In-Situ Reduction of Nico Bimetal Anchored on Porous Straw-Derived Biochar Composites for Boosting Microwave Absorption Properties

As people's protection awareness about electromagnetic pollution is gradually increasing, the demand for absorbing materials with renewability and environmental friendliness has attracted widespread attention. In this paper, the straw-derived biochar combined with NiCo alloys were successfully fabricated in the process of high temperature reduction and hydrothermal reaction. The electromagnetic parameters of porous biocarbon/NiCo composites can be effective tuned by the NiCo content. The porous biocarbon/NiCo material possesses improved absorbing performance under the synergy effect of magnetic-dielectric characteristic that an exceptional reflection loss (RL) is -27.0 dB of 2.2 mm thickness and an effective absorption bandwidth is 4.42 GHz (11.71-16.13 GHz). Such results demonstrate that porous biocarbon/NiCo composite due to its advantages of low density, light weight, excellent conductivity, and strong absorption performance could be used as a new generation absorbing material