3D printing of hybrid MoS2-graphene aerogels as highly porous electrode materials for sodium ion battery anodes
3D printing of hybrid MoS2-graphene aerogels as highly porous electrode materials for sodium ion battery anodes
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DOI：
10.1016/j.matdes.2019.107689
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发表时间：
2019-05-15
影响因子：
8.4
通讯作者：
Li, Jun
中科院分区：
文献类型：
--
作者：
Brown, Emery;Yan, Pengli;Li, Jun
这项研究报告了一种3D冷冻打印方法，该方法集成了喷墨打印和冷冻铸造，通过在打印过程中形成冰微晶来控制微观结构和大孔隙率。在印刷过程中使用由与氧化石墨烯（GO）纳米片混合的分子MoS 2前体（硫代钼酸铵）组成的粘性水性油墨。通过冷冻干燥和还原热退火的后处理将印刷的中间体混合物转化为由在大孔框架中锚定在2D rGO纳米片表面上的MoS 2纳米颗粒组成的杂化结构，其完全用FESEM、TEM、XRD、拉曼光谱和TGA表征。研究了所得混合MoS 2-rGO气凝胶作为钠离子电池的阳极。它们在2.5-0.10 V（vs Na+/Na）的电位范围内以C/3.3倍率呈现超过429 mAh/g的高初始比容量。该过程涉及可逆的2 Na+插入和MoS 2向金属Mo的缓慢不可逆转化。在较高速率下，转化反应被抑制，并且电极由具有良好稳定性的快速Na+嵌入主导。这表明3D打印技术可以用作控制储能材料性能的加工技术。(C)2019作者爱思唯尔有限公司出版
This study reports a 3D freeze-printing method that integrates inkjet printing and freeze casting to control both the microstructure and macroporosity via formation of ice microcrystals during printing. A viscous aqueous ink consisting of a molecular MoS2 precursor (ammonium thiomolybdate) mixed with graphene oxide (GO) nanosheets is used in the printing process. Post-treatments by freeze-drying and reductive thermal annealing convert the printed intermediate mixture into a hybrid structure consisting of MoS2 nanopartides anchored on the surface of 2D rGO nanosheets in a macroporous framework, which is fully characterized with FESEM, TEM, XRD, Raman spectroscopy and TGA. The resulting hybrid MoS2-rGO aerogels are studied as anodes for sodium ion batteries. They present a high initial specific capacity over 429 mAh/g at C/3.3 rate in the potential range of 2.5-0.10 V (vs Na+/Na). The process involves both reversible 2 Na+ insertion and slow irreversible conversion of MoS2 to metallic Mo. At higher rates, the conversion reaction is suppressed and the electrode is dominated by fast Na+ intercalation with good stability. This demonstrates that the 3D printing technology can be used as a processing technique to control the materials properties for energy storage. (C) 2019 The Authors. Published by Elsevier Ltd.