fig1

Figure 1. (A) Schematics of the synthesis of the Mo₂Ti₂C₃T_x, Mo₂TiC₂T_x, and Mo₂CT_x MXenes. (B) XRD patterns of the Mo₂Ti₂C₃T_x, Mo₂TiC₂T_x, and Mo₂CT_x MXenes and their corresponding MAX phases (Mo₂Ga₂C, Mo₂TiAlC₂, and Mo₂Ti₂AlC₃). (C) TEM single-flake image and SAED pattern of the Mo₂Ti₂C₃T_x. (D) XPS survey spectrum of the Mo₂Ti₂C₃T_x, Mo₂TiC₂T_x, and Mo₂CT_x MXenes. (E) deconvoluted Mo 3d spectra of the Mo₂Ti₂C₃T_x, Mo₂TiC₂T_x, and Mo₂CT_x. (F) Composition comparison of fluorine termination on the Mo₂Ti₂C₃T_x, Mo₂TiC₂T_x, and Mo₂CT_x. (G) Digital photograph and cross-sectional SEM image of the Mo₂Ti₂C₃T_x electrode coated on Cu substrate. (H) Schematics of the fabrication of the Mo₂Ti₂C₃T_x, Mo₂TiC₂T_x, Mo₂CT_x, and bare Cu electrodes, and the effect of the electrode on the Li deposition at different current densities, with emphasis on the in-situ formation of a Li₂CO₃/LiF-rich SEI layer on the electrode.