Abstract
<h2>Summary</h2> Porous Cu/Ni foils were made by electroplating Ni on Cu foils and used as templates for chemical vapor deposition growth of porous graphene foam. The walls in the graphene foam were found to be two to five graphene layers thick, interconnected to form a low-density porous network with a wide distribution of pore sizes and a high electrical conductivity. A comprehensive comparison with previously studied materials for electromagnetic interference (EMI) shielding showed that this graphene foam is among the best EMI shielding materials; its specific EMI shielding effectiveness (>720 dB cm<sup>3</sup> g<sup>−1</sup>) and absolute effectiveness (>45,000 dB cm<sup>2</sup> g<sup>−1</sup>) are superior to those of most other materials. This graphene foam has a large absorption capacity for various organic solvents and oils and adsorbs them within seconds. The synthesis strategy should provide a general approach for generating other 3D porous structures, including those based on a variety of known 2D materials, for various applications.
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