Abstract
A highly efficient absorber with features including lightweight,broad bandwidth,and tunable elec-tromagnetic property still remains challenging for practical applications.Herein,the Porphyra-derived porous carbon(PPC)was fabricated via facile procedures of low-temperature pre-carbonization combined with KOH chemical activation.The composition,microstructure,and electromagnetic wave absorption properties of the samples were elucidated based on X-ray diffraction(XRD),Raman,X-ray photoelec-tron spectroscopy(XPS),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Brunauer-Emmer-Teller(BET),and vector network analyzer(VNA).The porosity of PPC can be readily regulated by adjusting activation temperature.The PPC obtained at 750℃was composed of a three-dimensional hierarchically porous carbon network.The C and N elements of natural Porphyra were intro-duced into the carbon skeleton during the carbonization process.The large specific surface,dopants,and three-dimensional hierarchically porous carbon network can effectively improve the impedance matching and dielectric dissipation,leading to an excellent electromagnetic wave absorption performance.Espe-cially,the optimal reflection loss(RL)value reached-57.75 dB at 9.68 GHz with a broad bandwidth(RL＜-10 dB)value of 7.60 GHz at 3.5 mm.Overall,the results indicate that the PPC can provide a new way to achieve lightweight,effective,and sustainable absorbers.
基金项目
国家自然科学基金(52173267)
Open Fund of National&Local Joint Engineering Research Center for Mineral Salt Deep Utilization(SF201902)
NETL
NSTL
维普
万方数据