Self-assembling flexible 2D carbide MXene film with tunable integrated electron migration and group relaxation toward energy storage and green EMI shielding
Self-assembling flexible 2D carbide MXene film with tunable integrated electron migration and group relaxation toward energy storage and green EMI shielding
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自组装柔性 2D 碳化物 MXene 薄膜，具有可调谐集成电子迁移和基团弛豫，可实现能量存储和绿色 EMI 屏蔽
DOI：
10.1016/j.carbon.2019.10.009
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发表时间：
2020-02-01
期刊：
影响因子：
10.9
通讯作者：
Yuan, Jie
中科院分区：
文献类型：
--
作者：
He, Peng;Cao, Mao-Sheng;Yuan, Jie
分层Ti 3C 2 Tx（D-Ti 3C 2 Tx）MXene薄膜具有优异的电化学和电磁干扰（EMI）屏蔽性能。然而，D-Ti 3C 2 Tx纳米片的产率低、易氧化等缺点限制了其商业化应用。本文采用过滤辅助自组装技术成功制备了绿色柔性多层Ti 3C 2 Tx/羟乙基纤维素（M-Ti 3C 2 Tx/HEC）复合薄膜。该薄膜作为储能器件的电极材料显示出良好的循环性能，这主要归因于HEC与M-Ti 3C 2 Tx键合的互连结构的构建。在充放电过程中，电子迁移和表面基团起着重要的作用。同时，该膜显示出优异的EMI屏蔽性能。特别是，介电损耗分析表明，进入薄膜的电磁波主要以电子迁移引起的热能的形式耗散。多层叠层的屏蔽效果表明，随着叠层厚度的减小，薄膜呈现出以吸收为主的绿色电磁屏蔽的趋势。该研究为加快MXene储能材料的应用和绿色电磁屏蔽材料的开发提供了新的思路。(C)2019爱思唯尔有限公司版权所有。
Delaminated Ti3C2Tx (D-Ti3C2Tx) MXene films exhibit excellent electrochemical and electromagnetic interference (EMI) shielding performance. However, the low yield and easy oxidation of D-Ti3C2Tx nanosheet limit its commercial application. Herein, the flexible green multilayered Ti3C2Tx/hydroxyethyl cellulose (M-Ti3C2Tx/HEC) composite film was successfully fabricated through the filtration assisted self-assembly of M-Ti3C2Tx together with HEC. The film shows good cyclability as electrode materials for energy storage devices, which is mainly attributed to the construction of interconnected structures, where HEC was bonded to M-Ti3C2Tx. The electron migration and surface group play important roles in the process of charging and discharging. Meanwhile, the film shows excellent EMI shielding performance. Especially, dielectric loss analysis indicates that EM waves entering the film are mainly dissipated in the form of heat energy caused by electron migration. The effect of multilayer stacking indicates that the film present the trend of absorption-dominate green EMI shielding with the decrease of the stacking thickness. This work will provide new ideas for accelerating the utilization of the MXene-based energy storage and green EMI shielding materials. (C) 2019 Elsevier Ltd. All rights reserved.