碱金属
MXenes公司
氟
重量分析
化学
热液循环
水热合成
材料科学
电极
蚀刻(微加工)
微型多孔材料
锂(药物)
分析化学(期刊)
无机化学
化学工程
核化学
纳米技术
物理化学
冶金
有机化学
图层(电子)
复合材料
内分泌学
工程类
医学
作者
Tengfei Li,Lulu Yao,Qinglei Liu,Jiajun Gu,Ruichun Luo,Jinghan Li,Xudong Yan,Weiqiang Wang,Mingwei Chen,Bin Chen,Wang Zhang,Waseem Abbas,Raheela Naz,Di Zhang
标识
DOI:10.1002/anie.201800887
摘要
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 Ti3 C2 Tx (T=OH, O). This route is inspired from a Bayer process used in bauxite refining. The process is free of fluorine and yields multilayer Ti3 C2 Tx with ca. 92 wt % in purity (using 27.5 m NaOH, 270 °C). Without the F terminations, the resulting Ti3 C2 Tx 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 H2 SO4 . This surpasses (by ca. 214 %) that of the multilayer Ti3 C2 Tx 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.
科研通智能强力驱动
Strongly Powered by AbleSci AI