Absorbents with good impedance matching and outstanding loss capacity are of great significance in the field of electromagnetic wave absorption. Herein, S, Co co-doped porous carbon nanosheets (SCN) were synthesized via the pyrolysis of metal organic frameworks. By adjusting the ratio of metal ions to ligands, the microstructures of the SCN composites are changed. As an efficient absorbent, the porous SCN-16 composite displays superior electromagnetic wave absorption performance. The minimun reflection loss (RLmin) is -54.5 dB at 15.6 GHz with a thickness of 2.2 mm. The efficient absorption bandwidth is 6.88 GHz. The doped Co nanoparticles and porous carbon were produced to provide magnetic dielectric synergetic effect and heterogeneous interfaces, thereby improving their impedance. Besides, the doped S further generates more dipole polarization loss to enhance electromagnetic wave absorption. Therefore, this work not only provide an advanced strategy for the regulation of heterogeneous interfaces of SCN composites, but also induce a novel avenue to synthesize the S, Co co-doped porous carbon for the improved impedance matching and outstanding electromagnetic wave absorption. (C) 2020 Elsevier Inc. All rights reserved.