3 years ago

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

Achieving high-rate capacitance of multi-layer titanium carbide (MXene) by liquid-phase exfoliation through Li-intercalation
The stacks of multi-layer Ti3C2 T x 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 Ti3C2 T x interlayers in isopropyl alcohol (IPA) with LiOH as intercalant. This de-intercalation method presented here not only effectively delaminates the stacked Ti3C2 T x multi-layers into separate few-layer MXene sheets, but also achieves high-rate supercapacitive performance of Ti3C2 T x electrode. The as-produced delaminated Ti3C2 T x shows highly improved electrochemical capacitive properties from 47 to 115Fg1 at 200mVs1. Even at extremely high scan rate of 1000mVs1, a specific capacitance of 82Fg1 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.

Publisher URL: www.sciencedirect.com/science

DOI: S1388248117301340

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