fig3

Figure 3. (A) Schematic illustration of the Ti₃C₂T_x modified by the amino acids. (B) XRD patterns of the Co-Ti₃C₂T_x-Ser, Co-Ti₃C₂T_x-Lys, Co-Ti₃C₂T_x-Arg, and Mul-Ti₃C₂T_x composites. (C) Raman spectra of the Co-N@Ti₃C₂T_x-Ser, Co-N@Ti₃C₂T_x-Lys, Co-N@Ti₃C₂T_x-Arg, and Mul-Ti₃C₂T_x composites from 0 to 3,250 cm^-1. (D) C 1s XPS spectrum of the crumpled Co-N@Ti₃C₂T_x-Arg composite. (E) O 1s spectrum of the Co-N@Ti₃C₂T_x-Arg composite. (F) Co 2p spectrum of the Co-N@Ti₃C₂T_x-Arg composite. (G) N 1s spectrum of the Co-N@Ti₃C₂T_x-Arg composite. (H) Ti 2p spectrum of the Co-N@Ti₃C₂T_x-Arg composite.