Why only hydrogen is regarded as fuel of future and not other elements?

Question

I have basic idea of working of hydrogen fuel cell but why just hydrogen? Isn’t there any better or maybe cheaper alternative?
(I know it’s bit complex for but I would appreciate your answers)

In: 346

Answer 1

Hydrogen can be fused into helium to make massive amounts of energy, the mass of 2 hydrogen atoms is less than one helium atom so the extra mass is literally turned into energy

Literally how the sun makes its light. It’s a bonkers amount of energy Since it takes a lot of energy to make a small amount of mass

We have ludicrous amounts of hydrogen in our oceans, literally 2/3 of the water is hydrogen.

So if we can unlock fusion as something more than a science experiment, we can basically extract near limitless energy just from the water in the ocean.