▎ 摘　　要

NOVELTY - A graphene-silicon-based aerogel is formed by covalently crosslinking and fully recovering the original size of double network structure under strain of less than or equal to 50%, and has a density of greater than or equal to 4.6 mg/m3, a specific surface area of greater than 75.3 m2/g and a contact angle of greater than 128degrees. USE - The graphene-silicon-based aerogel is useful in environmental remediation, energy storage and conversion, thermal management, sensor and electromagnetic wave absorption application. ADVANTAGE - The graphene-silicon-based aerogel forms double network structure through covalent crosslinking, has ultra-low density, and excellent flexibility, versatility, hydrophobicity and compression resilience performance due to its unique network structure, excellent thermal insulation performance in high humidity and high temperature environment, and high-efficiency adsorption performance and oil-water separation performance for oil or organic solvent, and can be produced with high efficiency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the graphene-silicon-based aerogel, which involves: (S1) weighing hexadecyltrimethylammonium bromide powder, methyltrimethoxysilane and gamma-aminopropyldiethoxymethylsilane, stirring and uniformly mixing to obtain mixed solution (A); (S2) titrating solution (A) into a graphene oxide aqueous solution added with a sodium hydroxide solution under an ice bath condition, uniformly stirring, transferring to a container, placing in an oven at 95degrees Celsius for sealing and storing for 3 days to obtain reduced graphene oxide-based hydrogel; (S3) aging the graphene-based hydrogel, freezing at -20degrees Celsius to -80degrees Celsius for 12-24 hours, taking out the graphene-based hydrogel, and drying in a freeze dryer for 12-72 hours to obtain reduced graphene oxide-based aerogel; and (S4) heating the aerogel at a heating rate of 3degrees Celsius/minute to 300degrees Celsius, heat-preserving for 10 hours in a protective atmosphere, and then naturally cooling.