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I one worked with an engineer who knew about hydrogen fuel cell issues from his previous (highly specialized) projects. He mentioned the following concerns: -

by ekidd 5y ago

I one worked with an engineer who knew about hydrogen fuel cell issues from his previous (highly specialized) projects. He mentioned the following concerns: - Hydron has very low energy density per unit volume unless you compress it to many times atmospheric pressure. - Highly compressed hydrogen is a safety nightmare. Do we currently have hydrogen storage technologies that compare acceptably with modern batteries in terms of weight, size and catastrophic failure risks?

spurgu 5y ago
I saw a video by Physics Girl on Youtube a little while back going over Toyota's storage testing procedures (for crashes) and I remember being quite impressed. Quite complex/advanced tech though.
ephbit 5y ago
Low volumetric energy density of hydrogen is the reason why liquid fuels will likely be the energy carriers of the future in combination with fuel cells. Such as methanol.