fig2

Figure 2. SEM images of (A) HCl-treated melamine/ Ti₃C₂T_x precursor and (B) 3D N-Ti₃C₂T_x, (C-F) TEM, and (G) STEM images of 3D N-Ti₃C₂T_x with corresponding elemental mappings of C, Ti, and N. Scale ba rs: 200 nm.