A versatile N-doped honeycomb-like carbonaceous aerogels loaded with bimetallic sulfide and oxide for superior electromagnetic wave absorption and supercapacitor applications

Electromagnetic pollution and electrochemical energy consumption have driven enormous endeavors in electromagnetic wave absorption materials and energy storage devices, however, designing versatile composites for addressing the issue remains a huge challenge. Herein, a versatile honeycomb-like N-doped carbon/bimetallic sulfide and oxide (N–CoFe2O4-CoxSy/FexSy@C) composites aerogel was designed via a simple mechanical mixing, freeze-drying and heat treatment method. As-prepared N–CoFe2O4-CoxSy/FexSy@C composites exhibited excellent electromagnetic wave absorption and electrochemical performances. The minimum RL can reach −51.9 dB at 15.5 GHz, with an effective frequency bandwidth (RL