fig2

Figure 2. (A-F) SEM images; (G-I) HRTEM images; (J-M) EDS mappings of 0.46-AFR-HC, the (K), (L), and (M) figures belong to the EDS mappings of C, N and O elements respectively. SEM: Scanning electron microscopy; HRTEM: high-resolution transmission electron microscope; EDS: Energy dispersive spectrometer; AFR: aminophenol formaldehyde resin; HC: hard carbon.