Following in the theme of my ammonia posts, here's a new idea in hydrogen carriers as fuel for hydrogen fuel cells. It's from the Fraunhofer Institute, who call it powerpaste. It's basically magnesium hydride formulated in paste form. Add water and you get more hydrogen than you started with, the rest coming from the water.
Unlike ammonia, the residue doesn't vanish as air and water; it's basically milk of magnesia, and would need to be recycled in a power plant. But it has (according to them) ten times the energy density of a battery, so it's a viable automotive power source. So to refuel, you swap out cartridges.
Given that they are pushing it for mopeds, I'm guessing that the full-cycle efficiency isn't high, but one imagines that could be improved over time.
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