Monolayer Ti3C2Tx Nanosheets with Different Lateral Dimension: Preparation and Electrochemical Property

doi:10.15541/jim20190088

Abstract

Abstract:

Recently, a new type of 2D transition metal carbides or nitrides (MXene) has attracted wide attention due to its large specific surface area, good hydrophilicity, metallic conductivity and other physical and chemical properties. 2D Ti₃C₂T_x MXene was obtained by etching Al layer of Ti₃AlC₂ with LiF and HCl and then mechanically delaminated. And the monolayer Ti₃C₂T_x nanosheets with lateral dimension of 625 and 2562 nm can be prepared by changing the intensity and way of mechanically delamination, as well as the centrifugation rate and time. Then their morphology, structure, composition, and electrochemical performance of Ti₃C₂T_x were studied. The results showed that the specific capacitance of Ti₃C₂T_x with smaller lateral size (<1 μm) can reach 561.9 F/g, higher than that of reported graphene, carbon tube and MnO₂ in the repotted literatures. And the Ti₃C₂T_x electrode still remained 96% of the initial specific capacitance after 10 ⁴ testing cycles.

Key words: 2D materials, Ti₃C₂T_x, controllable preparation, chemical etching, supercapacitor

CLC Number:

TQ174

MA Ya-Nan, LIU Yu-Fei, YU Chen-Xu, ZHANG Chuan-Kun, LUO Shi-Jun, GAO Yi-Hua. Monolayer Ti₃C₂T_x Nanosheets with Different Lateral Dimension: Preparation and Electrochemical Property[J]. Journal of Inorganic Materials, 2020, 35(1): 93-98.

Figures/Tables 5

Fig. 1 Schematic diagram of preparation of Ti3C2Tx nanosheets

Fig. 2 (a-b) TEM images of smaller and larger size Ti3C2Tx nanosheets with insets showing corresponding diffraction pattern, and (c) AFM image with its height profile of Ti3C2Tx

Fig. 3 (a-b) Diameter distribution of smaller and larger size Ti3C2Tx nanosheets; (c) XRD patterns of Ti3AlC2 and Ti3C2Tx nanosheets with black line indicating Ti3AlC2, red line indicating larger size Ti3C2Tx, and blue line indicating smaller size Ti3C2Tx; (d) I-V curves of smaller and larger size Ti3C2Tx with black line indicating larger size Ti3C2Tx and red one indicating smaller size Ti3C2Tx

Fig. 4 (a) CV curves of smaller and larger size Ti3C2Tx at 20 mV/s; (b) GCD curves of smaller and larger size Ti3C2Tx at 1 A/g; (c) Specific capacity of smaller and larger size Ti3C2Tx at different scanning rates; (d) EIS (Nyquist plots) for smaller and larger size Ti3C2Tx from 5 mHz to 100 kHz

Fig. 5 (a-b) CV curves of smaller size Ti3C2Tx; (c) GCD curves of smaller size Ti3C2Tx; (d) Cyclic stability of smaller size Ti3C2Tx

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Monolayer Ti₃C₂T_x Nanosheets with Different Lateral Dimension: Preparation and Electrochemical Property

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