 The study presents the preparation of cellulose carbon aerogel at reduced graphene oxide aerogels, CCA at Argeo, and their use as an effective electromagnetic interference, EMI, shielding material and lightweight, flexible composites. The CCA at Argeo-slash-polydomethylsiloxane, PDMS, composites have excellent EMI shielding effectiveness of 51 dB, which is 3.9 times higher than that of coblended CCA-slash-Argeo-slash PDMS composites with the same loading of fillers. The CCA at Argeo-slash-PDMS composites also exhibit good thermal stability and high thermal conductivity coefficient, making them a promising material for EMI shielding applications. This article was authored by Ping Song, Bei Lu, Chao Boil Yang, and others.