A versatile, ultralight, N-doped, 3D graphene framework (GF) is prepared. In their Communication on page 11371 ff., L. Qu and co-workers show that this GF has an ultra-low density ((2.1±0.3) mg cm−3; a GF block can balance on a dandelion) and its adsorption capacity for oils is much higher than that of the best carbonaceous sorbents. The 3D open-pore structure and N doping make GF promising as an electrode material for supercapacitors and as a metal-free catalyst for the oxygen reduction reaction in fuel cells.
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Zhao et al. (2012) studied this question.