fig2

Figure 2. SEM images of the (A and B) multilayer Ti₃C₂T_X, (C-E) Ti₃C₂T_X-Ser, and Ti₃C₂T_X-Lys, and Ti₃C₂T_x-Arg, composites; (F-J) SEM image and EDS spectrum mapping: C, Co, and N elemental distribution of the Co-N@Ti₃C₂T_x-Arg composite.