Fig. 2: Mechanism of Lewis-basic halides treatment.
From: Simultaneously tuning interlayer spacing and termination of MXenes by Lewis-basic halides
a–c Substance component of AlBr3/NaBr/KBr molten salt with different percentages of AlBr3 inside. a There is only AlBr3 molecular in pure molten state AlBr3 salt (100 mol% AlBr3). b For AlBr3/NaBr/KBr with more than 50 mol% AlBr3, [Al2Br7]−, [AlBr4]− ions in equilibrium with aluminum bromide (in the form of Al2Br6 and AlBr3) are present with less desolvated Na+ and K+. c For AlBr3/NaBr/KBr with less than 50 mol% AlBr3, abundant desolvated Br−, Na+, and K+ exist in molten salts (light green balls: potassium, blue balls: sodium, cyan balls: bromine, silver ball: aluminum). d, e XRD patterns and high-resolution Br 3d XPS spectrum of LB-Ti3C2Tx treated by AlBr3/NaBr/KBr molten salts with different component ratios. f The variation trend of the content of Br termination and interlayer spacing of LB-Ti3C2Tx after treatment by AlBr3/NaBr/KBr molten salts with different component ratios. The fitted blue curve follows: y1=−0.065x1+6.60. The fitted red curve follows: y2=201028.25*\({{{\mbox{e}}}}^{\left(\frac{{{\mbox{-}}}{{{\mbox{x}}}}_{2}}{4{{\mbox{.}}}421}\right)}\)+0.88. Source data are provided as a Source Data file.
