So far hydrogen is stored as a compressed gas or liquified. There is a lot of research around storing hydrogen in metal hydrides. The breakthrough described in the 5 July 2020 article in the Sydney Morning Herald from labs in Australia at University of New South Wales UNSW looks particularly promising and nearer term than many.
‘Alchemy of energy’: Breakthrough offers mass hydrogen storage options
by Bob Beth | Jul 4, 2020 | Green Hydrogen, Hydrogen Lab Advances, Syllabus | 0 comments