Porous heterostructured MXene/carbon nanotube composite paper with high volumetric capacity for sodium-based energy storage devices
Porous heterostructured MXene/carbon nanotube composite paper with high volumetric capacity for sodium-based energy storage devices
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DOI：
10.1016/j.nanoen.2016.06.005
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发表时间：
2016-08-01
期刊：
影响因子：
17.6
通讯作者：
Gogotsi, Yury
中科院分区：
文献类型：
--
作者：
Xie, Xiuqiang;Zhao, Meng-Qiang;Gogotsi, Yury
钠的全球可用性和避免使用铜集流体的可能性使得电化学钠离子存储对于电池和金属离子电容器应用具有吸引力。然而，使用Na代替Li离子需要不同的电极材料，其可以容纳较大的Na离子并且仍然提供高充电速率和高体积容量。本文报道了用于钠基储能装置的多孔Ti 3C 2 MXene/CNT复合纸电极的制备。异质结构的形成是通过带负电荷的2D MXene纳米片和带正电荷的1D CNT之间的静电吸引来实现的。该方法有效地防止了MXene纳米片的重新堆叠，并产生了明确的多孔结构，从而促进了电解质传输和离子进入电极，并产生了用于钠离子储存的功能性MXene基电极。当用作钠离子存储的独立电极时，有序Ti 3 C2 MXene/CNTs多孔膜在20 mA g（-1）下表现出421 mA h cm（-3）的高体积容量、良好的倍率性能和优异的循环稳定性。还使用所制备的Ti 3C 2/CNTs阳极和Na0.44MnO2阴极组装了原型钠离子电池。多孔MXene/CNT复合材料的制造，使用简单的自组装，打开了大门，开发具有高体积容量的钠离子存储电极材料。(C)2016爱思唯尔有限公司版权所有
The global availability of sodium and a possibility to avoid the use of copper current collectors make electrochemical sodium-ion storage attractive for battery and metal-ion capacitor applications. However, the use of Na instead of Li ions requires different electrode materials that can accommodate larger Na ions and still provide high charging rate and high volumetric capacity. Herein we report on the fabrication of porous Ti3C2 MXene/CNT composite paper electrodes for sodium-based energy storage devices. The heterostructure formation was realized by electrostatic attraction between negatively charged 2D MXene nanosheets and positively charged 1D CNTs. This method efficiently prevented restacking of MXene nanosheets and produced a well-defined porous structure, thereby facilitating electrolyte transport and access of ions to the electrode and producing functional MXene-based electrodes for sodium-ion storage. When applied as freestanding electrodes for sodium-ion storage, the built-to-order Ti3C2 MXene/CNTs porous films showed high volumetric capacity of 421 mA h cm(-3) at 20 mA g(-1), good rate performances, and excellent cycling stability. Prototype sodium-ion cells were also assembled using the as-prepared Ti3C2/CNTs anode and Na0.44MnO2 cathode. The fabrication of porous MXene/CNT composites, using simple self-assembly, opens the door to developing electrode materials with high volumetric capacity for sodium-ion storage. (C) 2016 Elsevier Ltd. All rights reserved.