Three-dimensional(3D)carbon aerogel with high porosity and lightweight merit has emerged as an important high-performance electromagnetic(EM)absorption material.Despite great progress has been made,most reported 3D ca...Three-dimensional(3D)carbon aerogel with high porosity and lightweight merit has emerged as an important high-performance electromagnetic(EM)absorption material.Despite great progress has been made,most reported 3D carbon aerogels suffer from non-renewability and high cost.Moreover,the randomly distributed porous structure restricts the effective regulation of microwave absorption.Herein,the sustainable shaddock peel cellulose(SPC)was adopted to construct an ultralight and orientated carbon aerogel through a facile bidirectional freezing technique and subsequently thermal treatment process.The resultant carbon aerogel is composed of ordered lamellar layers interconnected by supported bridges,forming a continuous 3D conductive network.Addition of a small amount of graphene oxides(GO)nanosheets in biomass aerogel enhances the interaction of SPC and promotes electron transmission along 3D conductive network.Through tuning the lamellar spacing of aerogel,the as-prepared carbon aerogel achieves a remarkable microwave absorption property with a strong reflection loss(RL)of−63.0 dB and broad effective absorption bandwidth(EAB)of 7.0 GHz under ultralow filler content of 4 wt.%.Moreover,this carbon aerogel also demonstrates excellent thermal insulation property,and is even comparable to commercial products.The present work paves the way for designing low-cost and sustainable biomass-derived carbon aerogel for lightweight and high-performance microwave absorption and infrared stealth function.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52302110,52231007,52301236,12327804,T2321003,and 22088101)the Shanghai Pujiang Pro-gram(No.22PJ1401000)the“Start-up Fund”provided by Xi’an Technological University(No.0853/302020646).
文摘Three-dimensional(3D)carbon aerogel with high porosity and lightweight merit has emerged as an important high-performance electromagnetic(EM)absorption material.Despite great progress has been made,most reported 3D carbon aerogels suffer from non-renewability and high cost.Moreover,the randomly distributed porous structure restricts the effective regulation of microwave absorption.Herein,the sustainable shaddock peel cellulose(SPC)was adopted to construct an ultralight and orientated carbon aerogel through a facile bidirectional freezing technique and subsequently thermal treatment process.The resultant carbon aerogel is composed of ordered lamellar layers interconnected by supported bridges,forming a continuous 3D conductive network.Addition of a small amount of graphene oxides(GO)nanosheets in biomass aerogel enhances the interaction of SPC and promotes electron transmission along 3D conductive network.Through tuning the lamellar spacing of aerogel,the as-prepared carbon aerogel achieves a remarkable microwave absorption property with a strong reflection loss(RL)of−63.0 dB and broad effective absorption bandwidth(EAB)of 7.0 GHz under ultralow filler content of 4 wt.%.Moreover,this carbon aerogel also demonstrates excellent thermal insulation property,and is even comparable to commercial products.The present work paves the way for designing low-cost and sustainable biomass-derived carbon aerogel for lightweight and high-performance microwave absorption and infrared stealth function.
