One-Pot Sintering Strategy for Efficient Fabrication of High-Performance and Multifunctional Graphene Foams.

Macroscopic three-dimensional (3D) graphene foams (GFs) were fabricated efficiently by immediately sintering low-temperature exfoliated graphene powder under inert atmosphere at the temperature over 500 °C. The one-pot sintering process not only integrated two-dimensional (2D) graphene sheets into 3D GF, but also accelerated the structural integrity of graphene by inducing its deoxygenation and repairing the defects. More importantly, the whole process could be finished within hours, usually less than 12 h, and the resultant GFs with interconnected graphene framework as well as meso- and macroporous structure exhibited exceptional attenuating performance for high-frequency electromagnetic interference and adsorption capacities for organic pollutants. In comparison with conventional hydro/solvothermal, sol-gel chemistry, sol-freezing, and templating methods, our sintering strategy possesses more advantages in maneuverability, efficiency, and repeatability, benefiting for the mass production of high-performance and multifunctional GFs.