Hydrogen Fuel Viability

It's a storage issue. Storing a useful quantity of hydrogen is very difficult.

Why hydrogen? Aren't fuel-cells are notoriously low density storage medium for power?

Isn't Hydrogen fuel less efficient and expensive?

Negative. But storing liquid H2 is hard, vs (CH2)n. Carrying around O2 and Propane is easier than putting a nuke on wheels.

Hydrogen almost certainly won't go anywhere, in my opinion.* The efficiency compared to battery tech is horrendous.* Hydrogen is effectively a storage technology -- we have to generate it and compress it. Which combined with the above means that charging a hydrogen car will always be more expensive than putting the same amount of usable energy into a battery powered car.* Let's not forget that the cheapest way of generating hydrogen is from fossil fuels. Electrolysis is very i

How efficient is hydrogen as an energy storage medium compared to e.g. Li-Ion batteries?

Most of the problems with hydrogen for cars comes from how you produce that hydrogen.Obviously, producing hydrogen from methane to power cars is a stupid idea if your goal is to reduce greenhouse gases.However, pure electric cars are only successful in some niches, and larger vehicles like buses and lorries just aren't practical yet, whilst hydrogen buses are already a thing. Battery technology has come a long way, but the energy density is still absolute garbage when you compare it t

Hydrogen has been mooted as an alternative fuel as long as I remember (40 odd years). The fact there is barely any Hydrogen infrastructure (and hence, barely any cars) by this point, while there are plenty of electric cars suggests there are a lot more problems with Hydrogen than you might imagine. Yes, there are problems with EVs. But they seem to work for the here and now, and are certainly better than staying with oil.

Hydrogen is a less efficient energy store than a battery, requires high pressure systems, leaks are dangerously explosive, distributing it is more difficult than petrol or electricity. It has applications, but in general, its often significantly worse than any other greener alternative.

I think it'll fizzle out. Hydrogen has too many disadvantages. Storage is difficult. Hydrogen will diffuse through most materials. Hydrogen can't be sensed by people, so you need special sensors throughout the vehicle and any filling stations. It burns with an almost invisible flame, and it burns in a very wide range of air/fuel mixtures. It's far more flammable than gasoline. You have to build out completely new infrastructure (unlike EVs that only require improving the capa