fig3

Figure 3. Morphology characterization. (A) Real-time temperature changes of samples heated by microwave pulses. The inset image is 10 s microwave discharge diagram; (B) SEM images of 2D P,N,S-Mo₂C; (C) TEM images of 2D P,N,S-Mo₂C; (D) The HRTEM image of 2D P,N,S-Mo₂C and the insert image is the corresponding SAED pattern; (E) EDS elemental mapping scanning from TEM of single doping 2D Mo₂C; (F) EDS elemental mapping scanning from TEM of binary doping 2D Mo₂C; (G) EDS elemental mapping scanning from TEM of ternary doping 2D Mo₂C. 2D: Two-dimensional; Mo₂C: molybdenum carbides; SEM: scanning electron microscopy; TEM: transmission electron microscopy; HRTEM: high-resolution transmission electron microscopy; SAED: selected area electron diffraction; EDS: energy-dispersive X-ray spectroscopy.