Porous Two-Dimensional Transition Metal Carbide (MXene) Flakes for High-Performance Li-Ion Storage
Porous Two-Dimensional Transition Metal Carbide (MXene) Flakes for High-Performance Li-Ion Storage
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DOI：
10.1002/celc.201600059
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发表时间：
2016-05-01
期刊：
影响因子：
4
通讯作者：
Gogotsi, Yury
中科院分区：
文献类型：
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作者：
Ren, Chang E.;Zhao, Meng-Qiang;Gogotsi, Yury
在此，我们开发了一种化学蚀刻方法，在室温下在水溶液中制备多孔二维（2D） Ti3C2Tx MXenes。制备的多孔Ti3C2Tx （p-Ti3C2Tx）比原始Ti3C2Tx具有更大的比表面积和更开放的结构，并且可以在添加碳纳米管（CNTs）或不添加碳纳米管（CNTs）的情况下制成柔性薄膜。与原始Ti3C2Tx薄膜相比，制备的p-Ti3C2Tx/CNT薄膜具有显著提高的锂离子存储能力，在0.1 C时具有接近1250 mAhg（-1）的高容量，出色的循环稳定性和良好的倍率性能（在10 C时为330 mAhg(-1)）。采用相同的化学蚀刻方法，我们还制备了多孔Nb2CTx和V2CTx MXenes。因此，这项研究提供了一种简单而有效的方法，可以在MXenes和其他2D薄片中引入孔隙，从而提高它们的电化学性能。
Herein we develop a chemical etching method to produce porous two-dimensional (2D) Ti3C2Tx MXenes at room temperature in aqueous solutions. The as-produced porous Ti3C2Tx (p-Ti3C2Tx) have larger specific surface areas and more open structures than their pristine counterparts, and can be fabricated into flexible films with, or without, the addition of carbon nanotubes (CNTs). The as-fabricated p-Ti3C2Tx/CNT films showed significantly improved lithium ion storage capabilities compared to pristine Ti3C2Tx based films, with a very high capacity of approximate to 1250 mAhg(-1) at 0.1 C, excellent cycling stability, and good rate performance (330 mAhg(-1) at 10 C). Using the same chemical etching method, we also made porous Nb2CTx and V2CTx MXenes. Therefore, this study provides a simple, yet effective, procedure to introduce pores into MXenes and possibly other 2D sheets that in turn, can enhance their electrochemical properties.