A Novel Hierarchically Lightweight Porous Carbon Derived from Egg White for Strong Microwave Absorption  

作　　者：Zonglin Liu Xu Zhao Liangliang Xu Qingyu Peng Xiaodong He 

机构地区：[1]National Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Center for Composite Materials and Structure,Harbin Institute of Technology,Harbin 150080,China

出　　处：《Engineering》2022年第11期161-172,共12页工程（英文）

基　　金：Supported by the Fundamental Research Funds for the Central Universities and Heilongjiang Provincial Natural Science Foundation of China(YQ2020E009)。

摘　　要：Egg custard is a common dish on the dining table and exhibits a uniform porous structure after freezedrying.The protein within egg custard is a rich source of carbon and nitrogen,and the custard’s unique microstructure and adjustable electrical properties make it a potential porous carbon precursor.Herein,nitrogen in situ doped porous carbons(NPCs)and potassium-carbonate-modified NPCs(PNPCs)are obtained through a simple gelation and carbonization process using egg white as the raw material.The unique morphologies of the porous carbon are inherited from the protein and include fibrous clusters,honeycomb holes,and a grooved skeleton.Their excellent impedance matching and effective internal loss make the obtained porous carbons good candidates for lightweight electromagnetic(EM)wave absorbers without the need to dope with metal elements.As a representative porous carbon,PNPC10-700 has multiple structures,including fibrous clusters,honeycomb holes,and a porous skeleton.Moreover,it achieves a maximum reflection loss value of-66.15 dB(with a thickness of 3.77 mm)and a broad effective absorption bandwidth of 5.82 GHz(from 12.18 to 18.00 GHz,with a thickness of 2.5mm),which surpasses the reported values in most of the literatu re.Thus,gelation combined with the further carbonization of egg white(protein)is a new method for designing the morphology and EM properties of porous carbon absorbers.

关 键 词：Microwave absorption Porous carbon BIOMASS K2CO3 

分 类 号：TQ127.11[化学工程—无机化工]