In-depth information about the Hydrogen storage research:
The hydrogen is stored inside the liquid hydrogen carriers via a catalytic reaction. The liquid now has a low viscosity and looks like water. After the hydrogenation the viscosity has increased, and the liquid looks like honey. When loaded with hydrogen, this LOHC is flame-retardant, which makes it a safe transport medium for hydrogen to the location of use where the hydrogen can be unloaded from this carrier liquid.
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The loaded LOHC can be stored at ambient conditions, which is (another) advantage over gaseous hydrogen. This loading/unloading is a reversible process; hydrogenation (loading) requires higher pressures, is exothermal and therefore releases energy, whereas dehydrogenation (unloading) is an endothermal process which requires energy and therefore higher temperatures - both catalyst-driven.