Renewable Hydrogen, page-5

Hydrogen indeed appears to have many applications as a green energy source when sourced from renewables.

When considering hydrogen as an energy source for cars, there is the lower efficiency to consider when converting the renewable energy source to hydrogen for storage, and then when converting back to electricity for use in driving an electric motor. It seems that energy storage in Lithium batteries is more efficient then hydrogen at this time.

Here are a few links explaining it better that I can...

https://www.theengineer.co.uk/batteries-and-hydrogen-competing-npl/
Thermodynamics dictates that each time we convert energy between any of its forms we lose a fraction of this energy through irreversible heating of the system and its surroundings. Fortunately, the process of intercalation in a lithium ion battery is incredibly efficient (> 99%). This translates into a round-trip efficiency of around 70% for BEVs. Hydrogen fuel cells, on the other hand, have much lower efficiencies of around 60%, mainly due to losses associated with the oxygen reaction. When this is combined with the losses in producing the hydrogen from electrolysis in the first place, the round-trip efficiency of a FCEV drops to around 30%.

https://lithium-au.com/wp-content/uploads/2016/11/The-Power-of-3_ISSUE-26-1.pdf

https://www.furosystems.com/news/hydrogen-fuel-cells-vs-lithium-ion-batteries-in-electric-vehicles/
To conclude, hydrogen fuel cells offer a potentially very clean, energy-dense and easy to recharge energy source for vehicles and other systems, but are currently complicated, expensive and dangerous to operate. In comparison, Lithium-ion batteries, although less energy-dense and slower to recharge, are as clean, much cheaper, easier and safer to handle. More specifically, cylindrical lithium-ion cells like those used in the SIERRA and the FX are very stable and safe to use. In the future, once the technology is sufficiently developed and the drawbacks mentioned above addressed, hydrogen could be a great solution to increase range and decrease charging time in electric vehicles. But for now, lithium-ion technology is the best solution to offer very practical and high-performance e-bikes and other vehicles.