MoS_2/石墨烯基复合材料的制备及其电化学性能
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摘要
以氧化石墨烯、钼酸钠、硫代乙酰胺和葡萄糖为原料,通过水热法原位合成MoS_2/石墨烯基复合材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等一系列的表征测试手段研究了MoS_2/石墨烯基复合材料的形貌及材料结构特性。通过对组装的MoS_2//Li半电池进行循环伏安测试和充放电测试,研究了MoS_2/石墨烯基复合材料的电化学性能。半电池测试结果显示,MoS_2/石墨烯基复合材料第一次放电比容量和第一次充电比容量分别可达863和717 mAh/g,在经过200次循环以后,其比容量仍可达到432 mAh/g。
The MoS_2/graphene composite material was prepared in situ through hydrothermal process using graphene oxide, sodium molybdate, thioacetamide and glucose as precursors. The morphologies and structural characteristics of the MoS_2/graphene composite were studied by SEM, XRD and XPS. The electrochemical properties of MoS_2/g raphene composite were evaluated by cyclic voltammetry and galvanostatic charge-discharge test using MoS_2//Li half-cells. The first cycle discharge and charge capacity of MoS_2/graphene composite were 863 and 717 mAh/g,respectively. After 200 cycles, the MoS_2/graphene composite can retain a relatively high specific capacity of 432 mAh/g.
The MoS_2/graphene composite material was prepared in situ through hydrothermal process using graphene oxide, sodium molybdate, thioacetamide and glucose as precursors. The morphologies and structural characteristics of the MoS_2/graphene composite were studied by SEM, XRD and XPS. The electrochemical properties of MoS_2/g raphene composite were evaluated by cyclic voltammetry and galvanostatic charge-discharge test using MoS_2//Li half-cells. The first cycle discharge and charge capacity of MoS_2/graphene composite were 863 and 717 mAh/g,respectively. After 200 cycles, the MoS_2/graphene composite can retain a relatively high specific capacity of 432 mAh/g.
引文
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[4] FAN X, GADDAM R R, KUMAR N A, et al. A hybrid Mg2+/Li+battery based on interlayer-expanded MoS2/graphene cathode[J].Advanced Energy Materials, 2017, 7(19):1700317.
[5] TAN Y H, ZHOU F, HUANG Z H, et al. Mo S2-nanosheet-decorated carbon nanofiber composites enable high-performance cathode materials for Mg batteries[J]. ChemElectroChem,2018, 5(7):996-1001.
[6] WU H, HOU C, SHEN G, et al. MoS2/C/C nanofiber with doublelayer carbon coating for high cycling stability and rate capability in lithium-ion batteries[J]. Nano Research, 2018(1):1-13.
[7] WANG H, JIANG H, HU Y, et al. 2D Mo S2/polyaniline heterostructures with enlarged interlayer spacing for superior lithium and sodium storage[J]. Journal of Materials Chemistry A, 2017, 5(11):5383-5389.