Achieving high-rate capacitance of multi-layer titanium carbide (MXene) by liquid-phase exfoliation through Li-intercalation

作者：Wang, Hongbing; Zhang, Jianfeng^*; Wu, Yuping; Huang, Huajie; Jiang, Quanguo

来源：Electrochemistry Communications, 2017, 81: 48-51.

DOI：10.1016/j.elecom.2017.05.009

• Electrochemical capacitors
• Two-dimensional materials
• Titanium carbide
• MXene
• Intercalation
• Exfoliation

The stacks of multi-layer Ti3C2Tx and other types of MXene materials limit their electrochemical performance. Herein, we report a facile exfoliation technique to improve the exfoliation efficiency through Li-intercalation into Ti3C2Tx interlayers in isopropyl alcohol (IPA) with LiOH as intercalant. This de-intercalation method presented here not only effectively delaminates the stacked Ti3C2Tx multi-layers into separate few-layer MXene sheets, but also achieves high-rate supercapacitive performance of Ti3C2Tx electrode. The as-produced delaminated Ti3C2Tx shows highly improved electrochemical capacitive properties from 47 to 115 Fg(-1) at 200 mV s(-1). Even at extremely high scan rate of 1000 mV s(-1), a specific capacitance of 82 Fg(-1) is still obtained. The high-rate capability can be attributed to improved ions accessibility into the few-layer structures. This study offers a new and simple exfoliation pathway for MXenes materials to exploit their full potential in energy storage applications.

• 出版日期2017-8
• 单位南京工程学院; 河海大学