Wenbin Lin of the University of North Carolina and colleagues at the United States Department of Energy have developed a prototype material to drive the hydrogen economy forward. The crystalline organo-zinc compound, based on a network of aromatic rings, can trap hydrogen molecules within its highly porous structure. The material can store more than 1% by total weight of hydrogen and release it again. The material's storage efficiency boils down to the interlocking grid of aromatic groups explains Lin. Safe and efficient hydrogen storage materials will be essential to powering vehicles using fuel cells.