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Fluorine‐Free Synthesis of High‐Purity Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> (T=OH, O) via Alkali Treatment

Tengfei LiState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 ChinaLulu YaoState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 ChinaQinglei LiuState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 ChinaJiajun GuState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 ChinaRuichun LuoSchool of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 ChinaJinghan LiState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 ChinaXudong YanState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 ChinaWeiqiang WangState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 ChinaPan LiuSchool of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 ChinaBin ChenSchool of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 ChinaWang ZhangState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 ChinaWaseem AbbasState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 ChinaRaheela NazState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 ChinaDi ZhangState Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China
2018en
ABI

Annotatsiya

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 Ti 3 C 2 T x (T=OH, O). This route is inspired from a Bayer process used in bauxite refining. The process is free of fluorine and yields multilayer Ti 3 C 2 T x with ca. 92 wt % in purity (using 27.5 m NaOH, 270 °C). Without the F terminations, the resulting Ti 3 C 2 T x 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 H 2 SO 4 . This surpasses (by ca. 214 %) that of the multilayer Ti 3 C 2 T x 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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DOI
10.1002/anie.201800887

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