fig7

Figure 7. (A) SEM and HRTEM image of AC-HC-1000, and nitrogen adsorption/desorption isotherms of AC-HC samples prepared at three different temperatures with corresponding pore-size distribution curves^[85]. Copyright 2020, American Chemical Society; (B) SEM and HRTEM image of NHC, and N2 adsorption and desorption isotherms of NHC with corresponding pore distribution^[86]. Copyright 2021, Wiley; (C) SEM and HRTEM image of NCFs, and N2 adsorption and desorption isotherms of NCFs with corresponding pore distribution^[73]. Copyright 2017, Elsevier; (D) SEM and HRTEM image of HC-1300, and N2 adsorption and desorption isotherms of HC-1300 with corresponding pore distribution^[64]. Copyright 2024, Wiley. E, SEM, TEM and HRTEM image of NCM, and N2 adsorption and desorption isotherms of NCM with corresponding pore distribution^[69]. Copyright 2021, Elsevier. HRTEM: High-resolution transmission electron microscopy; AC-HC: nanosheet hard carbon; NCFs: N-doped carbon nanofibers; SEM: scanning electron microscope; TEM: transmission electron microscope; NCM: N-doped amorphous carbon/graphite coupled polyhedral microframe.