 g-1。在孔的表面和内壁上沉积了厚度为1- 2nm的碳涂层。电化学测试表明，所制备的TiO 2/MnTiO3@C多孔电极材料在100 mA·g（-1）电流密度下循环300次后的可逆容量为402.6 mA·h·g（-1），在100 mA·g（-1）电流密度下的容量分别为259.8、237.3、200.4、150.5和103.3 mA·h·g（-1），200、400、800和1600 mA g（-1）。MnTiO 3/TiO2@C多孔复合材料表现出上级的循环和倍率性能，这是由于在充放电过程中TiO 2基体体积变化小、MnTiO 3的高容量和碳涂层的良好导电性所产生的协同效应。
Porous TiO2/Mn3O4 nanocomposite microspheres have been successfully fabricated through impregnating Mn2+ ions into the lab-made porous TiO2, followed by an annealing process. The carbon-coated TiO2 and MnTiO3 (TiO2/MnTiO3@C) ternary hybrid composites with a specific surface area of 40.0 m(2) g(-1) were obtained by carbonizing the pyrrole coated porous TiO2/Mn3O4 microspheres. The carbon coating with a thickness of 1-2 nm was deposited on the surface and inner wall of pores. Electrochemical tests demonstrated that the as-prepared TiO2/MnTiO3@C porous electrode materials possessed a reversible capacity of 402.6 mA h g(-1) after 300 cycles at a current density of 100 mA g(-1) and the capacities of 259.8, 237.3, 200.4, 150.5 and 103.3 mA h g(-1) at the current densities of 100, 200, 400, 800, and 1600 mA g(-1). The MnTiO3/TiO2@C porous composites exhibited superior cycling and rate performances, arising from the synergistic effect that was created by little volume variation of the TiO2 matrix, high capacity of MnTiO3 and good electrical conductivity of the carbon coating during the charge/discharge processes.