Metal-organic frameworks (MOFs) are fairly recent inventions, but I have written about them before, just not in this context. These materials are composites of molecules that are very good at absorbing gases, and my previous post involved carbon dioxide.
As you can tell from the title, this paper is about hydrogen storage. Although MOFs weight generally precludes them from being used in hydrogen fuel-cell electric vehicles, there are many hydrogen storage applications for which they are a perfect fit.