The work we and the NRL are doing is chemically adding hydrogen to graphite (to make graphane, a solid). It can then be released (as a gas) by heating. This is classified as "solid state hydrogen storage." The hydrogen gas released from the graphane is then fed directly to a fuel cell where it reacts with oxygen to release energy for use. Hydrogen is the "fuel".
We are talking about more efficient hydrogen storage for fuel cells. Hydrogen stored this way is much much more compact (takes up much less volume) than storing it as a compressed gas and it does not have to be kept under high pressure or at low temperatures.
To learn more and request a sample for your hydrogen fuel cell research: https://xlynxmaterials.com/request-graphane-sample/