▎ 摘　　要

Mass production of high-quality graphene and its assemblies is a key step for practical application of graphene in many fields. Herein, a facile and ultrafast microwave reduction process with the aid of catalytic pre-reduction at room temperature is reported towards the preparation of high-quality graphene foam. The catalytic pre-reduction aided microwave method enables an efficient reduction process within a few seconds, whilst the original architecture of three-dimensional graphene foam remains, along with a superhigh C/O ratio (31.3), low lattice defects, and significant electrical conductivity (50,000 S/m) as well as excellent dispersibility and processability. Due to the intrinsic structure advantages of MW-H-GF, when applied to electromagnetic shielding, it could deliver a shielding efficiency of around 50 dB in the low frequency region while 70 dB in the high frequency region, indicating excellent electromagnetic shielding performance. Furthermore, MW-H-GF also demonstrated remarkable oil adsorption capacity which can reach an adsorption capacity of 480 times chloroform of the self-weight.