Graphene nano box is a hydrogen suitcase that opens and shuts on demand.

The ultimate hydrogen power pack has been invented.  A one-atom-thick graphene surface has nine hinged panels that fold when goosed by an electric charge.  The panels fold with overlaps into a six-sided leak-proof cube brim-full of trapped hydrogen. The 3-D animation at the link is beautiful.  The University of Maryland research by mechanical engineers Shuze Zhu and Teng Li points the way to amazingly light and long-lasting fuel cells.   h/t to Instapundit linking to phys.org

From the animation: (Click on the link above, not the fake "start" symbol below.)