Preparation method of graphene aerogel with ultrahigh specific surface area

The invention discloses a preparation method of graphene aerogel with an ultrahigh specific surface area, and aims to enlarge the specific surface area of graphene aerogel without affecting the chemical structure of graphene. The preparation method comprises the following steps: taking graphite powder and siloxane as the main raw materials, preparing oxidized graphene, preparing a dispersion liquid of oxidized graphene, preparing silicon oxide hybridized graphene gel, drying the gel, and finally carrying out high-temperature decomposition to obtain the graphene aerogel with an ultrahigh specific surface area. The raw materials are mixed in liquid, after reactions, silicon oxide nano particles with an extremely small particle size can be evenly dispersed, thus the graphene is dispersed, and the agglomeration is prohibited. Furthermore, high-temperature decomposition is performed to remove the silicon oxide, at the same time the high-temperature decomposition has a certain activating effect, thus the prepared graphene aerogel has an ultrahigh specific surface area, which can reach 2491 m /g, and at the same time the chemical structure is barely influenced.