Fluorine‐Free Synthesis of High‐Purity Ti3C2Tx (T=OH,O) via Alkali Treatment |
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| Authors: | Dr Tengfei Li Dr Lulu Yao Prof Qinglei Liu Prof Jiajun Gu Dr Ruichun Luo Dr Jinghan Li Dr Xudong Yan Dr Weiqiang Wang Prof Pan Liu Prof Bin Chen Prof Wang Zhang Dr Waseem Abbas Dr Raheela Naz Prof Di Zhang |
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| Institution: | 1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China;2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China |
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| Abstract: | MXenes, 2D compounds generated from layered bulk materials, have attracted significant attention in energy‐related fields. However, most syntheses involve HF, which is highly corrosive and harmful to lithium‐ion battery and supercapacitor performance. Here an alkali‐assisted hydrothermal method is used to prepare a MXene Ti3C2Tx (T=OH, O). This route is inspired from a Bayer process used in bauxite refining. The process is free of fluorine and yields multilayer Ti3C2Tx with ca. 92 wt % in purity (using 27.5 m NaOH, 270 °C). Without the F terminations, the resulting Ti3C2Tx film electrode (ca. 52 μm in thickness, ca. 1.63 g cm?3 in density) is 314 F g?1 via gravimetric capacitance at 2 mV s?1 in 1 m H2SO4. This surpasses (by ca. 214 %) that of the multilayer Ti3C2Tx prepared via HF treatments. This fluorine‐free method also provides an alkali‐etching strategy for exploring new MXenes for which the interlayer amphoteric/acidic atoms from the pristine MAX phase must be removed. |
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| Keywords: | hydrothermal synthesis MXenes supercapacitors titanium two-dimensional materials |
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