It turns out that it's really hard to store large amounts of hydrogen in a stable form that can be released quickly in a light and small container. (theness.com)
The challenge now, scientists say, is to scale up the process to provide large amounts of hydrogen for various purposes, such as fueling vehicles or small generators. (sciencemag.org)
Research on a low cost and efficient way to obtain large amounts of hydrogen has been going on for some time now. (peakoil.net)